DevilledEggs wrote: ↑24 Nov 2021, 22:46
I found out you can use an arduino and make a simple oscilloscope with processing IDE and I tried it with my signal generator and it seems to be pretty accurate, out of curiosity what should the waveform look like? Should it be a square wave, a sine wave? My common sense and good bit of electrical knowledge says it should be a square wave but I dont know.
(Another Update) The clock output is a perfect square wave, and it looks crisp. So that isn't the culprit.
It would be a rough square wave (with ripple) and around 6.25 Mhz. I'd take that measurement from the outermost (logically, not physically) output of the inverter chip near the crystal or from the clock input of the program counter or a register. Maybe check at each chip that takes the clock signal.
Now that sounds a tad suspicious, that the signal is crisp. While that is a good sign, that could also mean that other things are not working. I mean, if it is perfect with no ripple, then maybe it is not reaching the program counter (or there is another reason it might not be advancing) or some other chip that needs it (like the Accumulator). The clock transitions of the devices that use the clock are expected to add ripple to things such as the clock (and power rails, hence all the tiny capacitors).
I guess you could test the lowest bit of the program counter (at the lowest-ranking chip). You should expect roughly a 3.125 Mhz signal there (except during jumps). And you could check the clock at that point too on the clock-in pin of the program counter chips. If that is as expected, then maybe check the clock signal at every register too, particularly the Accumulator, X, and Y. Since the lights are stuck, the Accumulator would likely be more relevant.
Checking to make sure the power supervisor is installed the correct way would make sense, that its flat edge is turned the same way as the silkscreen on the board indicates.
On diodes, the instructions seem clear to me. You bend the ends with the cathode band and put the other end in the holes with the circle drawn. The bent end from the cathode marking goes into the unmarked square pads.
"The diodes D3 and D4 lay flat.
The stripe on the diode should match the marking on the
board. Diodes D9~D36 are standing up. So for these, only
bend the pin on the side that has the black ring. That pin
goes into the square padded hole, the other in the round
padded hole. In short: the diodes are on the left with the
black ring on top, the wires are on the right."