IMSAI - VIO Board
The VIO was a later IMSAI board.
The VIO interfaced to the computer as a
4K byte block or memory. 2K was used to store the display and 2K was utilized
for software in ROM. The onboard RAM was 16 2102's. IMSAI had their
display memory at 0F000H by default. With the ROM software at F700H. The
display was up to 24x80 characters/screen. It was targeted primarily for the
ill-fated VDP-80 system. The board also contained a fairly elaborate
system monitor program in its ROM's to read paper tapes, cassette tapes or boot
disks. Composite video was the only output through a coax cable (top
left).
The manual for this board can be seen
here.
G
ary Sabot wrote a nice
review of programming graphics for this board in March 1981 for Microsystems
(Vol 2, #2, p30). It can he seen
here.
Other IMSAI S-100 Boards
4KRAM
8080CPU
EPROM-Programmer
MPU-B
PIC-8 PIO
PROM-4 SIO
VIO
MIO
FDC (FIB/FIM)
This page was last modified
on
01/08/2011