Cromemco 64KZ-II Dynamic RAM Board
Cromemco almost from the start decided
to build their systems with dynamic RAM memory cards. They started with 16K
cards but later moved to this very reliable and popular 64K RAM card.
There were a few variations of the basic
card. The 64KZ-II being the most elaborate and flexible. There were
multiple switch settings required depending on if the card was to be used in a
single user 64K system or multiple cards in a multi-user system working with
their Cromix system. Up to one of 8 banks of boards could be individually
selected (by outputting a bit to port 40H). The board did not utilize the
refresh signal from the Z80 CPU card but instead had it's own onboard refresh
controller.
The manual for the 64KZ-II can be
obtained for this board
here.
The manual for the original 64KZ can be
obtained
here.
Other Cromemco S-100
Boards
ZPU
SBC 4KRAM
16K RAM
64KZ RAM
64KZ-II
RAM
256KRAM
8KBytesaver Bytesaver-II
16KPROM
32K Bytesaver
4FDC 16FDC 64FDC
WDI WDI-II
STDC
4PIO
8PIO TU-ART
D+7A I/O
Dazzler PRI
GPIB Board
XMU
XXU
Other Boards
This page was last modified
on
01/08/2011