> On Jan 17, 2017, at 12:58 PM, Alan Frisbie <flash...@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 j...@ieee.org
