Running the KIM-1 monitor on a 1541 disk drive

Jeremy Starcher

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Dec 29, 2025, 5:43:28 AM12/29/25

to PAL 6502 computer

https://www.youtube.com/watch?v=6loDwvG4CP8

Neil Andretti

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Jan 1, 2026, 6:09:52 AMJan 1

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Dave McMurtrie did it again! What an amazing job. I looked in the monitor ROM he build. There is not a lot working, but nevertheless very inspiring.

jeremy....@gmail.com schrieb am Montag, 29. Dezember 2025 um 11:43:28 UTC+1:

https://www.youtube.com/watch?v=6loDwvG4CP8

Hans Otten

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Jan 1, 2026, 7:24:02 AMJan 1

to PAL 6502 computer

Indeed a fun project. Yes, the KIM monitor is brought back to the minimum to have the serial monitor code working on a 6522. What must have taken a lot of work is getting the timing of the bitbanging finetuned.

Getting the memory map closer to a real kim was not possible with the 1541 memory layout. And so only software assembled from source is usable.

I am very happy to see the KIM-1 monitor working with a 6522!

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