RE: [N8VEM-S100:5540] ALTAIR-IMSAI 8080 CPU Board, BOM errors

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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