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3

If you want to print a string (terminated with a NUL (000)) suggest the following: string: .asciz "the quick brown ..." mov #1000,sp ; init stack mov #string,R0 ; pass string as argument jsr pc,Print ; to Print function ... Print:mov r1,-(sp) ; save R1 br 20$ ; jump to NUL test 10$: ...


3

Although the CDP1802 was implemented as a single chip, a preceding version was implemented as two chips. I don't know exactly how functionality was split, but the architecture would have been very amenable to subdivision into two chips--one of which would hold the 4-bit P and X registers along with the sixteen numbered 16-bit registers and the logic to ...


2

I'm only guessing, but I would guess in the late '70s and early '80s either RSTS/E for traditional timesharing use RSX-11M for real-time application use; maybe this transitioned to RSX-11M-Plus as larger memories became common I have no data for this, just an impression of what was going on in DEC while I was there. I'd be interested in numbers if ...


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