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Re: [N8VEM-S100:3592] Re: Run of Dual CF-Card/Hard Disk IDE S-100 Boards

It's the V2a board that Ed just mailed out this week.

I've also tried decreasing the pull up resistors on the 7403's to 330 ohm.

I noticed that David Fry has suggested using a 74S03 in his notes, unfortunately I don't have any here to try.

- Gary

On Saturday, May 10, 2014 12:36:15 AM UTC-4, monahanz wrote:

Is this the older V2 board or the newer V2a board





From: n8ve...@googlegroups.com [mailto:n8vem...@googlegroups.com] On Behalf Of gek...@gmail.com
Sent: Friday, May 9, 2014 9:24 PM
To: n8ve...@googlegroups.com
Subject: [N8VEM-S100:3592] Re: Run of Dual CF-Card/Hard Disk IDE S-100 Boards


Assembled a dual IDE board this evening, and am having an interesting problem.

I'm using 2 Syba IDE-->CF cards with 128mb CF Flash (have also tried some 4mb Kingston types).

If I output directly to ports I can control the hex display and select drive "A" or "B", although the "A" and "B" drive LED's seem reversed.

Using MYIDE.COM it will only initialize if both drives are present, and then I can't select drive "B" from the program.  It will access and format drive "A" just fine.

I've tried swapping 74LS03's out, and changing them to 7403, 74LS38 and 7438 types with no improvement.  I've also swapped out every other chip on the board, and resoldered everything.

Any ideas of where to look?

- Gary

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