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I noticed that my CP/M 2.2 implementation would sometimes crash after completion of certain programs. Examples are Turbo pascal, toolworks C/80, Digital Link v1.31. I have determined that this is caused by said applications overwriting the first 6 bytes of BDOS, which contains the serial number...

Hi all I recently finished my latest project, which is a i8080 CP/M computer, emulated in an ATMega88 on a circuit board the size of about half a credit card. This originally is the brainchild of Takashi Toyoshima, but fixed and drastically improved upon. It now has 128kByte of banked memory...

I am looking for the system files of CP/M 3.1. In CP/M 3.0 they are called BNKBDOS3.SPR, RESBDOS3.SPR, BIOSKRNL.ASM, CPMLDR.ASM and CCP.COM. Possibly I need a new GENCPM.COM too. I assume the names are the same for CP/M 3.1? I already have the 3.0 version and know how to make BNKBIOS3.SPR...

Hi all, I built an SD2IEC with a PCB of my own design. It is based on the Shadowolf schematics, using SMD parts and a micro-SD socket. I can make some more for someone interested, at cost, ($5.00, including shipping - letter < 20 gram). Please check the enclosed picture and note that it is...

I am the proud owner of a Macintosh SE/30 and I wanted to experiment with a 32bit 'clean' ROM. So I decided to design my own pcb. After some soldering woes I got it to work, but as per usual, I now have about 25 SIMM boards left over. (3 SIMMs fit on a 10x10 board. Wink If somebody is...

I recently acquired a Zenith supersPORT ZWL-184-02 in a non-working condition. It would not power on and the plastic was broken in several places. To fix the electronics I replaced the fuse (duh) and repaired the display connector (one pin had worked itself out of the plastic) after which it...

Hi All, I am am the happy owner of the above system. I fixed the broken plastic parts, repaired the electronics and it seems to be in good working order. However it has a custom ROM called "ACCESS PROTECTION" (APBIOSA0-184 and APHDCA12-184) which does exactly what it is supposed to do, i.e. I...