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4 output or 4 input ports are being installed, they
would normally be installed from left to right as
the address of the output ports; for instance:
address 0 for position A3 and address 3 for posi
tion A4.
similar fashion from low to high address left to
right, starting with position A5 and going to
position A
first can be made according to which addresses
desired on the input or output ports.
( ) 12. Insert and solder the twelve .luF capacitors at
locations Cl through C
shown on the Assembly Diagram.
citors are pulled
applications where the PIO board will be used in
place of a front panel for programmed output in
dedicated processor uses, care should be taken to
lay the
the lowest LED position.
nothing in the upper half of the board extends
higher
are to be mounted, they can be mounted at this
time.
( ) 13. Insert and solder the two 33UF tantalum capacitors
at locations C7 and C
Diagram.
on the board.
{ ) 14. Insert and solder the 32 L E D 's at locations L10
through L17, L2Q through L27, L30 through L37, and
L40 through L47 as shown on the Assembly Diagram
for PIO 4-4; the 7 LED's-at locations L10 through
L17 for PIO 4-1 as shown on the Assembly Diagram.
Take a piece of cardboard, plastic or aluminum
and cut it to approximately 3/8" wide for a strip
about 3/4 inches long and then cut up the center.
Don't cut all the way, so that the center saw cut
can be placed on either side of the LED's leads,
and the LED's can then be pushed into the holes
and against the 1/8 inch spacer and soldered.
tool is then removed, and the LED should have a
uniform spacing of 1/8 inch above the board.
220 ohm or 230 ohm LED resistors should also be
installed at this time if the LED's are installed.
These are user supplied resistors and are not pro
vided by IMSAI.
16
8
The input port chips are arranged in a
.
The choice of positions to be filled
8
6
in close to the board.
disk ceramic bypass capacitors below
. 1
off the board than the LED's.
8
NOTE: Observe polarity (+ to +) as shown
PIO 4, Rev. 2
Assembly Instructions
and C9 through C14 as
Be sure the capa
This is to insure that
as shown on the Assembly
In
If LED's
The
The
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