What's the difference between a 2732, 2732A, 2732B and 27C32? I think the "C" version is CMOS, but I'm not sure. I have no idea what differentiates the other three. Anybody know?

Ken

 

In a nut shell the programming read voltages. If your trying to program an unknow eprom start with the lowest voltage first. If it doesn't program, erase it even if it still looks blank, and try again at one step higher voltage. The B's at least for me have been B*tches at times to program

 

I think I found it with your hint of the programming voltage differences; I pulled up my PB10 software and found this:

Chip - Vpp
2732 - 25v
2732a - 21v
2732b - 12.5v

I assume they have the same pinouts as you said, just different Vpp programming voltages. They all have the same Vcc - 5v. The Vpp values were consistent across manufacturers, also.

Ken

 

Daz it.
When using an unknow, always start with the lower programming voltage.

Also, when reading a memcal if unknow try the larger sizes first. Might try that anyway so you can develope a feel for what misread proms look like. Gets easy to do but takes gettting used to.
HTH

 

So what I'm still fuzzy on is, can a regular 2732 be used in place of an A/B/C?

 

I believe so. Like is mentioned above, no real differences other than programming voltage. However, you'll find the 2732A's in the best supply I think.

Ken