[sebhc] Re: Re-creating actual floppies from archive

Lee Hart leeahart at earthlink.net
Thu Mar 30 15:05:53 CST 2006

>> The original cards had a timing problem; they worked with old parts,
>> but then National "improved" the 8250... The newer chips didn't work
>> reliably in the old card.

Dan Lanciani wrote:
> Did this happen with the H8's serial card as well?

Probably, but the "new" 8250's didn't exist when the H8 was built so it
was never a problem.

> Is a diagram of the change available?

Yes, it's on the H89-A schematics.
Ring the bells that still can ring
Forget the perfect offering
There is a crack in everything
That's how the light gets in    --    Leonard Cohen
Lee A. Hart, 814 8th Ave N, Sartell MN 56377, leeahart_at_earthlink.net
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