732 lines
15 KiB
C
732 lines
15 KiB
C
/*
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* UAE - The Un*x Amiga Emulator
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*
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* CIA chip support
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*
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* Copyright 1995 Bernd Schmidt, Alessandro Bissacco
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* Copyright 1996 Stefan Reinauer
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*/
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#include "shared.h"
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#include "events.h"
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#include "memory.h"
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#include "custom.h"
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#include "cia.h"
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#include "disk.h"
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#include "xwin.h"
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#include "keybuf.h"
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#include "gui.h"
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#define DIV10 5 /* Yes, a bad identifier. */
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/* battclock stuff */
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#define RTC_D_ADJ 8
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#define RTC_D_IRQ 4
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#define RTC_D_BUSY 2
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#define RTC_D_HOLD 1
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#define RTC_E_t1 8
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#define RTC_E_t0 4
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#define RTC_E_INTR 2
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#define RTC_E_MASK 1
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#define RTC_F_TEST 8
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#define RTC_F_24_12 4
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#define RTC_F_STOP 2
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#define RTC_F_RSET 1
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static UBYTE clock_control_d = RTC_D_ADJ + RTC_D_HOLD;
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static UBYTE clock_control_e = 0;
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static UBYTE clock_control_f = RTC_F_24_12;
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static UBYTE ciaaicr,ciaaimask,ciabicr,ciabimask;
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static UBYTE ciaacra,ciaacrb,ciabcra,ciabcrb;
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static ULONG ciaata,ciaatb,ciabta,ciabtb;
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static UWORD ciaala,ciaalb,ciabla,ciablb;
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static ULONG ciaatod,ciabtod,ciaatol,ciabtol,ciaaalarm,ciabalarm;
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static int ciaatodon, ciabtodon;
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static int ciaatlatch,ciabtlatch;
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static UBYTE ciaapra,ciaaprb,ciaadra,ciaadrb,ciaasdr;
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static UBYTE ciabpra,ciabprb,ciabdra,ciabdrb,ciabsdr;
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static int div10;
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static int kbstate, kback;
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#ifdef HAS_PRT
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static int prtopen;
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static FILE *prttmp;
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#endif
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static void setclr(UBYTE *p, UBYTE val)
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{
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if (val & 0x80) {
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*p |= val & 0x7F;
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} else {
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*p &= ~val;
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}
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}
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static void RethinkICRA(void)
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{
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if (ciaaimask & ciaaicr) {
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ciaaicr |= 0x80;
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custom_bank.wput(0xDFF09C,0x8008);
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} else {
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ciaaicr &= 0x7F;
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/* custom_bank.wput(0xDFF09C,0x0008);*/
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}
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}
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static void RethinkICRB(void)
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{
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if (ciabicr & 0x10) {
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custom_bank.wput(0xDFF09C,0x9000);
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}
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if (ciabimask & ciabicr) {
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ciabicr |= 0x80;
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custom_bank.wput(0xDFF09C,0xA000);
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} else {
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ciabicr &= 0x7F;
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/* custom_bank.wput(0xDFF09C,0x2000);*/
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}
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}
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static int lastdiv10;
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static void CIA_update(void)
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{
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unsigned long int ccount = cycles - eventtab[ev_cia].oldcycles + lastdiv10;
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unsigned long int ciaclocks = ccount / DIV10;
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int aovfla = 0, aovflb = 0, bovfla = 0, bovflb = 0;
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lastdiv10 = div10;
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div10 = ccount % DIV10;
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/* CIA A timers */
