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=== Diagnostic cartridges === * '''Dead Test''' cartridge runs with all ROMs, the SID and both CIAs removed โ the border-flash count identifies the faulty RAM bit. * '''586220 Diagnostic''' cartridge, used with the keyboard/user-port/serial/joystick '''loopback harness''', tests every port and reports pass/fail โ the definitive full-machine test.<ref name="c64svc">[https://portcommodore.com/rcarlsen/cbm/c64/C64_SERVICE_MANUAL.pdf Commodore C64 Service Manual] (Ray Carlsen / PortCommodore); [https://oldsilicon.com/technologies/commodore-64-250407-parts-locator/ C64 250407 Visual Parts Locator], OldSilicon; and [https://www.c64copyprotection.com/commodore-64-chip-set/ Commodore 64 Chip Set]. Source for the IC map, the PLA output-select pins (F1 pin 17 BASIC, F2 pin 16 KERNAL, F3 pin 15 character ROM, F5 pin 12 I/O) and the SID audio pins (27 out, 26 in).</ref>
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