Re: 264/TED/Plus4 Story

From: Gerrit Heitsch <>
Date: Thu, 27 Oct 2011 19:46:17 +0200
Message-ID: <>
On 10/27/2011 07:29 PM, crock wrote:
> Hi Gerrit,
> The TED on the C16 board is 7360R7 week 10, 1984, ceramic. The one
> inside the +4 is the same but I can't remember the week without popping
> the case again.

Thank you. Another little addition to my list of MOS chips where I try 
to collect not only the numbers but also all known revisions. R7 
suggests that it took MOS a while to get that chip stable.

> The one in the 232 is also ceramic but the heatsink is
> epoxied to the top of the chip and I'm not prepared to chisel it off!!!

I have a TED like that too. I doubt you can remove the heatsink without 
damaging the chip.

> All the cpu's are 7501's and plastic. The earliest one is week 51, 1983.

Are they all R1 or are there other revisions? I only have a single 7501 
which is an R1 from 2684. All the other CPUs are 8501R1.

> Two of the PLA's were ceramic, but sadly only one of them is still
> functional, from week 8, 84.

The ceramic PLA I have is 1084. You do know that there is someone 
selling a PLA replacement that can be used for the C64 and the 264 
systems (selected by jumper setting)?

> Thanks for explaining the lack of reset on the TED, I'm still surprised
> that the cost of laying out and producing a new CPU was worth it though....

 From what I read, MOS had the 6502 as a core, so the 7501 shouldn't 
have been too hard to create. Especially since most of the extra logic 
was already done due to the I/O port in the 6510.

I also assume they expected better sales than they got. :)

What does surprise me is that the 8501 was still made in 1990, looks 
like MOS kept making spares even though the 264 line was dead.


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Received on 2011-10-27 18:00:16

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