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It had all the things learned from the previous boards. The 256KZ could automatically switch from contiguous memory addressing when used with the Cromemco DPU based 68000 board to bank selected memory when using a Z80 system. Switch settings on the board determine the address range for the 68000 memory space. The custom PROM plugged into the IC39 socket determines the memory banks selected in Z-80 systems. This means that with Cromemco's dual processor D-series systems you could use either the Z-80 or 68000 Cromix Operating System interchangeably, without changing any settings on the 256KZ memory board. If the custom PROM was removed the board operated in just the 68000 mode. The 256KZ was byte-addressable or word-addresseable. During Z-80 memory operations eight bits of data are transferred at one time, while with 68000 memory operations, 16 bits of data are transferred at one time. In this way/ there is no speed degradation when using the 256KZ with a 68000 board.
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This page was last modified on 10/25/2013