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The CBM 256-80 represents the top of the CBM-II line of computers. It sports a stylish high-profile case with built in monitor, similar to that of the 8032sk, all of the capabilities of the more common B128, plus the additional ram (available through memory banking) needed for business computing. In addition, this particular unit contains the 8088 daughterboard, meant for running MS-DOS applications, which were just becoming popular in business computing at that time.

Statistics, features, and CBM 'B' machine resources:

CPU: MOS 6509

• 1 mhz
• Optional 8088 daughterboard included

RAM: 256 Kilobytes

• Expandable to 704k external

ROM: 24 Kilobytes

• CBM-II Kernal
  • (Download image)
• CBM Basic 4.0
  • 256k (B256) Basic ROM Low
    (Download image)
  • 256k (B256) Basic ROM High
    (Download image)
• Character ROM(Download image)

Video: MOS 6545 CTRC

• Monitor: 12" Monochrome display
• Text: 80 columns, 25 rows.

Sound: MOS 6581 SID

• 3 voice stereo synthesizer/digital sound capabilities

Ports: CSG 6551/6525x2/6526

• Male edge-connector IEEE-488 port
• Male edge-connector CBM Datasette port
• Female RS232 port
• Female edge-connector CBM-II/PET-II expansion port
• 1 RCA audio port
• Power and reset switches

Keyboard: Full-sized 102 key QWERTY

• 19 key numeric keypad!
• 4 direction cursor-pad

Personal Note:I was astonished to finally get my hands on this beauty from an eBay auction. The seller told me that it was non-functional. He was wrong. Moreoever, this particular unit contains the EXTREMELY rare 8088 daughterboard (pictured above). My next mission is coming up with a keyboard, so that I may investigate this machine further.

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