Difference between revisions of "Lear Siegler ADM-3A"
m (+cat) |
m (sub-cat) |
||
| Line 13: | Line 13: | ||
* [http://bitsavers.trailing-edge.com/pdf/zentec/Zentec_ADM3_Retrofit/ Bitsavers Zentec repository] | * [http://bitsavers.trailing-edge.com/pdf/zentec/Zentec_ADM3_Retrofit/ Bitsavers Zentec repository] | ||
| − | [[Category:Terminals]] | + | [[Category: Video Terminals]] |
Latest revision as of 01:25, 8 June 2018
The Lear Siegler ADM-3A was a very popular early video terminal; its low price (US$955), compared to its competitors, made it a common choice. The "ADM" part of the name reputedly stood for 'American Dream Machine'.
It was implemented entirely in discrete gates (TTL family); this was long before the era of microprocessors, or any other programmable technology.
The -3A was based on an earlier model, the -3, which initially only supported upper-case, and displayed 12x80 characters; options for lower-case, and 24x80 display, were later made available. The -3A differed in supporting the ability to set the cursor to any screen location, making use with video editors possible.
Later retrofit
Zentec produced a retrofit card which replaced the very large original PCB of the ADM-3A with a much smaller card using the NS405 Terminal Management Processor chip.
