Re: Double Buffer RK11-C

> On Dec 6, 2016, at 2:56 PM, Fritz Mueller wrote: > > >> On Dec 6, 2016, at 7:51 AM, Noel Chiappa wrote: >> >> [data fetch] can't be off-loaded onto a separate interface unit, as it needs >> access to >> register contents held in the CPU. > > Yeah, it’s pretty interesting! My guess would

Re: Double Buffer RK11-C

> On Dec 6, 2016, at 7:51 AM, Noel Chiappa wrote: > > [data fetch] can't be off-loaded onto a separate interface unit, as it needs > access to > register contents held in the CPU. Yeah, it’s pretty interesting! My guess would be that it was a separate register/command oriented interface, sit

Re: Double Buffer RK11-C

> From: Glen Slick > You should also hang out at vcfed forum in addition to hanging out here. I barely have time to keep up with the things I'm already into (actually, strike that - I _don't_ have time to keep up already :-)! So I'm going to have to pass. Interesting about the FP11 stuf

Re: Double Buffer RK11-C

On Mon, Dec 5, 2016 at 6:40 PM, Noel Chiappa wrote: > > From: Fritz Mueller > > > Also, clues about an 11/20 interface for the FP11-B that were noticed > > recently. > > I don't recall this; more details, if possible? Thanks! > > Noel You should also hang out at vcfed forum in

Re: Double Buffer RK11-C

> From: Fritz Mueller > Also, clues about an 11/20 interface for the FP11-B that were noticed > recently. I don't recall this; more details, if possible? Thanks! Noel

Re: Double Buffer RK11-C

> On Dec 5, 2016, at 11:32 AM, Noel Chiappa wrote: > > (This whole process makes me feel like a paleontologist, reconstructing some > unknown dinosaur from a fragment of one bone, using a lot of complex reasoning > from small clues contained therein! :-) Yeah, I find this sort of thing really f

Re: Double Buffer RK11-C

> look at the lower right line of lights on the panel: ... and three bits > of Major State; now look at the RK11-C prints, connector B32: > ... Postamble, Checksum, Data, Header, Preamble. > ... > One thing I have been wondering about is that "RK11-C" - that implies > that t

Re: Double Buffer RK11-C

> From: Fritz Mueller > But then over at bisavers, I see this: Yes, that's the panel I found the picture of in the RSTS-11 brochure a while back: http://www.classiccmp.org/pipermail/cctalk/2016-November/029104.html The picture in the brochure is not very very hi-res, but Al Kossow rec

Re: Double Buffer RK11-C

So, the RK11-C disk controller page over at gunkies says “no [indicator panel] inlay for such has even been sighted…”. But then over at bisavers, I see this: http://bitsavers.trailing-edge.com/pdf/dec/pdp11/pictures/1120_RSTS-11/1120_RK_Panel_RSTS-11.jpg

Re: Double Buffer RK11-C

> I'm working on the prints now. OK, done and uploaded: http://ana-3.lcs.mit.edu/~jnc/tech/pdp11/RK11-C-DB_EngrDrws_Dec72.pdf I haven't had the time to pore over them to figure out exactly what the changes do, but they add two buffer registers (ABUF and BBUF), so they probably offer greate

Re: Double Buffer RK11-C

> Check out the module utilization chart .. On a stock RK11-C, slots 1-8, > rows C-D (the bottom two rows) are empty. ... (I'll be documenting the > added Flip Chips in the Double-Buffered variant 'soon'.) I've added a module chart for the double-buffered variant here: http://gunkie

Re: Double Buffer RK11-C

> From: Ethan Dicks > I haven't even made an inventory of it. What would I look for to know? Check out the module utilization chart, either in the RK11-C Engineering Drawings, or here: http://gunkies.org/wiki/RK11_disk_controller (at the top of the section "RK11-C Board chart/count ta

Re: Double Buffer RK11-C

On Thu, Nov 17, 2016 at 10:09 PM, Noel Chiappa wrote: > > Subject: Does anyone actually have a KT11-B? > > Date: Fri Sep 30 19:04:47 CDT 2016 > > > the ones shown in the images show it to be (mostly) an RK11-C. > > ... > > I say "mostly" because there appear to be extra cards o

Double Buffer RK11-C

> Subject: Does anyone actually have a KT11-B? > Date: Fri Sep 30 19:04:47 CDT 2016 > the ones shown in the images show it to be (mostly) an RK11-C. > ... > I say "mostly" because there appear to be extra cards on the right hand > end; whether those are some sort of upgra