On 2012-07-05 23:43, Boyanich, Alastair wrote: G'day Johnny, Okay, then "someone on the internet is wrong" (tm) .. will accept your version of it. :) The internet is wrong most of the time, if you just start digging into enough details. :-) Was going off this site: http://www.cpu-galaxy.at/Boards/Boards_CPU/Boards_CPU.htm ..and a couple of others that've probably sourced it. Yep, the information there is wrong. No CIS for the J11. The only CPUs that ever got the CIS was the F11 and the 11/44. (Now I'm sure someone is going to point out the 11/74 CIS option, but it was never sold, even though I've heard that at least one prototype was done.) Okay, I'll check the 23Plus when I get home. Might get lucky there and be able to have a play with it there. On topic, seems to work in the quick test (sadly had work to do at home) I did last night which was a couple of memory fills so that's promising. Right. So no CIS for 83/94, but there is for 23Plus. Right. Thanks for the straightening out :) No problem. Oh, and I saw some additional discussions about the CIS option for the F11. Unless I remember wrong, and understood things wrong, it is not just a simple PROM. It's a coprocessor, which have logic in addition to whatever microcode the coprocessor need. So no way of just duplicating a PROM to get a CIS. Johnny Al. -----Original Message----- From: owner-hecnet at Update.UU.SE [mailto:owner-hecnet at Update.UU.SE] On Behalf Of Johnny Billquist Sent: Thursday, 5 July 2012 5:45 PM To: hecnet at Update.UU.SE Subject: Re: [HECnet] pdp-11/83-84 On 2012-07-05 09:40, Johnny Billquist wrote: On 2012-07-05 08:22, Boyanich, Alastair wrote: G'day $ALL. Quick question. I've just snaffled an M8190-AE with what I think is the 21-21853-06 FPU as an upgrade for either the 11/70 or 11/23Plus at home. I've seen reference to CIS microcode for these boards about the place and am extremely keen to have a go at it with macro. I'm not "actually" sure if it has it in the PROMS, but being handy with a EPROM programmer hopefully I can find it. Does anyone have any reading material on how to figure out if the CIS microcode is installed ? This CIS option is not a PROM, even though it might sound like that. It's more like a co-processor. If the CIS options is installed, you can easily see that, physically, by the large chips next to the CPU. If it's not there, you have some empty sockets... Oh! And Darn! I should have checked proper. The M8190 is indeed the 11/83 and 11/84 CPUs. That's a J11 CPU. There is *no* CIS for this CPU. I thought you were talking about the 11/23+ and 11/24 in my first reply. Johnny -- Johnny Billquist || "I'm on a bus || on a psychedelic trip email: bqt at softjar.se || Reading murder books pdp is alive! || tryin' to stay hip" - B. Idol