RR problems

[ScarabEpic22]

All the "512k" PCM's I have seen have a 1MB memory in them.

I have seem most all PCM's with 28F800's, only Black Box PCM's and some Northstars personally I have seen with 28F400's. And those have had 256k programs in them.

Wow, ok didnt know that! Why would GM waste the $$ putting 1MB chips and only using half of the space? I bet they didnt need to do much to change to 1MB OSs. Dont most of the 1MB OSs have ETC?

[N0DIH]

I honestly don't know. Paul might know. Maybe there is some additional use of the other memory locations. Say VIN or CASE Learn or LTFT values or maybe even ASPARK values.

Not sure completely, but IIRC the "1MB" PCM's have 28F800's too, so maybe the PCM supplier got good prices on it that way, or maybe there was a problem with the supply of 28F400's so they had to use 28F800's. No way to know at this point.....

Wow, ok didnt know that! Why would GM waste the $$ putting 1MB chips and only using half of the space? I bet they didnt need to do much to change to 1MB OSs. Dont most of the 1MB OSs have ETC?