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Cool: Apple mini-assembler found inside Woz’ monitor inside Apple II Integer Basic

Posted by jpluimers on 2021/01/18

From a while back: [WayBack] This week, a mini-demo of the mini-assembler found inside Woz’ monitor inside Apple II Integer Basic. CALL –151 F666G … – mos6502 – Google+

This week, a mini-demo of the mini-assembler found inside Woz’ monitor inside Apple II Integer Basic.
CALL –151
F666G
You can find reconstructed sources in Jeff Tranter’s repo here:
https://github.com/jefftranter/6502/tree/master/asm/Apple%5D%5BMonitor
where we see credits to Steve Wozniak and Allen Baum. But in this oral history it seems the assembler was Baum’s work:
“Baum: So it was brute force, very simple and fit into 256 bytes if you already had the 256-byte disassembler.”
https://youtu.be/wN02z1KbFmY?t=3941
Anyhow, one page of code – or two – is very impressive!

For more info, try searching for F666G! (We wonder at this memorable address – the Apple I price was $666.)

Related:

–jeroen

 

 

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