10 Oct
2019
10 Oct
'19
10:38 a.m.
http://www.swtpc.com/mholley/Notebook/Notebook_Index.htm
Maybe useful?
-----Original Message-----
From: cctalk [mailto:cctalk-bounces at classiccmp.org] On Behalf Of Wouter de
Waal via cctalk
Sent: Thursday, October 10, 2019 7:33 AM
To: 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
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