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{{gi title|SBA}}
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The '''GI SBA''' ('''General Instrument Microelectronics Sequential Boolean Analyzer''') is a [[1-bit architecture]] microprocessor developed by [[General Instrument|General Instrument's]] [[General Instrument Microelectronics|Microelectronics]] division. The chip featured 24 basic instructions, 1023 words of ROM, 16-level stack, and storage. The [[GI SBA-1]] is an identical chip without the ROM; ROM data lines were brought out instead to allow external storage.
{{ic family
 
| title            = GIM SBA
 
| image            = <!-- Image representation of the IC family, e.g. "MCS-4.jpg"  -->
 
| caption          = <!-- description of the image                                  -->
 
| developer        = General Instrument
 
| manufacturer      = General Instrument
 
| type              = microcontrollers
 
| production start  = November, 1977
 
| production end    =
 
| arch              = 1-bit
 
| isa              = SBA
 
| word              = 1 bit
 
| proc              = <!-- process, e.g. "8 μm"                                      -->
 
| tech              = nMOS
 
| clock min        = 10 kHz
 
| clock max        = 800 kHz
 
| package          = DIP40
 
}}
 
The '''GI SBA''' ('''Sequential Boolean Analyzer''') was a [[microprocessor family|family]] of {{arch|1}} [[microcontroller]]s developed by [[General Instrument|General Instrument's Microelectronics]] division. These microcontrollers served as cheap [[programmable logic controller]]s, replacing old relay system.
 
 
 
== Members ==
 
{| class="wikitable sortable"
 
|-
 
! Part !! [[RAM]] !! [[ROM]] !! I/O Ports !! Notes
 
|-
 
| {{\|SBA}} || 120x1 bits || 1024x8 bits || 31 ||
 
|-
 
| {{\|SBA-1}} || 120x1 bits ||  || 31 || external storage
 
|-
 
| {{\|SBA-2}} || 120x1 bits || 2048x8 bits || 31 || ?ever released?
 
|}
 
 
 
== Architecture ==
 
The SBA family had a large number (over 30) of I/O ports that could all be individually accessed programatically. Additionally, it had a relatively complex scheme of data storage. In total there were 120 words (1-bit each). This was broken down into 4 pages of 30 addresses each. The program had to choose which page it was working with currently and once that was done, any address selection was done on that page.
 
 
 
{{expand section}}
 
=== ISA ===
 
{{main|general_instrument/sba/isa|l1=SBA ISA}}
 
The SBA family had 8-bit instructions consisting of instructions with immediate and without [[immediate value]]s. In total there were 24 instructions used for arithmetic, I/O, and page switching.
 
  
  
 
{{stub}}
 
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[[Category:1-bit microprocessors]]

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designerGeneral Instrument +
full page namegeneral instrument/sba +
instance ofmicrocontroller family +
instruction set architectureSBA +
main designerGeneral Instrument +
manufacturerGeneral Instrument +
nameGIM SBA +
packageDIP40 +
technologynMOS +
word size1 bit (0.125 octets, 0.25 nibbles) +