Dec RQDX: What kind of chips on it?

[Rick Murphy]

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