CEI 903 Diagnostic prom?

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SolidSilver:
Been collecting CEI 903/904 gaming software, anything I can get that is different from the usual v23.9 with 94% RTP,
just to make sense of it all. If/when I acquire enough varieties, I will publish the list on NLG.

Have been offered a "903 Diagnostic" prom. Any idea what it does, how it's used, and if I
need additional proms or hardware to use it?

dormi:
903 diagnostic PROM is for testing the 903-904 logic board.  Diagnostic PROM is inserted into U9 socket, CGO U67 needs to be in place.  The rest of the PROMS can be in place or not.  It is a very handy tool for board repair.  There is another test PROM for 905 boards.  Anyone know if there is one for 906 boards?

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