I'm reverse engineering a DSM ECU. The programme memory is a TMS27C256. I
have looked at the datasheet and it specifies that 13V (ish ) is required
for programming. On the board that I have Vpp is tied to the 5V (Vcc)
supply. Now I would have expected it to be tied to GND as there is no
circuitry to switch it higher for ICP. Is there something clever that I'm
missing? I'm sure that a few of you must have experience with this IC.
TIA
James


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