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RE: [N8VEM-S100:1507] IDE board BIOS question
> What CF card you using. I and others have found that some behave strangely
> with the MYIDE software. I have no ideas why, perhaps others have
> suggestions. If you are not using one, could you try working with the
> Kingston, Maxell or Patriot 4GB CF cards. They are very common. For
> example had reliability problems with the SCANDISK cards.
I've been using an old SanDisk 192 MB card, but I do have some Kingston
cards and will give them a try. Forget the exact number, but it's one
that you or others listed as tested and known to work.
> Second the reset initialization pulse width to these cards is very
> Are you using a Z80 (10Mhz) CPU, if not adjust the software delay.
It's a 4 MHz Northstar board, but I can increase the delays.
One thing that seems to help is by adding a couple extra lines in the
wrlba function to re-write the head register with the IDE-enable bit set.
That keeps the card in LBA mode.
> The software should work for both the dual and single IDE boards.
> I'm assuming you are using the "MYIDE.COM" program BTW, without
> modifications. Right?
Correct, and I copied the critical functions from MYIDE into my BIOS, such
as the wrlba, all timing/status functions, low-level sector read/write,
I'll swap cards and see if that solves the problem. However, it has been
a good learning experience to debug the BIOS and learn a lot more about