2 Oct
2021
2 Oct
'21
3 a.m.
On Oct 1, 2021, at 8:54 PM, Johnny Billquist <bqt
at softjar.se> wrote:
On 21-Oct-01 15:25, Paul Koning wrote:
Also for RSX. Basically, they both use WAIT, and that's all that is required from
simh. RT-11 is busy-looping, though.
That's what I thought but that's only half correct. RT-11 SJ does busy looping;
RT-11 FB has an idle task that includes a wait instruction (which is how it gets the
rotating lights pattern -- the difference with other OSs is that it sets the pattern into
the display register rather than into R0).
; "A SOURCE OF INNOCENT MERRIMENT!"
; - W.S. GILBERT, "MIKADO"
; "DID NOTHING IN PARTICULAR, AND DID IT VERY WELL"
; - W.S. GILBERT, "IOLANTHE"
; "TO BE IDLE IS THE ULTIMATE PURPOSE OF THE BUSY"
; - SAMUEL JOHNSON, "THE IDLER"
10$: DEC (PC)+ ;THE RT-11 LIGHTS ROUTINE!
20$: 1
BNE 14$ ;NOT TOO OFTEN
ADD #512.,20$ ;RESET COUNT, CLEAR CARRY
16$: ROL 13$ ;JUGGLE THE LIGHTS
BNE 11$ ;NOT CLEAR YET
COM 13$ ;TURN ON LIGHTS, SET CARRY
11$: BCC 12$ ;NOTHING FELL OFF, KEEP MOVING
ADD #100,16$ ;REVERSE DIRECTION
BIC #200,16$ ;ROL/ROR FLIP
12$: MOV (PC)+,@(PC)+ ;PUT IN LIGHTS
13$: .WORD 0,SR
14$: MOVB #MXJNUM/2+200,INTACT ;DO A COMPLETE SCAN
EXUSLK: BR EXUSER ;BACK INTO LOOKFOR LOOP
paul
On Oct 1,
2021, at 4:00 AM, Brian Hechinger <wonko at 4amlunch.net> wrote:
Man I wish we weren't on the Amber list. Such a hassle to travel there right now.
I should get simh fired up on the NUC. I'm thinking something PDP-11 and then
maybe..... RSX? I don't even know what I'd want to run.
Does the PDP-11 stuff properly do idle? The NUC is pretty powerful, why not run several
PDP-11s? :-D
Yes for RSTS, I don't remember RSX, and I don't think so for
RT11.