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if ((ciaacra & 0x21) == 0x01) {
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//assert((ciaata+1) >= ciaclocks);
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if ((ciaata+1) == ciaclocks) {
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aovfla = 1;
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if ((ciaacrb & 0x61) == 0x41) {
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if (ciaatb-- == 0) aovflb = 1;
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}
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}
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ciaata -= ciaclocks;
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}
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if ((ciaacrb & 0x61) == 0x01) {
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//assert((ciaatb+1) >= ciaclocks);
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if ((ciaatb+1) == ciaclocks) aovflb = 1;
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ciaatb -= ciaclocks;
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}
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/* CIA B timers */
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if ((ciabcra & 0x21) == 0x01) {
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//assert((ciabta+1) >= ciaclocks);
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if ((ciabta+1) == ciaclocks) {
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bovfla = 1;
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if ((ciabcrb & 0x61) == 0x41) {
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if (ciabtb-- == 0) bovflb = 1;
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}
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}
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ciabta -= ciaclocks;
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}
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if ((ciabcrb & 0x61) == 0x01) {
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//assert ((ciabtb+1) >= ciaclocks);
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if ((ciabtb+1) == ciaclocks) bovflb = 1;
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ciabtb -= ciaclocks;
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}
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if (aovfla) {
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ciaaicr |= 1; RethinkICRA();
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ciaata = ciaala;
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if (ciaacra & 0x8) ciaacra &= ~1;
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}
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if (aovflb) {
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ciaaicr |= 2; RethinkICRA();
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ciaatb = ciaalb;
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if (ciaacrb & 0x8) ciaacrb &= ~1;
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}
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if (bovfla) {
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ciabicr |= 1; RethinkICRB();
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ciabta = ciabla;
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if (ciabcra & 0x8) ciabcra &= ~1;
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}
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if (bovflb) {
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ciabicr |= 2; RethinkICRB();
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ciabtb = ciablb;
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if (ciabcrb & 0x8) ciabcrb &= ~1;
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}
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}
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static void CIA_calctimers(void)
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{
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int ciaatimea = -1, ciaatimeb = -1, ciabtimea = -1, ciabtimeb = -1;
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eventtab[ev_cia].oldcycles = cycles;
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if ((ciaacra & 0x21) == 0x01) {
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ciaatimea = (DIV10-div10) + DIV10*ciaata;
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}
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if ((ciaacrb & 0x61) == 0x41) {
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/* Timer B will not get any pulses if Timer A is off. */
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if (ciaatimea >= 0) {
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/* If Timer A is in one-shot mode, and Timer B needs more than
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* one pulse, it will not underflow. */
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if (ciaatb == 0 || (ciaacra & 0x8) == 0) {
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/* Otherwise, we can determine the time of the underflow. */
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ciaatimeb = ciaatimea + ciaala * DIV10 * ciaatb;
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}
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}
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}
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if ((ciaacrb & 0x61) == 0x01) {
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ciaatimeb = (DIV10-div10) + DIV10*ciaatb;
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}
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if ((ciabcra & 0x21) == 0x01) {
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ciabtimea = (DIV10-div10) + DIV10*ciabta;
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}
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if ((ciabcrb & 0x61) == 0x41) {
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/* Timer B will not get any pulses if Timer A is off. */
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if (ciabtimea >= 0) {
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/* If Timer A is in one-shot mode, and Timer B needs more than
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* one pulse, it will not underflow. */
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if (ciabtb == 0 || (ciabcra & 0x8) == 0) {
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/* Otherwise, we can determine the time of the underflow. */
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ciabtimeb = ciabtimea + ciabla * DIV10 * ciabtb;
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}
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}
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}
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if ((ciabcrb & 0x61) == 0x01) {
