Hi i got a 128 swedish commodore 128 have a missing charrom socket, i need to know how to install a eprom in place of the charrom. I have an eprom programer and new 27c256 eproms ready for the task but i can't find a guide to do the install.
Well, U18 is an 8K ROM. It holds two character sets.
On US(UK?) machines, it holds two similar but different "fat" character sets (one for C64-mode, and another for C128 [similar to Plus/4]).
On international machines, it holds two quite different character sets. First is a C64 compatible "fat" [default for C128], and second is a "thin/country" font [must press ASCII/DEN key].
The 8K ROM must contain 2 separate fonts. The first is for C64 (or C128 "classic"), while the second is for C128 (standard or "thin")
I am so, so, so SORRY if that is confusing... I am perfectly able to clarify that junk, but you would have to tell me if you are using US machine or some other 128 (please specify NTSC/PAL or country).
Err, in conclusion, you need an 8K (compatible) chip to stuff into the U18 socket...