The original Apple II reference manual teaches assembly the way the machine expects to be spoken to: through the built-in monitor, one hex byte at a time.
The first program
- Enter the monitor with CALL -151.
- Type the bytes that toggle the speaker in a loop.
- Run it with G and listen to the click become a tone.
The manual assumes you are clever and curious. That is still the best way to write one.
Jonas Leclerc
Typing a program in by hand is slow, but you never forget what each byte does afterwards.
MA
MARA KESTREL
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Member since 2016
6 posts
Tube technician with twenty years on broadcast monitors. Mara runs the Thursday CRT bench and still owns the degaussing coil she built in college.
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Came for the repair, stayed for the tangent about the manual layout.
Rosin flux from a jar, cleaned with isopropyl straight after.
Rosin flux from a jar, cleaned with isopropyl straight after.
Nice work. For anyone reading: the service manual is on page 14 of the archive scans.
Six-month check is on the calendar.
The sound on this one still gives me goosebumps.
Thanks! The shield photo took about twenty attempts.
Honestly the composite version has a charm the RGB one lacks. Fight me.
This is exactly the write-up I needed before opening mine. Bookmarked.