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At the heart of this design were the Multibus CPU, memory, and video display cards. The cards used in the Sun-1 workstation were a second-generation design with a private memory bus allowing memory to be expanded to 2 MB without performance degradation. The Sun 68000 board introduced in 1982 was a powerful single-board computer.
The reckoning board, also called a memory board or hole board, could be used on its own as a basic counting device or used with an abacus for engineering. There were two types of reckoning board. The older type was a simple 10 × 10 grid of holes. A peg would be inserted into a hole and moved along, starting from the top and working downwards.
He then sold 4 KB S-100 memory boards before attempting a new computer with Howard Fullmer in 1977. Front view of a Micro Decision MD-2 The Equinox 100, sold through Fullmer's company Parasitic Engineering , was a powerful machine in an attractive cabinet, but failed to attract much attention as it used an 8080 at a time when the Z80 was ...
Famous 1980s expanded memory boards were AST RAMpage, IBM PS/2 80286 Memory Expansion Option, AT&T Expanded Memory Adapter and the Intel Above Board. Given the price of RAM during the period, up to several hundred dollars per MiB, and the quality and reputation of the above brand names, an expanded memory board was very expensive.
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In a particular implementation, a special board is added to a computer, which controls the allocation of banks to memory space. The control board has its own memory chip. A computer can write data into this chip, but only the control board itself can read the chip, [note 1] hence it is dubbed "write only" memory. [7]: 200–202
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