Well done Steve with this development.
I recall you toyed with the idea of dual processors, ie existing 80C85
for M100 mode & NSC800 for Z80 CP/M mode. What was the outcome of that
& why have you gone solely NSC800 please?
Philip
On 5/10/2020 7:24 am, Stephen Adolph wrote:
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
