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In the kinds of embedded applications for which the CPU was expected to be used, I wonder how the cost and usefulness of making BIT affect the V and N flags directly compared with the cost and usefulness of having all instructions where the two bottom bits of the opcode are 11 behave as a "branch on special input" instruction, and then having systems use external hardware to add up to 64 system-specific input/output instructions (instructions that should perform output would refrain from asserting the special input).

supercat
– supercat

2021-12-22 21:33:18 +00:00
Commented Dec 22, 2021 at 21:33
1

Thanks, it's been updated with the archive.org backup

Kelvin Sherlock
– Kelvin Sherlock

2024-09-30 11:50:34 +00:00
Commented Sep 30, 2024 at 11:50

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