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Computing (FOLDOC) dictionary
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A processor made by Western Digital, consisting of at least
four separate integrated circuits, including the control
circuitry unit, the ALU, two or four ROM chips with
microcode, and timing circuitry.
The ALU chip contained twenty-six 8-bit registers and an
8-bit ALU, while the control unit supervised the moving of
data, memory access, and other control functions. The ROM
allowed the chip to function as either an 8- or 16-bit chip,
with clever use of the 8-bit ALU. Further, microcode
allowed the addition of floating-point routines (40 + 8 bit
format), simplifying programming (and possibly producing a
floating-point coprocessor).