Re: burning proms

Kevin Moore wrote:
> It's been suggested that you can use 93446 proms in place of the 74s287
> and 74s288, by burning the bin on the bottom half of the prom. Since
> pins 13 and 14 of a 74s28x are grounded, you would have no need for the
> CS, and A8 lines on the 93446.

Before you give up on this, try reading the image into a file then using
  dos command shell 'copy' command /B to append it to itself, like this:

copy /B image.bin+image.bin new.bin

Burn that onto the PROM and see if it helps... if you have the whole
chip occupied with consecutive copies of the same image, it shouldn't
matter where the higher select lines are pointing to. This method has
worked for me (though not with this exact chip.)

                                                -Lewis

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Received on Mon Mar 8 10:53:54 2010