Questions tagged [rca-1802]

Use this tag for questions related to the RCA 1802 and related CPUs.

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20 votes
2 answers

How did the RCA1802 'call' and 'return' instructions work?

The RCA 1802 processor was used in a number of systems such as the ELF and COMX-35, and also apparently in the US space program (with its hardened variant). From memory, it had a rather unusual set ...
3 votes
1 answer

`DRAW` instruction timing

I asked a question here about CHIP-8 instruction timing, and this answer mentions that DRAW waits for vblank: For Chip-8 code that draws anything, the limiting factor will be the wait-for-vblank that ...
3 votes
3 answers

Effective speed of original COSMAC VIP CHIP-8 interpreter

The original CHIP-8 interpreter ran on RCA 1802-based kit computers and home computers, most notably on the COSMAC VIP. Some of the CHIP-8 opcodes are complicated and involve many memory round-trips, ...