http://cgi.ebay.com/Commodore-PET-ROM-C ... 7C294%3A50
This auction is for one adapter capable of replacing a single MOS Technologies MPS6540 ROM chip. Included in the price is the needed 2716 ROM chip, programmed with the code you need. Please specify the full part number of the original chip when ordering so that I can program the replacement correctly. Also included is free shipping to the US and Canada as well as a lifetime guarantee on the adapter. If the adapter does not work in your computer I will work with you until the problem is solved. If the adapter ever fails, just mail it back to me for a free repair.
These adapters replace MOS Technologies proprietary ROM chips with standard 2716 ROM chips and have the following features. They are:
1) Exact electrical replacements for the mps6540 (except that they do not require a clock signal.) All five chip select lines are fully functional.
2) Have a small enough footprint that the adapters can replace any or all of the ROM chips in a PET 2001.
3) Use only parts that were available in 1977 and so they will not look out of place in a PET.
The one disadvantage of these adapters is that with a 2716 inserted they are about 0.4" taller than the original 6540 chip and thus may not be mechanically compatible with all 3rd party expansion boards. Please make the appropriate measurements before ordering.
I have all of the technical details available on my website http://www.6540rom.com Please have a look.
Please note that these adapters are made-to-order, and I am a full-time student, so there may be up to 1 week delay after you win the auction and before I can ship your purchase.
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