Re: 264 Series and their chips

From: Gerrit Heitsch <>
Date: Sat, 13 Aug 2011 17:58:07 +0200
Message-ID: <>
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.


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Received on 2011-08-13 16:00:17

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