I'm finishing redrawing the schematics in Kicad 8, and if I'll find time, I wonder to rebuild a system using not-too-hard-to-find components, same philosophy (eurocard) but simpler connections, maybe a Z80 standard (or the like) bus. Obviously, the firmware will need to be adjusted, so I'm going also to modify the EPROM contents.

If you think it's a reasonable project, let me know if add it to this thread or open a new one.

It is a really bad idea to invent yet another non standard computer bus system that nobody else uses. And the SC84 design uses a chip that is not common. 

The STE bus is fully specified and does not tie you to any particular CPU.

I agree, I was thinking about the Z80STD bus, but instead of using edge connectors, using some better for the experimenter.

I like the STE, it should be a good idea. But the problem is that, here in Italy, the breadboards with the DIN connectors are becoming difficult to find, so I was thinking about the standard IDC connectors in Eurocards.

The connectors are readily available.
https://www.mouser.it/c/connectors/backplane-connectors/din-41612-connectors/?q=din41612&number%20of%20positions=64%20Position&number%20of%20rows=2%20Row&pitch=2.54%20mm&_gl=1%2A7cklao%2A_ga%2ANDg4NjAxMTEzLjE3MjQ2Njc0MjU.%2A_ga_15W4STQT4T%2AMTcyNDY2NzQyNS4xLjEuMTcyNDY2NzU1OC4xNy4wLjA.

Contact me by email and I can let you have just about everything you want - I may have to trawl through old HDD's for some of the stuff, but I throw NOTHING away. Newsletters, listings, disassembly's etc.  I have all software for the Z80 version - I had no need for the 64180, but have a disk John Adams sent me with MCOS/SCIDOS for that CPU.  He also confirmed by email at that time that all SC84 software should thenceforth be considered Public Domain - just in case that's of interest. Regards,

Keith, I have a print out (on continuous listing paper) of the Z80 MCOS.ASM done on a dot matrix printer in about 1985.   I have over the years tried to text process this, but I was too impoverished at print time to afford a new print cartridge and my Adobe Acrobat OCR now consistently fails to read the text. You have had an excellent bash at the disassembly of MCOS, but would you find John Adams' original labels & comments useful? I find the most legible copy is via the 'photo' setting on my scanner, so file would be quite large and some of the text at pages start/end runs over the paper perforations. You interested?

I also have some floppy disks; the remnant of my SC84 is such that I cannot read/copy them - but could you? 

Paul

The scans would certainly be welcome. I have no SC84 machine, but Wim has. Perhaps he could read them for us.

I have a pile of documentation from the original Powertran PSI-COMP80 computer, and the user club newsletters, and some software on a small number of cassettes.


https://www.ebay.co.uk/itm/Powertran-PSI-COMP80-Z80-COMPUTER-TECHNICAL-DOCS/402555863609

Thanks for the tip.  I'd scan the lot as a service to fellow techno-historians but the postage alone is about what I would pay out of my own pocket. You could try my local computer museum but museums have had no cash coming in for about a year. Likewise most people.