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VectorGlow
10th May 2009, 09:35 PM
Symptom: Many letters displaying the wrong letter and some background graphics corrupted
Diagnosis: The test mode didn?t have a very comprehensive RAM test so swapped in the ROM board, protected 68000 and IC4 from Moonwalker and ran that. The Memory Test indicated that RAMs at IC33, 34, 35 and 36 were faulty, but in fact the LS374 at IC37 had bad outputs

Layout of RAM IC tests for Moonwalker running on this board:

IC5 IC6
IC16 IC17
IC33 IC34
IC35 IC36
IC41 IC42
IC69 IC70

Written down the above as with the wrong letters being used in some cases it was hard to make out what was being displayed, so also ran the test on Moonwalker itself to determine the layout.