GM 747 EPROM

[Ludis Langens]

Jove Malcolm wrote:
> 
> For the GM 747 EPROM, I noticed all the images are 4096bytes (32Kx8 bits).
> Does this mean the 13th address bit (most significant) is not used? If this
> is the case, is it connected to the computer, or would it be possible to
> burn two 32Kx8 images to a 64K eprom, and use a simple logic high/log on the
> A13 pin to select which image to use.

No, no, no - the '747 uses a 32K bit (not x8 bits) EPROM.  The 2732
EPROM contains 32K bits which is 4K bytes.  Thus the 4096 bytes fill up
the EPROM fully.  A 2732 has address lines A0 through A11.

If you want to put multiple images into one (larger) EPROM, then, yes,
that's possible.  You'll have to make an adapter to go from 28 pins down
to 24 pins.

-- 
Ludis Langens                               ludis (at) cruzers (dot) com
Mac, Fiero, & engine controller goodies:  http://www.cruzers.com/~ludis/


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