Can I only use a 27C256 eprom to program a honda ECU, or would a bigger capacity eprom, such as the 27C512 or bigger work? I need to know quickly!

 

i only use the 27C256, try and get chips 200ns or below or you might see lag.

 

here is a link to the pinout of the 27c256:
http://www.xs4all.nl/~ganswijk/chipdir/pin/27256.txt

here is a link to the pintout of the 27c512
http://www.xs4all.nl/~ganswijk/chipdir/giicm/27512.txt

as you can see, pin 1 is different depending on which chip you use, so in order to use the 512, you would need to rework the eprom socket...

and here are links to the data sheets for each part:
http://www.mills.edu/ACAD_INFO/MCS/C...s/cy27c256.pdf
http://www.electronicaestudio.com/docs/27c512.pdf

after looking through the data sheets quickly, i wouldn't use the 512 part...

 

Exactly what I was looking for. Thanks!