To be able to test everything well, and detect when it is interesting to trigger videos and see also that they strigger correctly, as I do not have the machine, I have designed these boards of the attached photos.
It is about being able to play the machine only with the CPU in the work table, without having to have the complete machine. Not even the controller driver board, which takes up too much space, and needs several voltages to work.
For some time I made a boardf with the 64 switches (8x8 matrix), plus the 8 direct ones that are used for the coin door and the tests. But it's not enough, I need to see in real time the status of all lamps, flashers, bumpers, and of course when the hologram motors, the mirror and the lamp are activated.
This board, connects with the inputs of the CPU, to be able to close any switch on the board, or the direct ones of the coin doors. It also captures all output signals, to show the array of lamps (8x8, 64 insert lamps), power outputs for flashers, bumpers and hologram mechanisms. Everything is shown in RGB LED arrays, and I have also added an expander of these ports, to click on custom boards for each game, I made the Creature (picture attached) with the essential lamps to identify easy and fast.
I need this not only to test the hologram kit, I will also need to play each game on my desk, for the Advanced Coloring for the DMDMK66. I can not have complete machines here, they take up too much space. With CPUs and this board is enough for me, I have CPUs from practically all manufacturers, except Spike (I was left by a friend to add Spike to DMDMK66).
At my desk, bags with material for several pending projects, including the hologram.