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bgmusic: add brief README

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Vince Weaver 2020-11-05 17:16:23 -05:00
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commit 2b97a29936
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plays music in the background via the pt3player
loads high to $6000 to try to stay out of the way of BASIC
disk activity might mess with the interrupts. Might be OK on
an Apple IIe but the sound will glitch
Tries to avoid zero page addresses but still uses 8 of them.
Hopefully only stomping on Integer BASIC and Sweet-16