From the Commodore Modem 300 (Model 1660) User Manual
Just in case any of you were wondering, the code snippet for going on-hook on a VIC-20 is incorrect. It should read: poke oh,(peek(oh) or hi), just like the C64/C128 section. This typo has fucked me over for almost a decade, and it was printed 31 years ago.
Now that I’ve found and corrected the mistake in my code, my VIC-20 auto pulse dialer works now, just like the C64 version.














