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System Modules (originally known as System Building Blocks; the name was changed around 1961) are a DEC modular digital logic family which preceded the later FLIP CHIPs."Digital Logic Handbook", pg. 56 They connect to the units they are plugged into via a set of 22 gold-plated discrete pins along one edge."System Modules", pg. vii
They use 30 Megacycle Modules"
/ref> In addition, special modules were available for purposes such as
DEC Building Block Logic manual from the Computer History Museum, dated September 1960Digital Logic Handbook, Third Edition, dated March 1961
New Module Accessories, dated February 196430 Megacycle Modules, dated September 1964System Modules, dated 1968
{{Digital Equipment Corporation DEC hardware *
System Modules (originally known as System Building Blocks; the name was changed around 1961) are a DEC modular digital logic family which preceded the later FLIP CHIPs."Digital Logic Handbook", pg. 56 They connect to the units they are plugged into via a set of 22 gold-plated discrete pins along one edge."System Modules", pg. vii
They use transistor
A transistor is a semiconductor device used to Electronic amplifier, amplify or electronic switch, switch electrical signals and electric power, power. It is one of the basic building blocks of modern electronics. It is composed of semicondu ...
inverter circuits, with the transistors operating saturated, to avoid dependence on tight tolerances; they use -3V and 0V as logic levels. Intended for prototyping as well as production, they include design features intended to avoid damage. They are provided with design advice which includes loading rules and wiring instructions."System Modules", pg. 4.1-4.9
They were available in several compatible speed lines:
* 4000-Series: the second series, nominally 500 KHz, but some 1 MHz"System Modules", pg. 6.1-6.40
* 1000-Series: the original series, nominally 5 MHz"System Modules", pg. 7.1-7.16
* 6000-Series: higher speeds, nominally 10 MHz"System Modules", pg. 8.1-8.13
* 8000-Series: very high speeds, nominally 30 MHz/ref> In addition, special modules were available for purposes such as
Input/Output
In computing, input/output (I/O, i/o, or informally io or IO) is the communication between an information processing system, such as a computer, and the outside world, such as another computer system, peripherals, or a human operator. Inputs a ...
(I/O) converters (to standard internal voltages), bus drivers, lamp and solenoid drivers, A/D conversion, relays, core memory drivers, etc."System Modules", pg. 9.1-9.60
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."System Modules", pg. 10.1-10.35
References
;Citations ;Sources * * *External links
DEC Building Block Logic manual from the Computer History Museum, dated September 1960
New Module Accessories, dated February 1964
{{Digital Equipment Corporation DEC hardware *