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GeneralRe: Vectrex Pin
CodeWraith3-Jul-22 19:04
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CodeWraith3-Jul-22 18:56
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DerekT-P4-Jul-22 5:24
professionalDerekT-P4-Jul-22 5:24 
GeneralRe: Vectrex Pin
John Wellbelove5-Jul-22 13:30
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GeneralRe: Vectrex Pin
Andreas Mertens3-Jul-22 16:26
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GeneralRe: Vectrex Pin
CodeWraith3-Jul-22 18:48
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GeneralRe: Vectrex Pin
Richard Andrew x644-Jul-22 4:06
professionalRichard Andrew x644-Jul-22 4:06 
GeneralRe: Vectrex Pin
trønderen4-Jul-22 8:13
Membertrønderen4-Jul-22 8:13 
At the time, I was fascinated by the 9900 chip (the CPU, not the 9918 graphics chip), having all 'registers' in memory. At an interrupt, you could swap context completely simply update the "Workspace Pointer" to another complete register set.

The bad thing was of course that register operations were no faster than memory operations, so all things considered, the chip was terribly slow. But interrupt handling was terribly fast!

Sometimes, when I dig up memories of those quite different solutions that were ditched, I can't help but wondering: What if someone took up the ideas today and modernized them? A 9900 model 2022 would of course be a 32 or 64 bit chip, and I assume it would be built with a caching mechanism for the register blocks. Maybe, for some application areas were super fast interrupt handling was essential, and "unlimited" number of threads was a valuable property, that idea of just setting a pointer to the appropriate register block might have some merit!

(I have worked on a machine with something resembling it: Interrupts were prioritized into 16 levels; a high level could suspend a lower one. Each level had its own physical register set. The first instruction of the interrupt handler started executing 900 ns after the arrival of the interrupt signal, which was rather impressive in the mid 1970s, when these small 16 bit minis (PDP-11 class) where developed and sold.)
GeneralRe: Vectrex Pin
Richard Andrew x644-Jul-22 8:22
professionalRichard Andrew x644-Jul-22 8:22 
GeneralRe: Vectrex Pin
trønderen4-Jul-22 15:21
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GeneralRe: Vectrex Pin
BBar25-Jul-22 18:42
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GeneralRe: Vectrex Pin
CodeWraith4-Jul-22 8:58
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JohnDG525-Jul-22 1:58
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GeneralRe: Vectrex Pin
maze35-Jul-22 2:29
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Mike Hankey3-Jul-22 11:08
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Richard Andrew x643-Jul-22 11:24
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Mike Hankey3-Jul-22 11:59
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GeneralRe: Vectrex Pin
obermd3-Jul-22 13:32
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GeneralRe: Vectrex Pin
trønderen3-Jul-22 18:52
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GeneralRe: Vectrex Pin
Mircea Neacsu3-Jul-22 13:55
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CPallini3-Jul-22 20:15
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jmaida3-Jul-22 16:28
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GeneralRe: Vectrex Pin
jmaida3-Jul-22 16:30
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GeneralRe: Vectrex Pin
CPallini3-Jul-22 20:19
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Daniel Pfeffer3-Jul-22 21:39
professionalDaniel Pfeffer3-Jul-22 21:39 

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