KIM-1

@kim-6502.bsky.social did:plc:bvov6bptqbqdupr7m4khwwug

The KIM-1 and classic 6502 related topics. Zero page FTW!

Sur Bluesky depuis le 14 janvier 2025

Résumé

KIM-1 (@kim-6502.bsky.social) est sur Bluesky depuis le 14 janvier 2025. Le compte a 657 abonnés, suit 1 070 comptes et a publié 925 posts.

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Vin 😺💜@vinscool.bsky.social02/11/2026 14:26
I love the unconditional branches to save few cycles and bytes.
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Simon Harris@simondo65.bsky.social02/11/2026 14:26
Bxx +0 (where xx is one of the conditions EQ, NE, CC, CS, etc) just branches to the next instruction, so effectively does nothing. But untaken branches are 2 cycles, taken are 3 (4 if a page is crossed) Are there any real-world examples of where Bxx +0 was used as a programmable length NOP?
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bflmouse.bsky.social@bflmouse.bsky.social02/11/2026 14:26
Been there, done that. It's not fun. You _can_ use a zero in the code hidden in a REM statement. It just has to be the last byte in that statement, and you cannot use the following five bytes for anything, so the zero has to be data, not part of an instruction.
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Vin 😺💜@vinscool.bsky.social02/11/2026 14:26
Yes, the BRA instruction, what I meant to say was simply using the cleverly programmed branches that were guaranteed to always be taken, which effectively provided the same outcome. eg: Carry Set before branching, Overflow Clear, etc.
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Simon Harris@simondo65.bsky.social02/11/2026 14:26
You had to wait for the 65C02 for those. Although they did previously exist on the 6800. The 6800 also had BSR (branch to subroutine) which made position independent code easier as long as your subroutine was within 127 bytes.
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