Re: VIC-42

From: Anders Carlsson <>
Date: Thu, 24 Jun 2021 08:38:36 +0200
Message-ID: <> wrote:

> The socket sits tightly on top of the package. I can't see the connections but nothing goes to the sides/pins so there aren't many options left.

So this variant takes a 2316 ROM or similar EPROM in order to change the 
ROM part while retaining all the other properties of the chip? Did MOS 
also supply this type or was it something Rockwell apparently produced? 
While it increases the chip count by 1, the PCB footprint remains the 
same and easier to upgrade firmware if required.

Or like Helmut Proxa mentioned on FB, that Commodore Germany once got a 
big batch of 6500/1 chips preprogrammed for IEEE drives, but the chips 
they required were the one for the 1520 plotter so it was dead weight to 
them and Helmut got access to the spares. The cost savings in combining 
microcontroller, ROM and a bit of workspace RAM into one chip suddenly 
went down the drain when the wrong chip was put together and shipped. 
Hopefully it only happened internally within Commodore, it would cause 
them egg on face if they had an external customer ordering 6500/1 and 
receiving the wrong type because they all look so similar.

Best regards

Anders Carlsson
Received on 2021-06-24 09:00:03

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