Disk imaging with IMD - question

rich.cini at verizon.net rich.cini at verizon.net
Wed Aug 9 15:29:05 CDT 2017

I don't have the screen print handy but if you look on Dave Dunfield's site under Disk/Software he has a controller registry. I'm using the Adaptec AHA-1522A which uses the National DP8437AV chip. 


Sent from Verizon/AOL Mobile Mail

On Wednesday, August 9, 2017, Chuck Guzis via cctalk <cctalk at classiccmp.org> wrote:

On 08/09/2017 12:41 PM, Fred Cisin via cctalk wrote:

> My naming convention is flawed. I think that at one point Western
> Digital made an "NEC compatible" controller, that isn't what I call
> "wd-style"

Yup, the WD37C65. Anyone need any? I've got a tubeful that I'm never
going to use. Used in the 8-bit ISA WD1002A-FOX controller board--and
a number of other similar ones, such as the Sysgen Omnibridge.

Downside of this particular chip is that it uses two crystals (an 8MHz
and a 9.6MHz one), unlike later "PC-AT controller on a chip" ICs, that
generally used either a single 24 or 48 MHz crystal.

Patterned, as Fred said, after the NEC uPD765/Inel 8272 and very unlike
the WD 17xx and 27xx chips.

Rich, you said your setup passed fdtest. Specifically, what portions of
it? It's a rare FDC that will pass all of the tests.


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