My patron Simon McCullough will be demonstrating his Commodore PET at the 2026 Indy Classic Computer and Video Game Expo in Indianapolis, IN on March 21-22, 2026. He’s planning on showing the fantastic Commodore PET 4032 demo called "Back to the PET" by shiru8bit, but it just runs once and then stays on the final end screen forever, rather than looping. Is it possible to make the demo loop repeatedly without user intervention? Yes, and we go through that process today.
Indy Classic: https://indyclassic.org/
Shiru’s website: http://shiru.untergrund.net
Programming the PET/CBM by Raeto West: https://archive.org/details/COMPUTEs_Programming_the_PET-CBM_1982_Small_Systems_Services/
Video about the One-Line PET Emulator: https://youtu.be/qWZyv1pomy4
Watch the demo in an online PET Emulator:
https://www.masswerk.at/pet/?prg=back2pet&screen=green&persistence=long&rom=4&ram=32k&autorun=true&sound=true
To support 8-Bit Show And Tell:
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2nd channel: https://youtube.com/channel/UCAgWzEh5c8391eJnELDy9OA
Index:
0:00 2026 Indy Classic Computer and Video Game Expo
0:50 Back to the PET – CAFeParty 2022
7:55 Loading the demo with C64 + PET Emulator
13:47 Examining the demo’s "main script"
24:02 The loop patch: LOADing in ML on the PET
36:17 Testing the patch on the PET 4032
37:41 Thanks!
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