Hello to all AFmembers,
while waiting for the CFFA1 to arrive ( i want to test the expansioncards in all possible configurations
with the CFFA1 too, to ensure that no interactions interfere with the CFFA1 )....
In the meantime I started to make a kind of simple disgnostic card on one of the prototypecards consisting
of the adressdisplay with LEDs and a "single step" switching logic as described in the apple-1 manual at page 12.
In that circuitplans there is a signal used, labeled as SYNC. In fact i have searched the remaining plans
at page 14 and 15 and i haven´t found that signal there anywhere.... it´s also not labeled at the apple-1 slot !
Here the prototyp card with the chips numbered according to the page 12 parts shown below too:
here the plan for display of the adressinglines with LEDs:
and here the part that displays the single step logic:
another problem is that the signalnames labeled to the 7474 don´t match with the pin names displayed in the
At the moment i am trying this by a kind of "best guess".....
if anybody has idea about the correct pinouts of the "single-step plan" corresponding to the datasheet
any idea where to locate / or what signal from slot is to be used as "SYNC"
any kind of feedback here would be welcome....