From: Gerrit Heitsch <>
Date: Sun, 24 Jul 2016 12:58:36 +0200
Message-ID: <>
On 07/24/2016 11:41 AM, Segher Boessenkool wrote:
> On Sun, Jul 24, 2016 at 06:43:15AM +0200, Gerrit Heitsch wrote:
>> On 07/23/2016 11:56 PM, Segher Boessenkool wrote:
>>> On Sat, Jul 23, 2016 at 09:21:26PM +0200, Gerrit Heitsch wrote:
>>>> Forgot that in the last post... There is also the 6510T as used in the
>>>> 1551 floppy drive. It has the full 8 Bit port. To me the pinout suggests
>>>> that it's just a different bond out of the 6510:
>>> Or (more likely imnsho) 8500.
>> 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?


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Received on 2016-07-24 11:01:35

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