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Re: [N8VEM-S100:1621] IMSAI 8080 CPU card replacement

  I would also take 3 boards if a PCB board for this design is ordered.
Jeff Galinat

On 5/9/2013 1:17 PM, John Monahan wrote:

Hi Don, just added the link. See here:-



bottom of page.  BTW, if there is a decent core of people I’m for having Andrew do a batch run.  I’m good for 3.






John Monahan Ph.D

e-mail: mon...@vitasoft.org

Text:    mon...@txt.att.net





From: n8vem...@googlegroups.com [mailto:n8vem...@googlegroups.com] On Behalf Of Crusty OMO
Sent: Sunday, April 28, 2013 9:20 PM
To: n8vem...@googlegroups.com
Subject: [N8VEM-S100:1596] IMSAI 8080 CPU card replacement


Hi Andrew,

Just thought you would like to see what I've done on one of your prototyping boards.

It's a replacement CPU card for an IMSAI 8080.  It uses an 8080A and has the 16 pin socket to connect to the Front Panel.
I put 64K of RAM on the same card and a PIC microcontroller to provide Serial I/O, Floppy Disk emulation on a 8Meg flash chip and a Boot strap program.
It can boot up into CP/M 1.4 all on the same card.  I did this because many of the other cards of that era are flakey and I wanted to get the IMSAI 8080 computer at the PC Museum in Brantford, Ontario working.

If anyone wants the full schematic & firmware, just let me know where to upload it.