- Other Boards
In the Summer of 1984 SD Systems
expanded their name to "Syntech Data Systems" and introduced a number
of great looking new boards. They ran these boards in two full page
adds in The Microsystems Journal (August). I have never seen these boards
and am not even sure if they were ever produced in any significant numbers.
If anybody has further information on these boards please let me know.
This was a dual processor board consisting of a Z80 (4MHZ) and an 8MHZ 8088.
It had an onboard FDC which had 24-bit DMA capability and ran 5" & 8"
drives. There was an 8K onboard monitor/ROM. There were 2 serial boards
running up to 19.2 K Baud. There was also an onboard interrupt controller
and a real time clock chip.
256K Static RAM
SD Systems were well known for their dynamic RAM boards. This was their only
static RAM board -- and a good one at that. It was completely IEEE-696
compatible handling 8 and 16 bit data paths. It uniquely also had on
board a backup battery and a real time clock/calendar chip.
2MB Dynamic RAM Board
This board could be configured as a regular RAM board or as a memory disk.
It was completely IEEE-696 compatible handling 8 and 16 bit data paths.
It utilized 150ns RAM chips.
This was clearly an upgrade of the SD Systems
. The board sported a 4
or 6MHZ Z80, 64K of dual ported Dynamic RAM, 2-16K of EPROM's, Memory
addressing to 16 MBytes. It also had a serial port, a parallel port and and
a counter/timer. It was completely IEEE-696 compatible.
This was a major upgrade of the
It had all the things the Versa floppy-II had but also you could
control up to 3 Winchester hard disks. data transfer could be
either Port I/O or via DMA. The hard disk had 20 bit single and 4 bit
double burst detection span on 256 byte sectors. It was completely IEEE-696
Hard Disk Controller
This board could support up to 4 ST506 Hard disks. It also had two serial
ports (up to 19.2 K Baud) and one parallel port. There was onboard memory
for full sector buffering. It was completely IEEE-696 compatible.
SD Systems S-100 Boards
VersaFloppy I & II
I/O8 Serial Board
This page was last modified