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モニター Donn Steward CPUville 8-bitのPDF 取扱説明書をオンラインで閲覧またはダウンロードできます。Donn Steward CPUville 8-bit 14 ページ。 Processor register display kit

Testing and Using the Register Display

Plug the ICs into the sockets, being careful not to bend under any pins. A bent-under pin can look like a

properly inserted pin from the top.

The register display can be tested by putting +5V and ground onto pins 1 and 50 of the display

connector, respectively. Because the inputs to the buffers are not connected in this condition, they will

assume a high level, and the LEDs will light. Then, you can ground the pins on the display connector

one-by-one. The corresponding LED should go out. Pins 7, 9, 11, 13, 14 and 15 of the front panel

connector can be tested in the same way. The clock selector switches connected to pins 2, 4 and 6 can

be tested for continuity with pin 12 of the 16-pin front panel connector when closed. The switch

connected to pin 8 can be tested for continuity with pin 10 when closed. The pushbuttons can be tested

for grounding pins 1, 3, and 5 when closed (pressed).

To use the display, remove the control board from the processor stack and connect the 50-conductor

ribbon cable to the display connector on the main board. Then replace the control board, being careful

to line up the receptacle on the bottom of the control board with the control connector header on the

main board. Turn off the switches on the control board, because you will be using the switches on the

display board to control the computer. Place 0.5 inch male/female standoffs on the threads coming

through the mounting holes on the control board. Then connect the 50-conductor cable to the display

connector on the display board. Line up the front panel connector on the bottom of the display board

with the 16-pin header on the control board. If lined up properly, the mounting holes will be in line

with the standoffs on the control board. Put the female standoffs (nuts) onto the threads. The display

board should show activity when the computer is powered up.

The switches and pushbuttons on the display board correspond to the switches and buttons on the

control board, and are used the same way.