Dec RQDX: What kind of chips on it?

Rick Murphy rick at
Mon Jan 4 18:12:38 CST 2021

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.

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