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ciabtimeb = (DIV10-div10) + DIV10*ciabtb;
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}
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eventtab[ev_cia].active = (ciaatimea != -1 || ciaatimeb != -1
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|| ciabtimea != -1 || ciabtimeb != -1);
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if (eventtab[ev_cia].active) {
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unsigned long int ciatime = ~0L;
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if (ciaatimea != -1) ciatime = ciaatimea;
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if (ciaatimeb != -1 && ciaatimeb < ciatime) ciatime = ciaatimeb;
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if (ciabtimea != -1 && ciabtimea < ciatime) ciatime = ciabtimea;
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if (ciabtimeb != -1 && ciabtimeb < ciatime) ciatime = ciabtimeb;
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eventtab[ev_cia].evtime = ciatime;
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}
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events_schedule();
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}
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void CIA_handler(void)
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{
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CIA_update();
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CIA_calctimers();
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}
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void CIA_hsync_handler(void)
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{
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static int keytime = 0;
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if (ciabtodon)
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ciabtod++;
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ciabtod &= 0xFFFFFF;
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#if 1
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if (indexpulse == 0){
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ciabicr |= 0x10;
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RethinkICRB();
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/* if (dskdmaen != 2)
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DISK_Index();*/
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indexpulse = 30; /* whatever */
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} else {
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indexpulse--;
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}
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#endif
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if (ciabtod == ciabalarm) {
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ciabicr |= 4; RethinkICRB();
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}
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if (keys_available() && kback && (++keytime & 15) == 0) {
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switch(kbstate) {
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case 0:
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ciaasdr = (BYTE)~0xFB; /* aaarghh... stupid compiler */
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kbstate++;
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break;
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case 1:
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kbstate++;
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ciaasdr = (BYTE)~0xFD;
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break;
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case 2:
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ciaasdr = ~get_next_key();
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break;
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}
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ciaaicr |= 8; RethinkICRA();
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}
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}
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void CIA_vsync_handler()
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{
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if (ciaatodon)
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ciaatod++;
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ciaatod &= 0xFFFFFF;
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if (ciaatod == ciaaalarm) {
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ciaaicr |= 4; RethinkICRA();
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}
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}
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static UBYTE ReadCIAA(UWORD addr)
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{
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UBYTE tmp;
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switch(addr & 0xf){
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case 0:
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tmp = (DISK_status() & 0x3C);
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if (!buttonstate[0]) tmp |= 0x40;
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if (!joy0button) tmp |= 0x80;
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return tmp;
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case 1:
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return ciaaprb;
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case 2:
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return ciaadra;
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case 3:
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return ciaadrb;
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case 4:
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return ciaata & 0xff;
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case 5:
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return ciaata >> 8;
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case 6:
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return ciaatb & 0xff;
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case 7:
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return ciaatb >> 8;
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case 8:
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if (ciaatlatch) {
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ciaatlatch = 0;
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return ciaatol & 0xff;
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} else return ciaatod & 0xff;
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case 9:
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if (ciaatlatch) return (ciaatol >> 8) & 0xff;
