6 Apr
2013
6 Apr
'13
5:59 p.m.
On 04/06/2013 01:20 PM, Tony Duell wrote:
I am not on the forum (AFAIK), if you (and others)
expect that all of
us are both on the forum and this list, I have to ask what the point is
of having both. And if I am not jus the only person to be on the mailing
list and not the forum, I think it's hardly suprising that there will be
replies on one that are very similar to replies on the other.
That happens quite a bit, Tony. Erik's VCF tends to be oriented more
toward personal microcomputers (IBM-style PCs, Apple, Commodore, etc.)
although some more unusual stuff does show up, such as the guy
reconstructing a Honeywell H200 system.
Incidentalyl, one machine, I think it was the
Rainbow, had a little
state machine using a bipolar PROM and a bit of TTL on the FDC board.
This was not anythign to do with write precompensation. Instead, it
encoded a spare ynchronous serial channel into MFM. This was then sed to
verify the operation of the FDC chip during the POST. NEver seen anyone
else go to those lengths,
I misspoke in my earlier post (I had something else on my mind). The
subject PROM is part of a data separator circuit. It's been suggested
by one poster that it might be simpler to replace the 2-chip separator
with a WD9216. But that wouldn't be any fun...
--Chuck