From: Segher Boessenkool <>
Date: Sun, 24 Jul 2016 06:42:20 -0500
Message-ID: <>
On Sun, Jul 24, 2016 at 12:58:36PM +0200, Gerrit Heitsch wrote:
> >>Depends... On the later Chips, MOS included a number to the right of the
> >>datecode. From what we've been able to determine, if it starts with a
> >>'1', the Chip is NMOS and if it starts with a '2', the chip is HMOS-II.
> >>The other numbers are the revision and match the R-number if it's
> >>present on the chip. I have a few 6510 from after 1986 that have a '16'
> >>printed there, so they would be NMOS which would suggest the 6510T also
> >>to be NMOS since it's from 1984.
> >
> >Great info, thanks!
> I looked through my collection and found a GARY (5719) where this number 
> is a '42' and a BUSRTER (5721) with a '40', suggesting the '4' stands 
> for CMOS. I also have a  C64-ROM with a '31', but no idea what the '3' 
> could mean. The '4510R3' from the C65 has a '53'... So what could the 
> '5' mean?

Some more info, from c64 chips...

Some 6502AD are marked "1D".

Some roms are marked "01".

All 1986 chips I found have no such marking, all 1987 chips do.  So
somewhere around this was introduced.


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Received on 2016-07-24 12:00:02

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