IMSAI 8080 System
General Assemnxy and
Test Instructions
MAINFRAME ASSEMBLY
Assembly of the'mainframe consists of the following steps:
•Power supply installation
•Mother board installation
•Connection between power supply and mother board
•Installation of CP-A panel.
•Connection of power supply and front panel
POWER SUPPLY INSTALLATION
Remove #8 hardware from transformer on Power Supply p.c. board.
Take care to not let the transformer damage the p.c. board. Put
the five #8 screws in the cabinet bottom and secure with the 8-32
threaded spacers. Install the four V - 20 nuts and spacers for the
transformer similarly. Carefully lower the Power Supply Assembly
onto the mounting screws so all the screws extend through the board
Fasten with washers and nuts. See Figure 1. Complete the power
supply by attaching the capacitor brace plate to the bases of the
large capacitors with the adhesive backed foam tape on one side of
the brace plate.
MOTHER BOARD INSTALLATION
Attach the Mother board to the cabinet base with the hardware sup
plied with the Mother board as shown in Figure 2. The front 100-
pin connector should be located in frort of the sheet metal front
frame to accomodate the CP-A assembly.
CONNECTION BETWEEN POWER SUPPLY AND MOTHER BOARD
See the wiring drawing in the Power Supply chapter. Connect the
following wires between the Power Supply and the system:
a) 1 or 2 #18 gauge wire from holes at edge of -16 volt plane
to -16 volt trace on Mother board.
b) 1 or 2 #18 gauge wire from holes at edge of +16 volt plane
to +16 volt trace on Mother board.
c) 2 or 3 #14 or #12 gauge wire from +8 volt plane to +8 volt
bus on Mother board.
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