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I've collected and build CP/M systems for decades (over 4) so I have system that run from sludge slow to current idea of fast. Z80s at 10mhz, Z180s at 12mhz and A Z280 at 10mhz. That and no shortage

and 4mhz should be enough for anyone ? ________________________________ Sent: September 29, 2020 12:35 PM To: [email protected] <[email protected]> Subject: Re: [Z80MC] Where's the CPM

Considering the DEC Robin ( I have two) is a 4mhz Z80 with 64K of ram with banked boot/terminal roms and slow floppies (TM100s) is the comparison?that's terrible. A long time back I got a dozen of

I used reverse connectors as well for the olduino/z. Are you able to put the front panel on top of the

Thanks all, Working fine now. I downloaded the CPM files from the website and simply copied the contents of the ZIP to the SDcard and then booted the Z80MC with the SIO board but not the FP. Some

normal programs in CP/M return to CP/M, the reading of the system sectors should satisfy clearing out the cache.<< CP/M bios get signals from the BDOS to determine that for deblocking. The BIOS then

Hi Alison, The way I wrote CP/M BIOS on the Z80MC is to open a FAT16 File and use it like a drive.I wanted to use the SD card in a manner that would still let the user read/write files through

With care cpm explorer runs in wine. Either case CP/M knows nothing of fat so what many do is create a contiguous 8mb file as a container file and then find out what block address it starts at.?

Paul Bigwood wrote: Hi Paul, I format the SD-card in FAT16; but do not pre-load the CP/M files onto it. The computer I'm using is running linux, and it's problematic to load the CP/M files on it

Morgan,? Thank you for the great news.? Hope you get CP/M running too.? That's the part that amazes me, CP/M in the palm of your hand.

Hello Josh, I've got some excellent news! I figured out what the problem was, turns out the UART chip was the issue. I ordered a replacement because I wanted to test the socketed stuff before I

Hi Morgan, Sorry, I missed this email post.? Ok, so where are you at now?? If you boil it down, the circuit either fails because of a bad component or bad circuitry. It's a slow process, but

Hello Josh, Unfortunately I don't have one of those to test with. I'm mostly limited to just a multimeter at the moment. Thanks, Morgan

Hi Morgan,? I haven't actually measured the current draw on my boards, but 200mA was a guess at the most it should use.? I think 70mA is good enough. If you put a scope on the UART output and

Hello Richard, The connectors seem to be fine, I've got continuity from the bottom board to the top and none of them are shorted to each other. Unless there's something I'm missing I'm thinking they

I have found on my setup that the stacking connectors are particularly sensitive. Sometimes I need to play with the stack to get it working properly. http://www.classiccmp.org/cini Long Island S100

Hello Josh, I think I connected my multimeter correctly, I put it between the FTDI cable and the terminal on the side, and I ended up measuring ~70mA with the SIO and CPU cards. I tried out the other

Hi Morgan, Can you measure the current draw?? Should be about 200mA I think?? If it's too high, try removing the UART chip, it may be faulty? Try other chips, remove one at a time. If you are in

Hello everyone, hope you're having a fine day! I just picked up this kit a few weeks ago and I haven't been able to get the SIO card working. The front panel and CPU card work fine together but if I

Thanks Josh. Modem works fine with a PC dialing into the BBS so it’s not that. I found another CP/M modem program to try. I also got the 32k RAM today so I might swap that out as well and re-enable