This is to replace the two 6550 video RAM chips in early Commodore PET 2001 boards
Designed by Tynemouth Software in United Kingdom
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Last shipping date for international orders 7th December, UK orders 14th December. EU shipping not available due to new GPSR regulations.
What is it? This is a board which replaces the two 6550 video RAM chips in some PET 2001 boards. Why did you make it? The 6550 RAM chips are a common point of failure in early PETs, so this will rep…
Read More…This is a board which replaces the two 6550 video RAM chips in some PET 2001 boards.
The 6550 RAM chips are a common point of failure in early PETs, so this will replace them with a modern static RAM chip.
You can spot these as a pair of MPS 6550 chips in the unusual size of 22 pin 400mil spacing, near the back of the PET board. This cannot be used to replace 6550 RAM in as system RAM or anywhere else, just the video RAM. If you need to replace the main system RAM, use a PET ROM/RAM board - see elsewhere in my store for that.
Some late model 2001 PETs have 2114 video, this will not replace that, but I have a board for that as well.
This listing include the 6550 replacement board only (the red V4.0 boards). It does not include the PET 2001 board, 6550 RAM chips or any of the other things shown such as the Charter ROM replacement, PET ROM/RAM, PET Video, PET Dual Joystick with Piezo and SD2PET (all of which are available separately)
This will also allow PET Diagnostics to run on a 2001, as that is not compatible with the 6550 video RAM timings.
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