ⓘ 12-bit. In computer architecture, 12-bit integers, memory addresses, or other data units are those that are 12 bits wide. Also, 12-bit CPU and ALU architectures ..

                                     

ⓘ 12-bit

In computer architecture, 12-bit integers, memory addresses, or other data units are those that are 12 bits wide. Also, 12-bit CPU and ALU architectures are those that are based on registers, address buses, or data buses of that size.

Possibly the best-known 12-bit CPU is the PDP-8 and its relatives, such as the Intersil 6100 microprocessor produced in various incarnations from August 1963 to mid-1990. Many analog to digital converters ADCs have a 12-bit resolution. Some PIC microcontrollers use a 12-bit word size.

12 binary digits, or 3 nibbles a tribble, have 4096 10000 octal, 1000 hexadecimal distinct combinations. Hence, a microprocessor with 12-bit memory addresses can directly access 4096 words 4 Kw of word-addressable memory. At a time when six-bit character codes were common a 12-bit word, which could hold two characters, was a convenient size. IBM System/360 instruction formats use a 12-bit displacement field which, added to the contents of a base register, can address 4096 bytes of memory.

                                     

1. List of 12-bit computer systems

  • PDP-5
  • DECmate, a personal computer based on the Intersil 6100
  • PDP-8
  • Digital Equipment Corporation
  • PDP-14
  • PDP-12
  • Toshiba TLCS-12 microprocessor
  • Ford EEC I automotive engine control unit
  • Intersil IM6100 microprocessor PDP-8-compatible
  • CDC 160 series computers
  • CDC 6600 - Peripheral Processor PP
  • Control Data Corporation
  • LINC, later commercialized by DEC as the LINC-8
  • Ferranti Argus
  • PC12 minicomputer
  • National Cash Register NCR 315
  • Electronic Arrays 9002 12-bit addressing but 8-bit byte
  • Scientific Data Systems SDS 92
                                     
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