8-Bit Show And Tell | Commodore 64: Opening The Borders (Type-In From Zzap!64 Magazine) @8_Bit | Uploaded October 2021 | Updated October 2024, 12 hours ago.
Let's examine a BASIC type-in from the August 1987 issue of Zzap!64 magazine that allows the Commodore 64's top and bottom borders to be "opened" or "removed" or "killed" or whatever you'd like to call it. Thanks to my patrons that support these extra-nerdy monthly videos.

To support 8-Bit Show And Tell:
Become a patron: patreon.com/8BitShowAndTell
One-time donation: paypal.me/8BitShowAndTell
2nd channel: youtube.com/channel/UCAgWzEh5c8391eJnELDy9OA

ZZap!64 Magazine, Issue 28, August 1987:
archive.org/details/zzap64-magazine-028

End credits music is an instrumental version of the unreleased "You're My Favourite PET" by Bedford Level Experiment: youtube.com/user/BedfordLvlExperiment

Index:
0:00 Intro: Zzap!64 and more
2:53 Typing In Listing
5:11 Debugging
6:14 The borders are open!
9:30 Sprites in the border
12:40 IRQ setup machine code
16:30 The IRQ code - where the trick happens
21:02 More explanation of how it works
26:40 Thanks!