Mystery chip SCM44506L

[dwight]

Maybe they are OTP?
Dwight

________________________________
From: cctech <cctech-bounces at classiccmp.org> on behalf of Wouter de Waal via cctech <cctech at classiccmp.org>
Sent: Thursday, October 10, 2019 5:33 AM
To: cctech at classiccmp.org <cctech at classiccmp.org>
Subject: Re: Mystery chip SCM44506L


>
>Very likely a semi custom or custom memory device, due to the prefix.

Armed with that and the fact that pin 1 connects to the leadframe I
figured maybe it's something like the 6830 Mikbug prom -- 0V on 1, 5V
on 12, data on the left, address on the right. Tried reading it like
that (for all 16 combinations of chip selects) but 0xFF throughout.

So I popped the lid, stuck it under a microscope. The chip says
"MCM6816" which is in fact a 1k ROM.

Anyone have more information on the 6816 ROM?

Thanks

W