The Commodore CBM-II is the follow-up system to the Commodore PET.
Launched in 1982 after the PET was discontinued, the CBM-II shipped in two different versions. Both the P & B series (Personal & Business) were produced for the two different markets. There are 6 models in total made of the CBM-II. Each had its own RAM configurations or an additional co-processor card in the high-end 630 & 730 models.
Both versions utilised the MOS 6509 processor, the personal version clocked @ 1mhz and the business @ 2mhz. Two main RAM configuration options for both series came in either 128k or 256k versions. 64K and 192k versions of the CBM-II originally planned were dropped early in development.
The P series was canceled in the US before it became available, primarily due to the popularity of the Commodore 64 which launched also in 1982.
The CBM-II was a short-lived product, due to high manufacturing costs and being tricky to develop. The fact the C64 was released meant the P series would unlikely be adopted in high numbers.
A lifelong avid gamer and computing enthusiast, Matt has decades of experience in the field, so producing retro orientated content for How To Retro comes is second nature to him. Now over 40 years old, Matt now even considers himself retro, but fortunately, nobody has developed a Matt emulator (not yet at least!).