zimmers.net Commodore archive. The various combinations of keyboard and screen are there, these are the ones available for BASIC 4 machines with a CRTC (the later 4032 and 8032 machines).
- 901498-01 - edit-4-40-n-50Hz (40 column, normal keyboard UK)
- 901499-01 - edit-4-40-n-60Hz (40 column, normal keyboard US)
- 901474-04 - edit-4-80-b-50Hz (80 column, business keyboard UK)
- 901474-03 - edit-4-80-b-60Hz (80 column, business keyboard US)
These are the 4 versions Commodore originally produced, the 9014xx numbers are the Commodore part numbers, so the standard UK 8032 has the 901474-04 chip in the UD7 socket.
project to generate new editor ROMs, that adds all sort of nice features, but unfortunately, the 40 column version is currently incomplete. As part of this project, he has disassembled and annotated a number of editor ROMs, including some ones with N and B keyboards. He kindly made those available and I was able to compare the relevant sections. The main change is a 64 byte block at the end which is the 8x8 key matrix lookup table.