[HECnet] PDXVAX - 40MB Memory - VAXstation 4000/VLC?

On Mon, Oct 19, 2009 at 07:17:18PM +0200, Johnny Billquist wrote: You don't do DMA from CPU to a device. Remember what DMA stands for? :-) Oh, duh. I knew that. I blame a lack of coffee. ;) Hmm, I realized one thing, though. With a common Qbus, all interrupts will probably go to the bus master arbiter, which means that all devices actually must be attached to CPA, except such devices that are local to each CPU, such as the console terminal. That solves that problem. :) And in RSX speak, the CPUs are called CPA, CPB, CPC and CPD. Here is how it looks on MIM:: .con dis full att for sys SYS SYS Online,Accpath PDP-11/74mP, EIS,UNIBUS_Map,D-Space,SWR,Cache,FPP, Clock=KW11-L, $TKPS=50., $TTPRM=000002 .con dis full att for cp CPA CPA Online,Accpath Cache_control=000001, Timer=Off, Alarm=Off CPB CPB Offline,Accpath Cache_control=000001, Timer=Off, Alarm=Off CPC CPC Online,Accpath Cache_control=000001, Timer=Off, Alarm=Off CPD CPD Offline,Accpath Cache_control=000001, Timer=Off, Alarm=Off .con dis full att for du DUA CPA Online,Accpath,Driver Csr=172150, Vector=000154, Pri=000005, Urm=000001 DU0: CPA DUA0: Online,Accpath,Context,Driver,Type=RZ29 DU1: CPA DUA1: Online,Accpath,Driver,Type=RD53 DU2: CPA DUA2: Online,Accpath,Driver,Type=RD52 DU3: CPA DUA3: Offline,Accpath,Driver DU4: Online,Accpath,Context,Driver,Type=VRA82 . Notice that CPA and CPC are online. And DUA is attached to CPA, and so on... That's nifty. I can't wait to get mine setup. :) -brian -- "Coding in C is like sending a 3 year old to do groceries. You gotta tell them exactly what you want or you'll end up with a cupboard full of pop tarts and pancake mix." -- IRC User (http://www.bash.org/?841435)