Yes, I ran a hacked up version of Cromemco ZM1 a number of years ago. The
major hacks include:
Duel console drivers (2810 serial and/or my Fulcrum Intelligent
Video board)
Removed code to program 2708 EPROMs on the Cromemco Bytesaver
Added a boot loader to boot CP/M from disk
In fact, my monitor boot ROM is still a VERY much modified Cromemco ZM1. But
it no longer runs on the 2810. Instead, it runs on my memory board, but the
effect is still the same. I guess I could move it back to the 2810 if I
wanted, but it’s happy on the memory board.
At one time, I was trying to move as much of my CP/M BIOS into ROM, and this
would have been a super-enhanced ROM. But I pretty much gave up on the idea
when I built my memory board with battery-backed RAM (CP/M can run from
power-on without booting it from disk.) And then I built the N8VEM CF-IDE
board and came to the realization that getting it to work in CP/M 2.2 was going
to be difficult. CP/M 3 would be a much better approach. So, now I’m working
on building a CP/M 3 system, and this is just not conducive to ROMMING much of
the code.
Bob Bell
From: [email protected] [mailto:[email protected]] On
Behalf Of Jeff Albrecht
Sent: Tuesday, April 14, 2015 5:27 PM
To: [email protected]
Subject: [N8VEM-S100:6743] Re: CCS 2810 CPU Rom
On Tuesday, April 14, 2015 at 1:30:30 PM UTC-7, Jeff Albrecht wrote:
In my drawers I found
TMS2716C - apparently not supported by GQ-4X
AM2716DC - Looks to be supported by GQ-4X as 'AM2716'
AM2732A-2DC - I found a setting for 'AM2732A' I wonder what the 2DC, missing
from GQ device id, means?
Success!
I programmed the AM2716DC with the GQ setting of 'AM2716'. It didn't pass
verify but it looked like it had programmed. I put it in the newly acquired CCS
2810 cpu board, powered up and taped return a couple times. Got the Moss 2.2
signon.
Found a couple 2716A at Futurlec this is a 200ns device
http://www.futurlec.com/cgi-bin/search/qty_price.cgi?part_no=2716A-200. Any
other suggestions where to buy? I'm often told to stay away from eBay... ???
Bob, have you ever run a different or enhanced capability ROM on your CCS
2810s?
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