April 2, 2023 – The “D” Part of XDROM Disassembled

While Frank Durda IV developed his custom aftermarket ROM, XROM, he used the extra space in a 16K ROM to add a diagnostic ROM. That ROM is invisible to the system unless a jumper is used.

A detailed disassembly of the diagnostip portion of the XROM is now available on this sites’ Model 4 ROM Explained – XDROM – Diagnostic Part page.

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