System Module: Difference between revisions

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[[File:Dec SYSTEM BUILDING BLOCKS 1103.jpg|thumb|System Module 1103 hex-inverter card (both sides)]]
 
'''System Modules''' (also sometimes known as '''System Building Blocks''') wereare a [[Digital Equipment Corporation|DEC]] modular digital logic family which preceded the later [[Flip Chip (PDP module)|FLIP CHIP]]s. They connectedconnect to the units they wereare plugged into via a set of 22 gold-plated discrete pins along one edge.<ref name=SysModvii>"System Modules", pg. vii</ref>
 
They useduse [[transistor]] inverter circuits, with the transistors operating saturated, to avoid dependence on tight tolerances; they useduse -3V and 0V as logic levels. Intended for prototyping as well as production, they includedinclude design features intended to avoid damage. They cameare provided with design advice which includedincludes loading rules, and wiring instructions.<ref name=SysMod4>"System Modules", pg. 4.1-4.9</ref>
 
They were available in three compatible speed lines:
 
* 4000-Series: the basic series, speeds rangedrange from 500 KHz to 1 MHz<ref name=SysMod6>"System Modules", pg. 6.1-6.40</ref>
* 1000-Series: usedfor use where extra standard output loads, or -3V sources, wereare needed<ref name=SysMod7>"System Modules", pg. 7.1-7.16</ref>
* 6000-Series: higher speeds, 5 MHz to 10 Mhz<ref name=SysMod8>"System Modules", pg. 8.1-8.13</ref>
 
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<ref name=SysMod9>"System Modules", pg. 9.1-9.60</ref>
 
Larger assemblies which wereare part of the same family providedprovide core memory testing devices, and there wereare also power supplies, mounting panels with slots for the modules, cabinets to hold groups of mounting panels,indicator light panels, etc, etc.<ref name=SysMod10>"System Modules", pg. 10.1-10.35</ref>
 
==Notes==