Hi Josh,
Great news! Thank you for all your efforts bringing this board to
life . Even though my hardware seemed to work properly, I still had a
concern that I had a hardware problem since I had so much trouble
running CP/M from the SD card. I was actually relieved when you
experienced similar problems. At least it was easy to fix for you once
you realized the differences between the 2 CP/M releases. I feel what
you have done with this board is tremendous. You designed a complete
S-100 single board computer that is compatible with IMSAI, Altair & the
MiniFP front panels, provided a nice monitor program and customized
CP/M to run on it. The board was a lot of fun to build and I am looking
forward to building the MiniFP to work with it. Also, kudos to Don
Caprio, Rich Cini & you for all your work on the MiniFP board. These 2
boards will make a very compact retro S-100 system when used in
conjunction with the N8VEM 8 slot S-100 backplane. That still leaves 6
slots open for expansion & hardware testing. Woo Hoo! Thanks again for
a job well done,
Also a huge thank you to John Monahan, Andrew Lynch and all the
others who have done so much for keeping the S-100 bus alive almost 40
years after it's inception. I have many of John's & Andrew's boards in
the process of being completed but I finished the Altair-IMSAI 8080
board first as it gave me an operational system on one board to play
around with before I finish the other boards.
Regards,
Jeff Galinat
On 11/9/2014 3:30 PM, Crusty OMO wrote:
Hi Group,
Apparently in CP/M 2.2, they number the sectors from 0. While, iirc,
in CP/M 1.4 it started at 1.
I spent hours testing my disk read/write routines and could not find
faults.
The whole fix, just really required me to remove a simple "Decrement
Sector" instruction because I thought CP/M used 1 as it's starting
sector, where I needed 0.
Sigh... ok, problem solved....
New firmware file and Disk file images (with CP/M standard files
uploaded) on the wiki site at:
http://n8vem-sbc.pbworks.com/w/file/88759892/FIRMWARE%20and%20CPM%20v-disk%20image%20AIR-V12.zip
Cheers!
Josh Bensadon
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