Industrial Micro Systems -
Z80 CPU (451) Board
IMS made a number of Z80 CPU boards of
increasing degrees of complexity and sophistication. The 451 was their
The board had really nothing more
than the Z80 CPU and the necessary circuitry to interface to the S-100 Bus.
That said the circuitry was very nicely laid out and clean. Jumper JA (1-3)
allowed 0, 1 or 2 wait states. Jumper JB (1-8) sets the high order bits
for a Power on Jump Hex address and JC (1-2) selects 2 or 4 MHz operation.
The S-100 MWRT (pin 68) can be generated on the board with jumper JE.
The manual for this board can be
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