17 Jan
2017
17 Jan
'17
12:18 p.m.
On Jan 17, 2017, at 12:58 PM, Alan Frisbie
<Flash688 at flying-disk.com> wrote:
I just joined this list, so I'm not sure which of the items I own
would be considered by this group to be rare or unusual, but here
goes?
Hi Alan,
Nice to see you on the list. If memory serves me correctly, you presented
a talk on (very) high speed data acquisition at DECUS a few decades ago.
DEC RKV11D Q-Bus controller for RK05 disks (on my
LSI-11/73 system)
Originally, it only supported 16-bit addressing, but I added the
chip and wires to make it support 18-bit addressing. I have never
even heard of another of these controllers, so I assume it is rare.
There was also a third party Q-Bus controller that handled 18 bit DMA.
I don?t recall the vendor, but I remember using in on Diablo RK03?s.
I once upgraded a DEC DR11B in a smilier fashion. It was 18bit addressable,
but would not transfer across a 32Kbyte boundary. After reviewing the prints
it turned out to be very easy to add another counter chip fix this. I glued to another
chip dead bug style (downside up) and soldered a few wires. I always liked
the ability to improve things.
I recently retired, so my #1 job now is getting rid of all the stuff
I accumulated over my almost 50 years in the computer industry. I
have three rental storage units full of stuff and the cost is
killing me! Is it OK to post ads on this list?
Alan Frisbie
I actually accumulating more as I semi-retire. If they don?t let you
post, let us know where you will be listing things.
Regards,
Jerry
jsw at ieee.org