Old MOS Mask-Programmed ROM forgetfulness?

Eric Smith spacewar at gmail.com
Tue Feb 16 16:22:07 CST 2016

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.

More information about the cctalk mailing list