On 1/4/2021 5:40 PM, Chris Zach via cctalk wrote:
Can someone check to see if a RQDX2 used the Western Digital chips to
interface to MFM drives?
There's certainly nothing obviously Western Digital.
The board has a bunch of 74LS logic, several PALs, two 27128 EPROMs for
firmware, and one 40 pin IC which is a T-11. Part number 21-17311-01,
which checks out, for that chip.
Bus interfaces - DC005, DC003.
Looks like random logic to interface to the drives, with the T11 doing
the heavy lifting along with a bunch of PALs.
-Rick
