Commodore B500-256

The B256 is the 256K version of the B128/B500. Whereas the B128 only utilizes the 64K in bank 1 for BASIC code, and bank 2 for variables, the B256 adds banks 3 and 4 for variable storage as well. Seen here is a factory produced B256 (256k) motherboard in a case whose sticker proclaims it as a B500 model machine. Whether any machines were actually released with a "B256" model number, or if all B256's are actually B500 model machines with 256k is unknown. This issue is further confused by the fact that the box this unit came in proclaims it to be a B256 proper, with no mention of "B500".