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RE: [N8VEM-S100:5579] Re: Problem with ALTAIR-IMSAI 8080 CPU Board


Nope, I will take no credit for helping you to find that bad IC.  That was your handy work in reading the schematic and connecting the dots.  If you are too modest to take 100% of the credit, then I offer this solution, you take 90% and I'll take 10% for my good looks and sense of humour.

Using the latest version of firmware, you can read the latest SD Card Image on the wiki site.
Download the Firemware & SD Image file at


This file will have CP/M with all the standard files.
There is also another file there called MON-32K.com.  This is a small version of my monitor program that loads itself at 0x8000.
You can also use the Monitor within the firmware, it loads at 0xDB00 thus allowing you to transfer even bigger files.

Option 1.
Boot CP/M
Run MON-32K
Upload your file to 0x0100 by using this command:
X   U   100
then upload your binary image file via X-Modem
After the upload, press <ESC> to exit the monitor and return to CP/M
In CP/M, use the SAVE command to save the memory to a file.

SAVE   n   filename.ext
where n = number of 256 byte pages to save.

btw, this is how I transferred all but 1 of the Standard CP/M files.
The last CP/M file was just over 32K, so I needed to use the built in monitor at 0xDB00

Option 2.  Built in monitor at 0xDB00
Restart your computer,
Choose Monitor,
Upload your file as described in option 1
Restart computer
Boot CP/M
Use SAVE command

To save real big files, I'll need to configure Martin's XModem Program to work with my console port.  Which I plan to do, once I get my ALTAIR loading 4K BASIC...


Date: Thu, 13 Nov 2014 16:27:17 -0800
From: n8vem...@googlegroups.com
To: n8vem...@googlegroups.com
Subject: [N8VEM-S100:5579] Re: Problem with ALTAIR-IMSAI 8080 CPU Board

Hi everyone,

Just a quick update. With help from Josh I found a bad IC on my board. Made the replacement and now the SD card is working!!!

Now I need to understand how to use the SD card with CP/M. This is new to me. Are there any docs on how to transfer programs to the SD card?

Again, thanks Josh!


On Thursday, October 30, 2014 8:40:18 AM UTC-4, hl...@aol.com wrote:

I just finished assembly of the S-100 8080 CPU board for my ALTAIR 8800. The board appears to run great except that I can't get the SD card to initialize! I have tried several different makes of cards from 256Mb to 1Gb but no luck. Any ideas from those who have built this board? Any feedback would be great.

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