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Update README with info on memory configs

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Bumps to v0.21
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Matt Evans 2024-08-27 01:05:09 +01:00
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README.md
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@ -1,12 +1,13 @@
# Micro Mac (umac)
v0.2 18 August 2024
v0.21 26 August 2024
This is a minimalist Apple Macintosh 128K/512K emulator. It uses the
_Musashi_ 68K interpreter and lashes the absolute minimum in hardware
emulation around it so as to boot and run basic apps. It's been
tested with System 2.0 up to System 3.2, and runs MacWrite, MacDraw, and
Missile Command.
tested with System 2.0 up to System 7.5.5, and runs MacWrite, MacDraw, and
Missile Command. (For a Mac 128K, System 3.2 is the last OS that will
run, but by configuring 2MB+, even System 7 will work.)
You can write, draw, and unwind with an apocalyptic game. Live well.
@ -34,8 +35,10 @@ This emulates the following hardware:
* SCC DCD pin change interrupts, for mouse
* Paravirtualised disc storage
* Defaults to 128K of RAM, but will run as a Mac 512K by building
with `MEMSIZE=512`. Or, you could use 1024, 2048, or 4096 to
make a 1/2/4MB Mac Plus.
with `MEMSIZE=512`. Or, you could use 1024, 2048, or 4096 to make
a 1/2/4MB Mac Plus-like machine. Straying off-piste a little, you
can also use unsupported values like 256, 208, 192KB; when this is
done, the ROM is patched to "probe" the correct memory size.
There's no emulation for:
@ -94,7 +97,7 @@ ROM is _Mac Plus V3 ROM_, checksum `4d1f8172`.
(Note this makes this a _Mac 128Ke_, fancy!)
Then, get a boot disk. Any System up to 3.2 should work fine (though
Then, get a boot disk. Any System up to 3.2 should work fine on a 128K (though
I don't think I've tried 1.0). I just tested a random German System 3.2 disc
from WinWorld and it works fine. You might want to use Mini vMac or
Basilisk (i.e. a proper emulator) to prepare a disc image with some