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Updated commentary in README

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Bobbi Webber-Manners 2019-10-19 22:45:07 -04:00
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@ -73,8 +73,11 @@ support for all the CP/M 2.2 system calls, which should allow a CP/M program
to run on the Softcard Z80 CPU and have all the system calls routed to the
6502 and serviced using the Apple II ROM monitor routines and the ProDOS MLI.
This is at an embryonic stage at the moment as it only provides a few system
calls. Only console I/O has been tested and confirmed to be working so far:
I have most of the calls now and most of them have been tested to some degree
and aren't *totally* broken. The biggest gap right now is that none of the
random access filesystem calls have been implemented. Also the code does not
really fill out all the proper fields of the FCB. I am still working out what
CP/M programs really need to see.
- BDOS call 00h: `C_TERMCPM` - System reset
- BDOS call 01h: `C_READ` - Console input
@ -115,7 +118,7 @@ There are two parts to the BDOS emulation:
assembling this using `Z80asm` under Linux (it got too large to assemble
with `Z80asm` under ProDOS on the Apple II.
- `softcard65.asm` - This is the 6502 back end code. Written in Merlin8 v2.58.
Loads at $0900 in 6502 space.
Loads at $0900 in 6502 space. This is less than 100 bytes of code!
# Sample Programs