25 Jul
1998
25 Jul
'98
8:33 a.m.
On Sat, 25 Jul 1998, Tony Duell wrote:
Tony, I assume you refer to the UMC8398 - the 48-pin package. Do you
happen to know if this has the same pinout as the NS8473?
- don
**** snip ****
So, can a
standard XT controller be used for 8" drives?
Not normally. The 8" drive uses the higher 500kbps data rate, not the
250kbps used by 360K and 720K (=XT) drives. However, I got a multi-IO
card using a UMC disk controller and replaced the chip with the
AT-compatible version. Also had to change the crystal, and kludge the
addressing logic. Took about 30 minutes, including reading the UMC data
book.