RE: [N8VEM-S100:5553] ALTAIR-IMSAI 8080 CPU Board on Ebay

Hi Don,

Well, the LED's on top should help. Upon Reset, the BOOT ROM led should be on.
When you click run, that LED will turn off and the SD Card LED should flash like it's being accessed.

I drew up a diagram for serial cable connection... I'll check if it's on the wiki, but for now, please find attached.

Regards,
Josh

Date: Mon, 10 Nov 2014 16:09:23 -0800
From: ilv...@gmail.com
To: n8vem...@googlegroups.com
Subject: Re: [N8VEM-S100:5553] ALTAIR-IMSAI 8080 CPU Board on Ebay

Thanks Josh,

That could be useful.

My board is not working. Thinking it might be a simple serial cable
problem.

On 11/10/14 04:01 PM, Crusty OMO wrote:

Hi Don,

No, it needs the front panel for:
-MWrite generation
-Reset
-Run

I am thinking of adding those functions on a jumper selection for version 2, thus making a self contained CP/M board.

Cheers,
Josh
Date: Mon, 10 Nov 2014 15:40:12 -0800
From: ilv...@gmail.com
To: n8vem...@googlegroups.com
Subject: Re: [N8VEM-S100:5550] ALTAIR-IMSAI 8080 CPU Board on Ebay

Josh,

Will you 8080 board work without a front panel installed?

On 11/ 9/14 09:17 PM, Crusty OMO wrote:

Hi Group,

Well, I put up one of these boards fully built and tested on ebay. I hope to reach some ALTAIR / IMSAI owners that may want to bring their system out of the closet. If anyone is interested in following the auction, it's ebay item # 251712707885
I hope it will come up on searches... I couldn't figure out how to make it "International shipping".

Hopefully, it will drum up some interest in N8VEM too.

Cheers,
Josh

PS. Tom,

I do not have John's Propeller Board. Perhaps John has a blank sitting on the shelf with my name on it?
I could probably write support for the board, but, it would be difficult for me to debug without a board to test with.

Cheers,
Josh

Date: Sun, 9 Nov 2014 18:52:22 -0800
Subject: Re: [N8VEM-S100:5544] ALTAIR-IMSAI 8080 CPU Board, BOM errors
From: laf...@lafleur.us
To: n8vem...@googlegroups.com; crus...@hotmail.com

Josh...

Do you supports John's Propeller Driven Console-IO Board
on the 8080 board CP/M image?? if no, is this something your planing on adding??

ADDING THIS WOULD MAKE A GREAT TWO BOARD SYSTEM...

Thanks

On Sun, Nov 9, 2014 at 6:00 PM, Crusty OMO <crus...@hotmail.com> wrote:

I don't have a lot of cards, but I'm primarily using a DANE-ELEC 1GB card, works fine.
I also tried a Kingston 4GB Micro SD (with the SD adapter) - does not work.
Another one that simply says "MICRO SD" on it, which is a 2GB Micro SD with an adapter, does not work.

Another that only has "MINI SD" written on it, which is a 2GB Mini SD with Adapter does work.

I recently bought some cheap cards from China, the ELITE PRO 1GB Memory Card, they work.

They all work ok on my PC, I'm guessing there's some init process that I'm not doing correctly for these larger cards. It's not worth my time to solve the mystery, I just recommend people use 1GB or smaller.

Cheers,
Josh

Date: Sun, 9 Nov 2014 16:31:45 -0800
Subject: Re: [N8VEM-S100:5540] ALTAIR-IMSAI 8080 CPU Board, BOM errors
From: laf...@lafleur.us
To: n8vem...@googlegroups.com

Josh...

what brand and size of SD cards have you tested with ??

thanks

On Sun, Nov 9, 2014 at 12:30 PM, Crusty OMO <crus...@hotmail.com> wrote:

Hi Group,

Well, the moment has come for me to stand up and admit I'm an idiot!

This has come after a long search and struggle to find out why CP/M 2.2 would not save files correctly.

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.

I even thought my CP/M image got corrupt, and Rich Cini was very kind to send me another image. I was hoping the files where different, but that wasn't the problem either.

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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