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Posted to sci.electronics.components,sci.electronics.design,sci.electronics.repair,alt.engineering.electrical
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40-pin controller IC identity?
Franc Zabkar ) writes:
On 17 Mar 2007 08:56:38 -0700, put finger to
keyboard and composed:
On Mar 17, 11:17 am, Lionel wrote:
National MM9224.
Almost certainly not. 9224 is the date code.
AFAICT, the date code of Q15 is 9920 and for the relays it is 9807.
Would it make sense for a manufacturer to use old mask ROMmed stock in
a new design?
Something that's mask programmed, you don't want to buy in small quantities.
Hence so long as the design is still viable, you don't want to change
things until you absolutely have to (such as running out of that mask
programmed device, or something else is just no longer available).
Michael
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