3 ms·
I grew up with the Spectrum, and wrote a CP/M emulator a while back. I'd be curious to see how complete it would get. I struggled a lot with some complex soft
by stevekemp 8mo ago
I grew up with the Spectrum, and wrote a CP/M emulator a while back. I'd be curious to see how complete it would get.
I struggled a lot with some complex software, which worked on some emulators and failed on others (and mine).
For example one bug I had, which is still outstanding, relates to the Hisoft C compiler:
https://github.com/skx/cpmulator/issues/250 https://github.com/skx/cpmulator/issues/250
But I see that my cpm-dist repository is referenced in the download script so that made me happy!
It's great to see people still using CP/M, writing software for it, and sharing the knowledge. Though I do think the choice to implement the CCP in C, rather than using a genuine one, is an interesting one, and a bit of a cheat. It means that you cannot use "SUBMIT" and other common-place binaries/utilities.
- antirez 8mo agoThank you for your work about CP/M, Steve!
- tasty_freeze 8mo agoKnowing nothing about your code, I'd suggest checking if the code uses the DAA instruction. It is by far the trickiest thing to get right. Don't assume well behaved code -- what happens if A=0x5C and B=0xF4 and you execute "add b; daa"? That is, if you attempt to correct a sum which didn't start with valid decimal digits.
- stevekemp 8mo agoInteresting point, I'll take a look. (The z80 emulation was the only thing I didn't write myself, though it does pass the standard test-programs I've not looked at how complex/complete their testing is.)