TC531000 EPROM Equivalent?

There isnt one, however the closest EPROM is the 27c010 so you would need to make a simple adaptor to use one. Yes it is more legs but take a look at what the extra ones are, you only need to move 2 pins.
 
Actually there is one...

The non-JEDEC pin 1Mb EPROM (HN27C301, for example) is pin for pin compatible with the mask ROM for 27 of the 28 pins of that mask ROM.

The power connection is different and there's an extra enable line that must be grounded on the EPROM.

Pull up the data sheets on http://www.datasheetarchive.com and take a look.

RJ
 
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