Quote:
Originally Posted by SiriusHardware
As you might expect, the location which now changes randomly in the upper screen area is 0F31. The range of 'random' characters has the same small range as before - characters whose codes end in 'F'.
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Which tells me that when the spurious writes are happening, the data bus is not being driven, as D0-D3 are pulled up to +5v with 1.2k resistors and D4-D7 are just floating. I suppose you could pull up D4-D7 with some resistors to verify this....