Memory Merchant - 64K Static RAM Board This was a fairly traditional 64K static
RAM board for the time with some extra features added in.
The board used 2K X 8-bit RAM (150 nsec.)
chips. Typical chips were NEC UPD4016-3's, Hitachi HM6116P-3's, or
Mitsubishi M585725P's. Speed was in excess of 6 MHz. The board ran with low
power requirements. (435 Ma. max. — loaded with 64K). The board had
Cromemco style Bank Select and Extended Addressing.
It also had a 2K window which can be placed anywhere in the 64K memory map.
It had independently addressable 16K blocks organized as:-
Two independent 32K banks
One 64K Extended Address Page
One 48K and one 16K bank for use with MP/M.
Each 32K bank responded independently to the phantom line.
2716 (5V) EPROMS could replace any or all of the RAM.
The board had field-proven operation in CROMEMCO CROMIX and CDOS.
It also was compatible with EEE 696 systems such as Northstar, CompuPro, Morrow,
IMS, IMSAI front panel, Altair and many others.