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.
From: n8vem...@googlegroups.com [mailto:n8vem...@googlegroups.com] On Behalf Of Jeff Albrecht
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?
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?