TFW8b cartridges cases.
an earlier version of the PCB, but you can see the various sizes.
my Tindie store, or direct from TFW8b.
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Reset buffered through 7417
POKE 59426,0will set all the outputs low. A word on states and levels here. Writing 0 to one of these outputs pulls the bus line low, this is the 'asserted' signal, and means it is active. When no device is asserted, the signal is pulled high by pull up resistors, 'released' to high. Nothing will ever drive the bus high, all they do is let it float or pull it low. To read it back, type
PRINT PEEK(59424)That should show 0. If it does not, there is a problem with PIA#1 or one of the MC3446 buffers. You can then try various other values up to 255 which should have all the output lines high. Testing other pins is a little more complicated, this table shows the values to poke and peek at.
Write 0 (Assert)
Write 1 (Release)