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Same here. I based my system on CP/mega88 by Takashi Toyoshima, (also an i8080 emulator) but turned it into an Z80 emulator with several more modifications. It is now running in an ATMega 168 @ 20 MHz. it boots CP/M 2.2, CP/M 3.1, Dos+, ZCPR2/ZSDOS and ZPM. The apparent speed is something like...

Maybe you could benefit from using hTest-hFormat from Kolod research. I have version 2.1 (attached) It comes with an extensive manual, of which I do not have a digital copy. Maybe you can find it somewhere on the web.

does this help?

Ah, OOPS... Correct image attached. Consider PC-File as a bonus :-P

My suggestions would be PC-Talk , Bitcomv3.02 or Supercom v1.01. And then there is Smartterm v 2.4, but that one comes on 3 floppies. (installs on only one though) Images are attached. If you need only the files, let me know

Using download only needs 2 steps: 'hexxfer filename' to create the package, and ALT-S to start serial transfer, (Minicom already knows where to find the package file) select ASCII and ENTER. It ends up under the correct user too. I never bothered to adapt hexxfer for more than one file. If I...

I use a version of Grant Searle's (http://www.searle.wales/) DOWNLOAD.COM for uploading files using the console interface. I have modified versions that work on most CP/M derivatives as well as a packager program in BASH. It is very useful, it only requires a stable serial connection and robust...

I understand why you would consider serial numbers. Microsoft does this all the time. I have difficulty understanding why you would want to forcefully match BDOS and CCP when you were supposed to treat them as monolithic anyway. I Guess the possibility of overwriting (part of) BDOS became...

I checked, My Ampro littleboard BIOS also loads both CCP and BDOS at warm boot. This seems to be the best practice then. Thanks for the help

Then Why use a serial (version) number at all? I can understand you don't want to load a CCP which does not match the BDOS, but when you always load both there is no point to it is there?

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...

The words 'sense, sensible, useful, cost-effective' etc have absolutely no meaning with this kind of thing. Talking of sensible, I managed to free up another IO pin so now i have a drive LED too. The sensible thing would probably be to double the RAM or something, but, come on we're talking...

All information and build data, source files, image files etc is available here: https://www.retrobrewcomputers.org/doku.php?id=builderpages:rhkoolstar:start second item from the top. Have fun Rienk

@Chuck: I appreciate your sentiment. I like this little board, because it 'feels' like a classic system. And I have plenty of those too. I personally see little difference in emulating on a pi pico or on a modern PC. At current EBAY and JLCPCB prices, including shipping, you can build one for...

@geowar1: I believe you are more interested in the Z80 version of the SD card is it not? The first 57 volumes zip to some 90 Mbytes, too large for here. PM me an email address and I'll send them to you. They are just a stack of 8MByte images with the following layout: diskdef 8mb-hd seclen...

The 5 dollar price point? (that's what I paid for it initially) And it is fun getting it to work. Because I can? Seriously, You are asking in a vintage forum why I'm using old parts?

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...

Maybe I'm on a wild goose chase here. The DRIPAK files only reference CP/M 3.0, as does bioskrnl.asm, but BDOS call 0Ch returns HL=0031 meaning 3.1 So...furball and Doug are probably right and CP/M 3.0 might be the oddball out. So I'm done after all. good to know. Rienk

Well you can use the board in an external device too. It only misses the tape connector for the 5 volt supply. You just solder a serial plug on a short lead to the board, apply 5volt and you're in business. I can whip this up for you if you like. 3d print a fancy box and all...

Thanks Doug, I'll check it out..... Hmmmm, it seems this is also a 3.0 version. the only difference I can find is the copyright message. My source is DRIPAK.ZIP where copyright is still Digital Research. The files you are referencing list Caldera as the copyright owner. DRIPAK also includes...