Latest revision as of 23:33, 18 May 2016

GIM SBA
Developer	General Instrument
Manufacturer	General Instrument
Type	microcontrollers
Production	November, 1977
Architecture	1-bit
ISA	SBA
Word size	1 bit 0.125 octets 0.25 nibbles
Technology	nMOS
Clock	10 kHz-800 kHz
Package	DIP40

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.

Members[edit]

Architecture[edit]

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.

This section requires expansion; you can help adding the missing info.

ISA[edit]

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.

This article is still a stub and needs your attention. You can help improve this article by editing this page and adding the missing information.