RE: 264 Series and their chips

You are correct about the processes and numbering.

Bil Herd

-----Original Message-----
From: owner-cbm-hackers@musoftware.de
[mailto:owner-cbm-hackers@musoftware.de] On Behalf Of Gerrit Heitsch
Sent: Saturday, August 13, 2011 11:58 AM
To: cbm-hackers@musoftware.de
Subject: Re: 264 Series and their chips

On 08/12/2011 08:16 AM, Nate Lawson wrote:
>
> HMOS is still an NMOS process, just with higher density. Most of the
early Amiga chips were HMOS too. I think it wasn't until Commodore started
outsourcing some of the chip production that they moved to CMOS.

If I understand the MOS numbering scheme correctly, all 8xxx-Chips are
HMOS-II. I wasn't able to confirm it anywhere, but from the absence of the
ICs getting warm, the 5xxx-Chips (I know of 3 with a 5xxx number) should
be CMOS. Later MOS/CSG unfortunatly abandoned the easy to remember four
digit numbers and just printed the Commodore part numbers and/or names on
them.

  Gerrit


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