It is in the middle of the sound test right now, just about to start pass #2. If you do have a hanging/crashing problem then you may or many not see any flagged chips.įigure 3 shows the diagnostic running, at the end of one pass #1. The diagnostic requires no user intervention and will red-flag suspect chips as it finds them. The keyboard is unplugged internally and there is the dongle installed on the keyboard connector. If you have RAM, ROM or I/O port troubles, then this will usually find it.įigure 2 shows the fully installed setup. It is not good at detecting hanging and crashing problems. The diagnostic kit is fairly good at detecting reproduceable errors. The square cartridge on the left is the user port connector, which brings all the signals back from the various ports via the cable assembly. The cartridge is the square module near the top-right with the label on it. The serial dongle is not connected to the wiring harness, and the schematic is correct. The center serial dongle is tethered to the diagnostic cable harness with a shoelace just so I wouldn't lose it.
The small green module in the bottom of the picture is the keyboard dongle, which is placed on the mainboard keyboard connector and simulates a key being pressed. I've had this since sometime in the mid-80's when I was an authorized Commodore repair center.įigure 1 shows the cable assembly used in the diagnostic setup.
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