MFM or ESDI QBUS controller for one PDP-11/23 PLUS

[Jerome H. Fine]

 >Sergio Pedraja wrote:

>Hi, Allison.
>
>I'm perplexed.  The RQDXn controllers are MFM and Floppy.  Best shot
>  
>
>>is late firmware RQDX3 as it does RX33 and most all MFM drives.  Its
>>also easier to find.
>>
>At least as I can remember, the RQDx3 needs an internal distribution panel.
>I'm searching for ONE single board.
>
Jerome Fine replies:

Then perhaps you can describe your other hardware - backplane
with power supply.  Do you have a BA23 or a BA11 box?  Or
something else?  What about the serial ports, etc.?

I agree that the RQDX1, RQDX2 and RQDX3 require a distribution
panel of some sort to change from the 50 pin cable to the
34 pin / 20 pin cable required by MFM hard drives and floppy
drives.  That panel is usually part of a BA23 box.  A BA123 box
uses a distribution board which can handle 4 drives, but the
hard drives also require an additional READY / WRITE PROTECT
(very small) panel.

As far as I can remember, the only controller that I have
ever used with an RX33 was a DEC "late firmware RQDX3" as
Allison has noted.

Probably a 3rd party controller like the Dilog DM01 is what
you are looking for.  But I suspect that these days, an RQDX3
is probably more easily found - except for that internal
distribution panel which is also required if you are using
a BA11 box.

Let us know about your other hardware so that we can help a
bit more.

Sincerely yours,

Jerome Fine
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