PROM Size on a 165

[Bruce Plecan]

Double load the 128 image in the 256 and be done with it (er go for it)
Bruce



> Newbie working on a 165 ECM.  I have many 256 PROM's but no 128's.  I'd
like
> to put the 256's to work.  The schematic's I have seen on ECMGUY's site,
> show what looks like PROM pin 27 wired to A14 of the ECM bus.  (CS and OE
> are also reversed)  This does not make sense.  Pin 27 of the original 128
> PROM is /pgm pin, which should be tied high in the ECM.
>
> I'm guessing the schematic was made from a later version ECM that takes
256
> PROM's.  (Hense the A14 connection.)
>
> Does the MEMCAL not interface w/ A14 on the ECM board?  i.e. Does the
MEMCAL
> tie PROM pin 27 high?  Can someone confirm that PROM pin 27 on a 165 ECM
is
> held high all the time?  Will using a 256 part for a 128 ECM cause error
> conditions for certain BIN editors?  i.e. Do the editors check this?
>
> I apologies if this has been discussed before, I have not yet found the
> archive seach.
>
> ML
>
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