25 Oct
2005
25 Oct
'05
11:22 a.m.
On 10/25/2005 at 1:59 PM Allison wrote:
The 765A was least integrated but with the right
external support more
flexible than the 37C65 and later.
You still have to put up with the "blindness' during the IAM interval and
the lack of support for MFM 128-byte sectors--and the lack of support for
non-standard address marks (not at all uncommon in old formats). At least
with the WD chips, you can read the raw track data.
The data seperator was a fairly simple circuit and
could be done with
a counter or for improved results with a latch and prom.
Or just find a nice little 8-pin WD 9216 data separator. If you wanted
more than that, a PLL might be the ticket.
Cheers,
Chuck