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A '''bit-slice microprocessor''' ('''BSM''') is a [[microprocessor]] designed as a module with the primary purpose of being able to assemble multiple identical such microprocessors to form a larger processor of some desired [[word size]]. Bit-slice microprocessors can be cascaded to produce any conventional (e.g. [[4-bit architecture|4-bit]], [[8-bit architecture|8-bit]], [[16-bit architecture|16-bit]]) as well as unconventional word sizes (e.g. [[10-bit architecture|10-bit]], [[12-bit architecture|12-bit]], [[16-bit architecture|16-bit]]). A notable advantage of a BSM over discrete logic components is the fact that most connections are internal to the chip with only few connections being external.  
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{{title|Bit-Slice Microprocessor (BSM)}}
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A '''bit-slice microprocessor''' ('''BSM''') is a [[microprocessor]] designed as a module with the primary purpose of being able to assemble multiple identical such microprocessors to form a larger processor of some desired [[word size]]. Bit-slice microprocessors can be cascaded to produce any conventional (e.g. [[4-bit architecture|4-bit]], [[8-bit architecture|8-bit]], [[16-bit architecture|16-bit]]) as well as unconventional word sizes (e.g. [[10-bit architecture|10-bit]], [[12-bit architecture|12-bit]], [[18-bit architecture|18-bit]]). A notable advantage of a BSM over discrete logic components is the fact that most connections are internal to the chip with only few connections being external.  
  
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== bit-slice microprocessors==
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A departure from normal [[microprocessor]]s is that fact that many bit-slice chips do not have an [[instruction set architecture]]. Such bit slicing systems allow designers to create their own architecture and other key characteristics such as I/O pins and address width. This flexibility of course came with overall more expensive system and larger amount of ICs.
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{| class="wikitable"
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! [[Word size]] !! colspan="7" | Microprocessors
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== Bit-slice microprocessors==
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{| class="wikitable" style="text-align: center;"
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! Word size !! colspan="9" | Microprocessors
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|-
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! || [[Intel]] || [[National Semiconductor|National]] || [[AMD]] || [[Monolithic Memories|MMI]] || [[TI]] || [[Fairchild]] || [[Motorola]] || [[RCA]] || [[7400 series|7400]]
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|-
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<!-- ======== 2-bit ======== -->
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| {{arch|2}}
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|| {{intel|3000}} ([[1974]])
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||
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||
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||
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||
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||
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||
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||
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||
 
|-
 
|-
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| [[2-bit architecture|2-bit]] || [[Intel 3002]] || || || || ||
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<!-- ======== 4-bit ======== -->
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| {{arch|4}}
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||
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|| {{national|IMP-4}}
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|| {{amd|Am2900}}
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|| {{mmi|5700}} ([[1974]])
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|| {{ti|SBP0400}}<br>{{ti|SN54S481|SN54S481}}<br>{{ti|SN74S481|SN74S481}}
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|| {{fairchild|9400}}<br>{{fairchild|4700}}
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|| {{motorola|10800}}
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||
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|| {{74s|74S181}}<br>{{74s|74S381}}
 
|-
 
|-
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| [[4-bit architecture|4-bit]] || || [[National IMP-4]] || [[AMD 2900]] || [[MMI 5701]]<br />[[MMI 6701]] || [[TI SBP0400]] || [[74181]]
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<!-- ======== 8-bit ======== -->
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| {{arch|8}}
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||
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|| {{national|IMP-8}}
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||
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||
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|| {{ti|SN54AS888}}<br>{{ti|SN74AS888}}
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|| {{fairchild|100K}}
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||
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|| {{rca|EPIC}}
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||
 
|-
 
|-
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| [[8-bit architecture|8-bit]] || || [[National IMP-8]] || || || [[TI SN54AS888]]<br />[[TI SN74AS888]] ||
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<!-- ======== 16-bit ======== -->
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| {{arch|16}}
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||
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|| {{national|IMP-16}}
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|| {{amd|Am29100}}
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|-
 
|-
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| [[16-bit architecture|16-bit]] || || [[National IMP-16]] || [[AMD 29100]] || || ||
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<!-- ======== 32-bit ======== -->
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| {{arch|32}}
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|| {{amd|Am29300}}
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|| {{ti|SN74ACT8832}}
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{{stub}}
 
{{stub}}
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[[Category:all microprocessor families]]

Latest revision as of 18:09, 20 October 2025

A bit-slice microprocessor (BSM) is a microprocessor designed as a module with the primary purpose of being able to assemble multiple identical such microprocessors to form a larger processor of some desired word size. Bit-slice microprocessors can be cascaded to produce any conventional (e.g. 4-bit, 8-bit, 16-bit) as well as unconventional word sizes (e.g. 10-bit, 12-bit, 18-bit). A notable advantage of a BSM over discrete logic components is the fact that most connections are internal to the chip with only few connections being external.

A departure from normal microprocessors is that fact that many bit-slice chips do not have an instruction set architecture. Such bit slicing systems allow designers to create their own architecture and other key characteristics such as I/O pins and address width. This flexibility of course came with overall more expensive system and larger amount of ICs.

Bit-slice microprocessors[edit]

Word size Microprocessors
Intel National AMD MMI TI Fairchild Motorola RCA 7400
2-bit 3000 (1974)
4-bit IMP-4 Am2900 5700 (1974) SBP0400
SN54S481
SN74S481 		9400
4700 		10800 74S181
74S381
8-bit IMP-8 SN54AS888
SN74AS888 		100K EPIC
16-bit IMP-16 Am29100
32-bit Am29300 SN74ACT8832


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