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else return (ciaatod >> 8) & 0xff;
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case 10:
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ciaatlatch = 1; ciaatol = ciaatod; /* ??? only if not already latched? */
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return (ciaatol >> 16) & 0xff;
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case 12:
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return ciaasdr;
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case 13:
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tmp = ciaaicr; ciaaicr = 0; RethinkICRA(); return tmp;
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case 14:
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return ciaacra;
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case 15:
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return ciaacrb;
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}
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return 0;
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}
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static UBYTE ReadCIAB(UWORD addr)
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{
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UBYTE tmp;
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switch(addr & 0xf){
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case 0:
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return ciabpra;
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case 1:
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return ciabprb;
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case 2:
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return ciabdra;
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case 3:
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return ciabdrb;
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case 4:
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return ciabta & 0xff;
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case 5:
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return ciabta >> 8;
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case 6:
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return ciabtb & 0xff;
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case 7:
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return ciabtb >> 8;
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case 8:
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if (ciabtlatch) {
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ciabtlatch = 0;
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return ciabtol & 0xff;
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} else return ciabtod & 0xff;
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case 9:
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if (ciabtlatch) return (ciabtol >> 8) & 0xff;
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else return (ciabtod >> 8) & 0xff;
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case 10:
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ciabtlatch = 1; ciabtol = ciabtod;
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return (ciabtol >> 16) & 0xff;
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case 12:
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return ciabsdr;
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case 13:
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tmp = ciabicr; ciabicr = 0; RethinkICRB();
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return tmp;
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case 14:
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return ciabcra;
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case 15:
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return ciabcrb;
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}
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return 0;
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}
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static void WriteCIAA(UWORD addr,UBYTE val)
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{
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int oldled;
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switch(addr & 0xf){
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case 0:
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oldled = ciaapra & 2;
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ciaapra = (ciaapra & ~0x3) | (val & 0x3); LED(ciaapra & 0x2);
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if ((ciaapra & 2) != oldled)
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gui_led (0, !(ciaapra & 2));
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break;
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case 1:
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ciaaprb = val;
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#ifdef HAS_PRT
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if (prtopen==1)
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{
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fprintf (prttmp,"%c",val);
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if (val==0x04) {
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#if defined(__unix) && !defined(__bebox__) && !defined(__DOS__)
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pclose (prttmp);
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#else
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fclose (prttmp);
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#endif
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prtopen = 0;
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}
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}
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else
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{
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#if defined(__unix) && !defined(__bebox__) && !defined(__DOS__)
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prttmp=(FILE *)popen ((char *)prtname,"w");
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#else
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prttmp=(FILE *)fopen ((char *)prtname,"wb");
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#endif
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if (prttmp != NULL)
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{
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prtopen = 1;
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fprintf (prttmp,"%c",val);
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}
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}
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#endif
