UniBone: Linux-to-DEC-UNIBUS-bridge, year #1

Rob Doyle radioengr at gmail.com
Sat Nov 23 21:05:32 CST 2019

On 11/23/2019 2:10 PM, Noel Chiappa via cctalk wrote:
>> From: Rob Doyle
>> Your memory is correct. The RH11C was the buffered version of the
>> RH11
> Umm, both the -AB and -B have FIFOs - confirmed from the prints. (I
> have an M7294 if we want to confirm that the prints aren't confused.)
> Now, maybe the -C has a _bigger_ FIFO (e.g. large enough to hold a
> complete sector), I could definitely see that.
> What's your source - I'd like to study/cite it? The only KS10 prints
> I can find don't show the RP11-C?
> Noel


Well.  I think you right about that.   I compared the M7294 in the -AB
to the M7294-YA in the -C and they have the same size FIFOs.

Apologies.  I think I was told that incorrectly.

However there is plenty of DEC documentation that mentions that the
RH11C has a "bus hog" mode for the KS10 disks so that the Unibus can do
back-to-back 18-bit transactions.



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