electronic printed circuit board assemblies that implement the following functions, namely, central processors/computers/CPUs, memory, digital input/output, analog input/output, communication, operator display, interrupt and direct memory access control, field signal conditioning, disk controllers, instrument interfaces, and counting and timing; chassis assemblies to hold such electronic circuit board assemblies for industrial and commercial computer and control applications; computer software for development and operation of such circuit boards and chassis assemblies; computerized systems comprised of such circuit boards and chassis assemblies; comperized systems comprised of such circuit boards and chassis assemblies and software; computer peripherals for the development of industrial and commercial computer control applications, namely, Erasable Programmable Read Only Memory (EPROM) device programmers, Programmable Logic Device (PLD) and Programmable Array Logic (PAL) device programmers, EPROM emulators, power supplies, cables, extender boards, cardracks for multiple circuit board assemblies, and devices; general purpose memory devices, namely, Static Random Access Memory (SRAM) and Dynamic Random Access Memory (DRAM) devices