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MOS Technology 6523

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The 6523 Tri-Port Interface (TPI) was an integrated circuit from Commodore Semiconductor Group and their MOS Technology factory. It was somewhat related to the 6522 Versatile Interface Adapter, but with three ports instead of two. The 6523 did not include a timer, shift register or interrupt output. Instead it offered three 8-bit I/O ports. The lack of interrupt control made it more dependent on other chips (which are required to constantly check the registers of the 6523) and thus the 6523 did not see wide adoption. Later, an interrupt control circuit and pin was added and the circuit renamed as "6525 Tri-Port Interface".


  • MCS6523 running at 1MHz in a 40-pin DIP package
  • MCS6523A running at 2MHz in a 40-pin DIP package
  • MCS6523B running at 3MHz in a 40-pin DIP package
  • MCS6523A-28 running at 2MHz in a 28-pin DIP package
  • Rockwell 338-6523 in a 40-pin DIP package

List of equipment that used the 6523:

  • The Commodore P500 computer
  • Commodore B128/CMB 600-series of computers
  • Commodore B256/CBM 700-series of computers
  • The Commodore 1551 disk drive
  • The Apple LaserWriter II NT controller board (Rockwell 6523 - erroneously stated as "6532" in the service manual )

The form factor was a JEDEC-standard ceramic or plastic DIP with either 40 or 28 pins.

External links[edit]

Category:MOS Technology integrated circuits

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