System Module: Difference between revisions

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{{Short description|Modules used in early PDP computers}}

[[File:PDP-1 System Building Block No. 4106.jpg|right|thumb|PDP-1 system module (with a replaced transistor)]]

[[File:Dec SYSTEM BUILDING BLOCKS 1103.jpg|thumb|System Module 1103 hex-inverter card (both sides)]]

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They were available in several compatible speed lines:

* 4000-Series: the second series, nominally 500 &nbsp;KHz, but some 1 &nbsp;MHz<ref name=SysMod6>"System Modules", pg. 6.1-6.40</ref>

* 1000-Series: the original series, nominally 5 &nbsp;MHz<ref name=SysMod7>"System Modules", pg. 7.1-7.16</ref>

* 6000-Series: higher speeds, nominally 10 Mhz&nbsp;MHz<ref name=SysMod8>"System Modules", pg. 8.1-8.13</ref>

* 8000-Series: very high speeds, nominally 30MHz30&nbsp;MHz<ref>"[http://bitsavers.org/pdf/dec/modules/8000_series/8000_Series_Sep64.pdf 30 Megacycle Modules"]</ref>

In addition, special modules were available for purposes such as [[Input/Output]] (I/O) converters (to standard internal voltages), bus drivers, lamp and solenoid drivers, [[A/D conversion]], relays, [[magnetic-core memory|core memory]] drivers, etc.<ref name=SysMod9>"System Modules", pg. 9.1-9.60</ref>

Larger assemblies which are part of the same family provide core memory testing devices. There are also power supplies, mounting panels with slots for the modules, cabinets to hold groups of mounting panels, indicator light panels, etc.<ref name=SysMod10>"System Modules", pg. 10.1-10.35</ref>