Commodore B128

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Released

1982

Discontinued

1984

Operating System

Commodore BASIC 4.0

Acquired

October, 2019

Serial

002720

This Machine

• MOS 6509 CPU at 2 MHz

• 128K Dynamic RAM

• MOS 6581 SID Audio, 3 voice synthesizer

• 68B45 CRTC Video, text only, 80x25 with PETSCII graphic characters

• Full-sized 102 key QWERTY keyboard with numeric keypad and 4 direction cursor

• PET2SD IEEE-488 to SD Card adapter

• Ports:

  • IEEE-488 Parallel

  • 25 Pin RS-232 serial

  • Datasette

  • 5 Pin Video/Monitor

  • CBM-II Expansion/Cartridge connector

  • RCA audio out

Resources

• Commodore B128 Service Manual IC Crossreference

• Commodore B128 Service Manual Jumpers, Ports, and Lines

• My odds and ends on GitHub

• Commodore CBM-II at wikipedia.org

• B128 Schematics, manuals, and firmware at zimmers.net

• Steve J. Gray's The Commodore CBM-II Page at 6502.org

• Edward D. Shockley's Commodore B Series at insectria.org

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