Macrotech -- 128K Static RAM

This was an early Macrotech S-100 board. It came out in mid-1983.

The board contained 128 Kilobytes of 70NS CMOS static RAM all on one board. It had a 6-layer printed circuit board which provided ultra high stability.  It was designed to operate in any S-100 system, (IEEE or non-IEEE). There was external battery backup capability. There was a 16-bit addressing option and a memory mapping system they called  (M³) "bank select" that  allows each 4K block of the 16 bit (64K) logical addresses to be dynamically translated to any 4K block of the128K on-board physical memory. Being IEEE-696 of course it took an 8 or 16 bit data path.  The problem was at the time it was quite expensive ($1300). Two 64K static boards were far cheaper.

I do not have a copy of the manual for this board. If you can share one please let me know.

Other Macrotech  S-100 Boards
128K RAM    256K RAM   1MG RAM   2MG RAM     V-RAM    80286    ADIT    80386