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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''') were a [[Digital Equipment Corporation|DEC]] modular digital logic family which preceded the later [[FLIP CHIP]]s. They connected to the units they were plugged into via a set of 22 gold-plated discrete pins along one edge.<ref name=SysModvii>"System Modules", pg. vii</ref>▼
▲'''System Modules''' (also sometimes known as '''System Building Blocks''') were a [[Digital Equipment Corporation|DEC]] modular digital logic family which preceded the later [[Flip Chip (PDP module)|FLIP CHIP]]s. They connected to the units they were plugged into via a set of 22 gold-plated discrete pins along one edge.<ref name=SysModvii>"System Modules", pg. vii</ref>
They used [[transistor]] inverter circuits, with the transistors operating saturated, to avoid dependence on tight tolerances; they ran off -3V. Intended for prototyping as well as production, they included design features intended to avoid damage. They came with design advice which included loading rules, and wiring instructions.<ref name=SysMod4>"System Modules", pg. 4.1-4.9</ref>▼
▲They used [[transistor]] inverter circuits, with the transistors operating saturated, to avoid dependence on tight tolerances; they
They were available in three compatible speed lines:
Line 7 ⟶ 9:
* 4000-Series: the basic series, speeds ranged from 500 KHz to 1 MHz<ref name=SysMod6>"System Modules", pg. 6.1-6.40</ref>
* 1000-Series: used where extra standard output loads, or -3V sources, were 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>
In addition, special modules were available for purposes such as I/O converters (to standard internal voltages), bus drivers, lamp and solenoid drivers, A/D conversion, relays, [[magnetic-core memory|core memory]] drivers, etc.
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