TDL 16K Static
RAM Board.
This was part or TDL's
initial 3 card set complete microcomputer system. (If anybody has a better picture
please forward it to me I will put it here).
The board had the following
features:-
The Z16 was a low power, very fast access, static memory
board capable of supporting 16K of memory on one card.
The card is divided into four blocks of 4K each, which can
individually be switch protected, addressed, etc. Each 4K block may be located
at any 4K page border, irrespective of the selected address for any other 4K
block in the system. (Save only that no two blocks may occupy the SAME address.)
The memory chips employed are the EMM SEMI 4200, which are
organized as 4K by 1 bits, and which feature a currently rated access time of
200 nanoseconds. Each 4K block uses 8 memory chips, making a total of 32 for
a fully populated board. Due to the treatment of each 4K block as a separate
unit, the board may be populated in 4K increments, and thus may serve as an
expandable 4,8,12 or 16K memory on the same card.
Physically the board is organized around the S-100 bus It
follows the specifications as to the number of TTL loads per line, physical
dimensions etc. as have been laid out for this standard. The board operates
equally well in either an ALTAIR or an IMSAI, as well as in Technical Design
Labs1 own line of microprocessors.
Only the finest components and materials have been employed
in the manufacture of the Z16, and no surplus components are employed at any
location.
The typical power consumption from each of the three voltage
supplies for a fully populated 16K board are 200ma from the +5, 12 0ma from
the +12 and 20ma from the -5. Thus, a fully populated 16K board draws little
or no more power than "low power" 4K boards available from other manufacturers
- thus demonstrating a 4:1 power savings.
The manual for this board can be obtained
here.
Other TDL S-100 Boards
SMB
Z16-RAM
ZPU
32KRAM
This page was last modified
on 01/08/2011