Steve, this is utterly fascinating, thank you for sharing this and your progress. I look forward to your updates
________________________________ From: M100 <m100-boun...@lists.bitchin100.com> on behalf of Stephen Adolph <twospru...@gmail.com> Sent: Sunday, October 4, 2020 2:24 PM To: m...@bitchin100.com <m...@bitchin100.com> Subject: Re: [M100] Model 100 converted to NSC800 (aka Z80) part 2 The processor adapter board is low profile, having pins short enough to allow the PCB itself to rest on the socket, on the main board. Then there is enough room for the CPU socket for the NSC800. The main rom, being closer to the front, has less room. In that case, no socket for the option rom. The 27C256 is soldered to the pcb, with the pcb flush mounted to the main rom socket. A Z80 isn't a good natural fit as the M100 is designed around the multiplexed address/data bus with the ALE signal to latch. That's why the NSC800 exists; it was National Semiconductor taking advantage of Z80 improvements, while leveraging the chip sets for the 8085. I haven't posted the design info yet. The PCB and schematic, in the end, are very simple. I'll start documenting it at the wiki. Now, I am trying to think of a quick way to compile TS-DOS from Ken's disassembly, for CP/M. Not sure I want to re-write it in Turbo Pascal or C. Steve On Sun, Oct 4, 2020 at 12:48 PM RETRO Innovations <go4re...@go4retro.com<mailto:go4re...@go4retro.com>> wrote: How is the fit, with the socket and adapter? Is there room? Has anyone tried to support a Z80 in the same way? Are your design plans available anywhere? JIm
