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Morrow   MM6516S   64K Static RAM
This board was produced when Morrow was known as Morrow Designs.

Morrow 64K Static RAM

The board could be used with Bank select or extended addressing. The bank select feature is switch setable to any one of 256 available I/O addresses and would respond to any one or combination of the eight data bits that are desired. Extended addressing allowed the MM65K16S to reside anywhere in the memory map with no imposed limitations by the addressing range of the microcomputer system. 

The board utilized M58725P or equivalent 2KX8 RAM chips. Interestingly you could pop in 2716 EPROMS as well.
The MM65K16S draws an average of 500 milliamps of current with code executing in RAM and some boards have measured considerably less under the same circumstances. With such a low current drain, it is obvious that only 1 regulator was all that was needed, but for those planning to use a programmed 2716 EPROM or equivalent PROM, extra current demands can easily be met by the three on board regulators. For those dedicated applications where both RAM and ROM are needed, the MM65K16S RAM Board really fit the bill.

The Morrow Designs MM65K16S was guaranteed to run with any 8080, Z80, or 8085 processor on the market at that time. This included some of the new 6 MHZ processors that were beginning to surface. In fact, the MM65K16S was guaranteed to run reliably with processors that  have  clock  speeds  up  to 6  MHZ.
The manual for this board can be obtained here
Morrow S-100 Boards
24K RAM   64K RAM    Disk Jockey FDC     Multi I/O    SuperRAM     SwitchBoard    Z80 Board    Hard Disk Controller

DJ-DMA FDC  8K DRAM    HDC-DMA Controller


This page was last modified on 05/04/2016