|Word size|| 1 bit|
|Clock||10 kHz-800 kHz|
The GI SBA (Sequential Boolean Analyzer) was a family of 1-bit microcontrollers developed by General Instrument's Microelectronics division. These microcontrollers served as cheap programmable logic controllers, replacing old relay system.
|SBA||120x1 bits||1024x8 bits||31|
|SBA-1||120x1 bits||31||external storage|
|SBA-2||120x1 bits||2048x8 bits||31||?ever released?|
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.
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- Main article: SBA ISA
The SBA family had 8-bit instructions consisting of instructions with immediate and without immediate values. In total there were 24 instructions used for arithmetic, I/O, and page switching.
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|designer||General Instrument +|
|full page name||general instrument/sba +|
|instance of||microcontroller family +|
|instruction set architecture||SBA +|
|main designer||General Instrument +|
|manufacturer||General Instrument +|
|name||GIM SBA +|
|word size||1 bit (0.125 octets, 0.25 nibbles) +|