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This is my Programming Panel board, that replaces the DIP switches and other input controls of the CPU
The board utilizes Digistat Series switches made by C&K Switches. They are available in toggle switch or momentary button form, and with 1, 2, or no LED embedded. Multiple key caps and LED colors are available.
It uses three 16-pin IDC connectors and ribbon cables to connect to the SAP breadboards, using 16 pin crimp connectors that have the same pin spacing as a standard 300 mil chip.
Closeup of the panel.
The "Red, No LED" cap for the Reset button was out of stock at the time I ordered, so I simply removed the LED from an existing button. I'll replace that one of these days.
8x Data toggle switches, red key, red LED - Show current state of the data bus, and the keys assert to the bus in program mode
4x Address toggle switches, red key, yellow LED - Shows status of MAR, and sets a RAM address when in program mode
"Prog" toggle, grey key, dual LED - Switches between Run (green) and Program (red) modes
"Run" toggle, black key, green LED - Switches clock between Run and single step mode. The LED flashes on each clock pulse
"Step" button, blue key - Single steps the clock when not in Run mode
"Store" button, yellow key - Writes value set on Data switches to RAM at address set on Address switches
"Reset" button, red key - The system reset button
Ribbon cable view
EasyEDA 3D rendering
I made some last minute changes to my key color usage.
"Store" being the same as "Data" didn't look too nice, and red seemed more fitting for a reset button anyway.
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