RE: [N8VEM-S100:5509] Problem with ALTAIR-IMSAI 8080 CPU Board

Thanks Fabio, that's good news to hear other successful reads of the SD card. I say so, because when I was writing the code, I found a lot of confusing guides and examples of how to initialize the SD cards. I learned that not all SD cards are the same! Some are as different as Cars that use Gasoline vs Diesel vs Propane vs Electric. On the outside, they all have 4 wheels, doors, etc, but under the hood, they are quite different.

Cheers,
Josh

Date: Sun, 2 Nov 2014 23:54:23 +0100
Subject: RE: [N8VEM-S100:5509] Problem with ALTAIR-IMSAI 8080 CPU Board
From: hkzl...@gmail.com
To: n8vem...@googlegroups.com

Hi Josh.
Using a 256mb sandisk SD card here. No problems initializing and reading from the drive.
Did not try writing yet, as I mostly upload binary code directly into ram using the monitor for my code experiments.

On Oct 31, 2014 2:06 PM, "Crusty OMO" <crus...@hotmail.com> wrote:

Group,

To add to Harold's post, we've been directly emailing each other, trying all the things I can think of. Here's what I know thus far.

All the SD Cards are talking back but at a 1.5V range, not the 2.5V that I measure on my board.
He verified there are no shorts on the SD Data out to the 74LS299
He replaced the 74LS299

I'm awaiting some (inexpensive) 1G SD Cards from ebay, when they come, I'll try them on my system and if working, send one to Harold. But while we are waiting, it would be interesting to hear back from other builders on their experiences with the SD card.

Cheers,
Josh Bensadon

> Date: Thu, 30 Oct 2014 05:40:18 -0700
> From: n8vem...@googlegroups.com
> To: n8vem...@googlegroups.com
> Subject: [N8VEM-S100:5471] Problem with ALTAIR-IMSAI 8080 CPU Board
>
>
> 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.
>
> Thanks,
>
> Harold
>
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