Commodore PET 4000 Series Troubleshooting Guide: Difference between revisions

Revision as of 00:23, 16 July 2026 edit Josh (talk \| contribs) Bureaucrats, Interface administrators, Moderators, Suppressors, Administrators 6,546 edits Expand troubleshooting: garbage-screen ROM/RAM + 74LS244, socket reseat, PSU Molex wobble/78L05, video timing, 6545 CRTC; cited (Tynemouth/6502.org) ← Older edit		Latest revision as of 13:00, 16 July 2026 edit undo Josh (talk \| contribs) Bureaucrats, Interface administrators, Moderators, Suppressors, Administrators 6,546 edits Add representative photo (Wikimedia Commons, attributed on file page)
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			[[File:Commodore PET 4000 Series (photo).jpg\|thumb\|right\|300px\|Commodore PET 4000 Series. Source: Wikimedia Commons.]]
	This guide provides a troubleshooting reference for the Commodore PET 4000 Series (models 4016, 4032, etc.). It covers known fault modes specific to the "Fat 40" models with 6545 CRTC, 40-column video, and BASIC 4.0 ROMs.		This guide provides a troubleshooting reference for the Commodore PET 4000 Series (models 4016, 4032, etc.). It covers known fault modes specific to the "Fat 40" models with 6545 CRTC, 40-column video, and BASIC 4.0 ROMs.