terminal programs for your 30 year old commodore is nothing really new, but this one is a bit special:
it is designed as a cartridge, so you do not have to load any programm, but rather just turn on your c64.
the serial connection is being etablished with the build in 232 routines; very simple, but slow.
just a little glue to get the same voltage levels on both sides, C64 and Linux PC...

On the PC side you need to teach your Linux to talk not too much (40 colums 25 rows on the c64)

the authors manual is great: http://formica.nusseis.de/Cater/
seht und staunt: