FDCs (was: MITS 2SIO serial chip?

From: ajp166 <ajp166_at_bellatlantic.net>
Date: Mon Dec 17 22:33:03 2001

From: Fred Cisin (XenoSoft) <cisin_at_xenosoft.com>


>There ARE many things that the WD will do that the NEC won't, including
>writing much sooner after the index pulse, IGNORING certain fields in
the


765A writes or read sonner than base 765 and the 37c65 even shorter.

It doesnt ignore fields in a multisector read/write however if the
sectors
are written with a interleave it will also keep things in numerical
order.
Add to that a full cylinder read does not bring all the non data crap
that formatted media requires to marks all the data spaces. The real
beauty
of that is if you have real DMA you can fire it up and read a whole
cylinder
and all your buffer has is neatly ordered data if the read was
successful.
That latter feature is nice if your doing a caching scheme.

>Allison could probably gives us a more comprehensive and authoritative
>list.


Yes I can.

Allison
Received on Mon Dec 17 2001 - 22:33:03 GMT