Scanner Board/Terminal Multiplexer Board

Clearly this is a very important component of the system, unique to Entrex!  According to Barry King, who was an Area Field Engineering Manager for Entrex from 1977-1991 in Nashville, TN:

"The key to the Entrex system was the Scanner board and software developed by 2 or 3 guys at MIT as a project to complete their Master's.".  Read more here.

Scanner Board/Terminal Multiplexer Board Schematics

Click HERE for more & closer pictures of this board

Component	Qty
899-5-R220/330	1
SN7400	20
SN7404	18
SN7408	3
SN7410	9
SN74107	1
SN74121	2
SN74122	1
SN74177	1
SN74179	5
SN7438	16
SN7440	7
SN7442	1
SN7474	13
SN7476	3
SN7493	4
SN75451	7

Full Component List

 Barry King  July 24, 2019

Hi AJ. Sorry for the extremely late response. I have been very busy the last months. The key to the Entrex system was the Scanner board and software developed by 2 or 3 guys at MIT as a project to complete their Master's. Without those two it was just a regular Data General mini-computer. The scanner polled each terminal for service and did it extremely fast.. Each terminal was directly connected individually. From the Entrex/Nixdorf days, all I have are a handful of terminal connectors and a Field Service book. If I can provide any helpful info just let me know. I will watch more closely. Regards, Barry