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C64 test rom without cartridge?

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You can burn the Dead Test diagnostic ROM (781220) to an EPROM and replace the Kernal ROM with it. It is made to run from $e000.


It's not a full-blown diagnostic program. As the name implies, it's made to diagnose systems that won't start.

All other diagnostic ROMs that I know of runs from $8000 and requires that a Kernal is in place.

Edited by hofster
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There is no reason you couldn't make a replacement kernal that had the full diagnostic- it just needs relocated/reassembled. 


The dead test is only that way because it uses the Ultimax mode to get control and bypass the ROMs, and that memory map doesn't see all of the hardware.


However, 9.5/10 times the dead test is enough to diagnose the machine.


Edited by R.Cade
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