From mboxrd@z Thu Jan 1 00:00:00 1970 From: pete@dunnington.u-net.com (Pete Turnbull) Date: Sun, 20 Jan 2002 18:31:24 GMT Subject: [pups] 2.11BSD disklabel-programm In-Reply-To: Jochen Kunz "Re: [pups] 2.11BSD disklabel-programm" (Jan 20, 18:45) References: <200201192135.g0JLZ0N01772@unixag-kl.fh-kl.de> <10201201457.ZM10594@mindy.dunnington.u-net.com> <20020120184541.A50971@krumm.unixag-kl.fh-kl.de> Message-ID: <10201201831.ZM10867@mindy.dunnington.u-net.com> On Jan 20, 18:45, Jochen Kunz wrote: > > Ahhhhh! My PDP 11 has this M8192 board with FPU but without ROMs... > I thought that this is the "original" 11/73 CPU. But on this PDP is > nothing "original". The BA23 was a MV II, the CPU was EPayed, the RAM > board was given to me by a friend. (Many PC/XTs had to donate there RAM > chips to fill it.) About the best use I can think of for a PC/XT :-) > I found the console SLU at the scrap yard, the Dilog > ESDI controller was EPayd (in England BTW ;-) ) ... and I am still > looking for a ROM card... If you can find an MRV11-D (to put MXV11-B ROMs into) or an MVX11-B, that would be the best option (and the only ones DEC supported). However, it should be possible to put the code from MXV11-B ROMs into several 24-pin 2Kx8 EPROMs (2716 or equivalent), and put the EPROMs into a BDV11. However, you'd want to modify the BDV11 for 22-bit operation (that's ECO 005). > > The BA23 was only rated for one hard disk and either a TK50 or an > RX50, > I know. I once saw a MV II with a second RD54 in an external case. There > was a real mess of wiring to get it and the internal RD54 work together > on one RQDX3. Puting the TK50 out of the BA23 and mounting the second > RD54 in the BA23 would have been much simpler. But not the DEC way of > live. ;-) Because old hard drives take a lot of current. The PSU and wiring loom won't take a full backplane and two hard drives. I did one of mine a different way. I have a BA11-N with the backplane modified to be 22-bit. In it is an RQDX2 (or an RQDX3, depending on what's been shuffled around this month), with a 50-way ribbon cable going to a DEC box (used to be a TKZ50) which has a PSU, a hard drive, and an RX50. In the box is also a small PCB I made to do the job of the distribution board found in a BA123. Also in the BA11-N backplane is a modified BDV11, with a pair of 28-pin EPROM sockets which normally hold microPDP-11/23 boot ROMs. -- Pete Peter Turnbull Network Manager University of York