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ciaaicr |= 0x10;
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break;
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case 2:
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ciaadra = val; break;
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case 3:
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ciaadrb = val; break;
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case 4:
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CIA_update();
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ciaala = (ciaala & 0xff00) | val;
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CIA_calctimers();
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break;
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case 5:
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CIA_update();
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ciaala = (ciaala & 0xff) | (val << 8);
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if ((ciaacra & 1) == 0)
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ciaata = ciaala;
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if (ciaacra & 8) {
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ciaata = ciaala;
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ciaacra |= 1;
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}
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CIA_calctimers();
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break;
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case 6:
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CIA_update();
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ciaalb = (ciaalb & 0xff00) | val;
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CIA_calctimers();
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break;
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case 7:
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CIA_update();
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ciaalb = (ciaalb & 0xff) | (val << 8);
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if ((ciaacrb & 1) == 0)
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ciaatb = ciaalb;
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if (ciaacrb & 8) {
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ciaatb = ciaalb;
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ciaacrb |= 1;
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}
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CIA_calctimers();
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break;
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case 8:
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if (ciaacrb & 0x80){
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ciaaalarm = (ciaaalarm & ~0xff) | val;
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} else {
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ciaatod = (ciaatod & ~0xff) | val;
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ciaatodon = 1;
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}
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break;
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case 9:
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if (ciaacrb & 0x80){
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ciaaalarm = (ciaaalarm & ~0xff00) | (val << 8);
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} else {
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ciaatod = (ciaatod & ~0xff00) | (val << 8);
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ciaatodon = 0;
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}
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break;
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case 10:
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if (ciaacrb & 0x80){
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ciaaalarm = (ciaaalarm & ~0xff0000) | (val << 16);
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} else {
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ciaatod = (ciaatod & ~0xff0000) | (val << 16);
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ciaatodon = 0;
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}
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break;
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case 12:
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ciaasdr = val; break;
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case 13:
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setclr(&ciaaimask,val); break; /* ??? call RethinkICR() ? */
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case 14:
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CIA_update();
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ciaacra = val;
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if (ciaacra & 0x10){
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ciaacra &= ~0x10;
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ciaata = ciaala;
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}
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if (ciaacra & 0x40) {
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kback = 1;
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}
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CIA_calctimers();
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break;
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case 15:
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CIA_update();
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ciaacrb = val;
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if (ciaacrb & 0x10){
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ciaacrb &= ~0x10;
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ciaatb = ciaalb;
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}
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CIA_calctimers();
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break;
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}
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}
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static void WriteCIAB(UWORD addr,UBYTE val)
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{
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switch(addr & 0xf){
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case 0:
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ciabpra = (ciabpra & ~0x3) | (val & 0x3); break;
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case 1:
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ciabprb = val; DISK_select(val); break;
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case 2:
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ciabdra = val; break;
