Old MOS Mask-Programmed ROM forgetfulness?

[Eric Smith]

On Tue, Feb 16, 2016 at 12:06 PM, Brent Hilpert <hilpert at cs.ubc.ca> wrote:
> Apparently there actually is an equivalent EPROM, according to this
> datasheet for the MM4203/MM5203 EPROM:
>         http://www.datasheetarchive.com/dl/Scans-006/Scans-00137265.pdf
>
> It states they are pin-compatible to the MM5213/MM5231 mask ROMs.

Interesting. I checked the MM5204, but not the MM5203.  The MM5203
requires wiring for pins 22 and 23 that the MM5231 doesn't, but other
than that it does appear the same.