bandy@amdcad.UUCP (03/21/87)
In article <1987Mar19.141504.21625@gpu.utcs.toronto.edu> edwest@gpu.utcs.toronto.edu (Dr. Edmund West) writes: > Incidentally, I got started on all this when I tried to install >SUPRBDOS (the public domain replacement for DRI's BDOS) and discovered >that the HDC driver trashes the IX register SUPRBDOS is using. Boo on SUPRBDOS for doing that. CP/M-80 is an *8080* operating system. If your BIOS or BDOS uses any of the z80 register set, it MUST save them or else it will break many many programs. This is my biggest gripe with the turkey who did the bios and roms for the Osborne-1. (grumble grumble) andy ps. If anyone wishes to purchase my Osborne, give me a ring or drop some mail... [it works perfectly, I just have a s100 system now] -- Andrew Scott Beals, {lll-crg,decwrl,allegra}!amdcad!bandy +1 408 749 3683
mwilson@crash.UUCP (03/22/87)
In article <15244@amdcad.UUCP> bandy@amdcad.UUCP (Andy Beals) writes: >In article <1987Mar19.141504.21625@gpu.utcs.toronto.edu> edwest@gpu.utcs.toronto.edu (Dr. Edmund West) writes: >> Incidentally, I got started on all this when I tried to install >>SUPRBDOS (the public domain replacement for DRI's BDOS) and discovered >>that the HDC driver trashes the IX register SUPRBDOS is using. > >Boo on SUPRBDOS for doing that. > >CP/M-80 is an *8080* operating system. If your BIOS or BDOS uses any of >the z80 register set, it MUST save them or else it will break many many >programs. This is my biggest gripe with the turkey who did the bios and >roms for the Osborne-1. (grumble grumble) I have never had *anything* "break", although both my BDOS ( SUPRBDOS ) and my BIOS use the Z80 register set. I would submit to you that with the number of Z80 CP/M machines around vs. 8080 machines, any program that assumes that the extra Z80 registers are inviolate is asking for trouble. Why must the BIOS/BDOS save the registers? You don't expect HL, or BC to be preserved after a BDOS call, why should IX or IY be? BTW... has anyone noticed the following with SUPRBDOS? Occasionally, it will report 2 files with the same name on the same disk, although there is only one. It's never fatal, and never seems to show up unless SUPRBDOS detects that you've swapped disks. -- ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ Marc Wilson ( mwilson@crash.CTS.COM ) ARPA: ...!crash!mwilson@nosc ...!crash!pnet01!pro-sol!mwilson@nosc UUCP: [ akgua | hp-sdd!hplabs | sdcsvax | nosc ]!crash!mwilson ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~