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case 3:
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ciabdrb = val; break;
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case 4:
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CIA_update();
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ciabla = (ciabla & 0xff00) | val;
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CIA_calctimers();
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break;
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case 5:
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CIA_update();
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ciabla = (ciabla & 0xff) | (val << 8);
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if ((ciabcra & 1) == 0)
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ciabta = ciabla;
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if (ciabcra & 8) {
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ciabta = ciabla;
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ciabcra |= 1;
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}
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CIA_calctimers();
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break;
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case 6:
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CIA_update();
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ciablb = (ciablb & 0xff00) | val;
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CIA_calctimers();
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break;
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case 7:
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CIA_update();
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ciablb = (ciablb & 0xff) | (val << 8);
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if ((ciabcrb & 1) == 0)
|
|
ciabtb = ciablb;
|
|
if (ciabcrb & 8) {
|
|
ciabtb = ciablb;
|
|
ciabcrb |= 1;
|
|
}
|
|
CIA_calctimers();
|
|
break;
|
|
case 8:
|
|
if (ciabcrb & 0x80){
|
|
ciabalarm = (ciabalarm & ~0xff) | val;
|
|
} else {
|
|
ciabtod = (ciabtod & ~0xff) | val;
|
|
ciabtodon = 1;
|
|
}
|
|
break;
|
|
case 9:
|
|
if (ciabcrb & 0x80){
|
|
ciabalarm = (ciabalarm & ~0xff00) | (val << 8);
|
|
} else {
|
|
ciabtod = (ciabtod & ~0xff00) | (val << 8);
|
|
ciabtodon = 0;
|
|
}
|
|
break;
|
|
case 10:
|
|
if (ciabcrb & 0x80){
|
|
ciabalarm = (ciabalarm & ~0xff0000) | (val << 16);
|
|
} else {
|
|
ciabtod = (ciabtod & ~0xff0000) | (val << 16);
|
|
ciabtodon = 0;
|
|
}
|
|
break;
|
|
case 12:
|
|
ciabsdr = val;
|
|
break;
|
|
case 13:
|
|
setclr(&ciabimask,val);
|
|
break;
|
|
case 14:
|
|
CIA_update();
|
|
ciabcra = val;
|
|
if (ciabcra & 0x10){
|
|
ciabcra &= ~0x10;
|
|
ciabta = ciabla;
|
|
}
|
|
CIA_calctimers();
|
|
break;
|
|
case 15:
|
|
CIA_update();
|
|
ciabcrb = val;
|
|
if (ciabcrb & 0x10){
|
|
ciabcrb &= ~0x10;
|
|
ciabtb = ciablb;
|
|
}
|
|
CIA_calctimers();
|
|
break;
|
|
}
|
|
}
|
|
|
|
void CIA_reset(void)
|
|
{
|
|
kback = 1;
|
|
kbstate = 0;
|
|
|
|
ciaatlatch = ciabtlatch = 0;
|
|
ciaatod = ciabtod = 0; ciaatodon = ciabtodon = 0;
|
|
ciaaicr = ciabicr = ciaaimask = ciabimask = 0;
|
|
ciaacra = ciaacrb = ciabcra = ciabcrb = 0x4; /* outmode = toggle; */
|
|
div10 = 0;
|
|
lastdiv10 = 0;
|
|
CIA_calctimers();
|
|
|
|
ciabpra = 0x04;
|
|
}
|
|
|
|
void dumpcia(void)
|
|
{
|
|
printf("A: CRA: %02x, CRB: %02x, IMASK: %02x, TOD: %08lx %7s TA: %04lx, TB: %04lx\n",
|
|
(int)ciaacra, (int)ciaacrb, (int)ciaaimask, ciaatod,
|
|
ciaatlatch ? " latched" : "", ciaata, ciaatb);
|
|
printf("B: CRA: %02x, CRB: %02x, IMASK: %02x, TOD: %08lx %7s TA: %04lx, TB: %04lx\n",
|
|
(int)ciabcra, (int)ciabcrb, (int)ciabimask, ciabtod,
|
|
ciabtlatch ? " latched" : "", ciabta, ciabtb);
|
|
}
|
|
|
|
/* CIA memory access */
|
|
|
|
static ULONG cia_lget(CPTR) REGPARAM;
|
|
static UWORD cia_wget(CPTR) REGPARAM;
|
|
static UBYTE cia_bget(CPTR) REGPARAM;
|
|
static void cia_lput(CPTR, ULONG) REGPARAM;
|
|
static void cia_wput(CPTR, UWORD) REGPARAM;
|
|
static void cia_bput(CPTR, UBYTE) REGPARAM;
|
|
|
|
addrbank cia_bank = {
|
|
cia_lget, cia_wget, cia_bget,
|
|
cia_lput, cia_wput, cia_bput,
|
|
default_xlate, default_check
|
|
};
|
|
|
|
ULONG cia_lget(CPTR addr)
|
|
{
|
|
return cia_bget(addr+3);
|
|
}
|
|
|
|
UWORD cia_wget(CPTR addr)
|
|
{
|
|
return cia_bget(addr+1);
|
|
}
|
|
|
|
UBYTE cia_bget(CPTR addr)
|
|
{
|
|
if ((addr & 0x3001) == 0x2001)
|
|
return ReadCIAA((addr & 0xF00) >> 8);
|
|
if ((addr & 0x3001) == 0x1000)
|
|
return ReadCIAB((addr & 0xF00) >> 8);
|
|
return 0;
|
|
}
|
|
|
|
void cia_lput(CPTR addr, ULONG value)
|
|
{
|
|
cia_bput(addr+3,value); /* FIXME ? */
|
|
}
|
|
|
|
void cia_wput(CPTR addr, UWORD value)
|
|
{
|
|
cia_bput(addr+1,value);
|
|
}
|
|
|
|
void cia_bput(CPTR addr, UBYTE value)
|
|
{
|
|
if ((addr & 0x3001) == 0x2001)
|
|
WriteCIAA((addr & 0xF00) >> 8,value);
|
|
if ((addr & 0x3001) == 0x1000)
|
|
WriteCIAB((addr & 0xF00) >> 8,value);
|
|
}
|
|
|
|
/* battclock memory access */
|
|
|
|
static ULONG clock_lget(CPTR) REGPARAM;
|
|
static UWORD clock_wget(CPTR) REGPARAM;
|
|
static UBYTE clock_bget(CPTR) REGPARAM;
|
|
static void clock_lput(CPTR, ULONG) REGPARAM;
|
|
static void clock_wput(CPTR, UWORD) REGPARAM;
|
|
static void clock_bput(CPTR, UBYTE) REGPARAM;
|
|
|
|
addrbank clock_bank = {
|
|
clock_lget, clock_wget, clock_bget,
|
|
clock_lput, clock_wput, clock_bput,
|
|
default_xlate, default_check
|
|
};
|
|
|
|
ULONG clock_lget(CPTR addr)
|
|
{
|
|
return clock_bget(addr+3);
|
|
}
|
|
|
|
UWORD clock_wget(CPTR addr)
|
|
{
|
|
return clock_bget(addr+1);
|
|
}
|
|
|
|
UBYTE clock_bget(CPTR addr)
|
|
{
|
|
time_t t=time(0);
|
|
struct tm *ct;
|
|
ct=localtime(&t);
|
|
switch (addr & 0x3f)
|
|
{
|
|
case 0x03: return ct->tm_sec % 10;
|
|
case 0x07: return ct->tm_sec / 10;
|
|
case 0x0b: return ct->tm_min % 10;
|
|
case 0x0f: return ct->tm_min / 10;
|
|
case 0x13: return ct->tm_hour % 10;
|
|
case 0x17: return ct->tm_hour / 10;
|
|
case 0x1b: return ct->tm_mday % 10;
|
|
case 0x1f: return ct->tm_mday / 10;
|
|
case 0x23: return (ct->tm_mon+1) % 10;
|
|
case 0x27: return (ct->tm_mon+1) / 10;
|
|
case 0x2b: return ct->tm_year % 10;
|
|
case 0x2f: return ct->tm_year / 10;
|
|
|
|
case 0x33: return ct->tm_wday; /*Hack by -=SR=- */
|
|
case 0x37: return clock_control_d;
|
|
case 0x3b: return clock_control_e;
|
|
case 0x3f: return clock_control_f;
|
|
}
|
|
return 0;
|
|
}
|
|
|
|
void clock_lput(CPTR addr, ULONG value)
|
|
{
|
|
/* No way */
|
|
}
|
|
|
|
void clock_wput(CPTR addr, UWORD value)
|
|
{
|
|
/* No way */
|
|
}
|
|
|
|
void clock_bput(CPTR addr, UBYTE value)
|
|
{
|
|
switch (addr & 0x3f)
|
|
{
|
|
case 0x37: clock_control_d=value; break;
|
|
case 0x3b: clock_control_e=value; break;
|
|
case 0x3f: clock_control_f=value; break;
|
|
}
|
|
}
|