PICT3305.JPG
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Detail of micro-coding card
'Up-level' instruction were decomposed in a serie of elementary micro actions
(ex reading of memory data, adding and storing result back into memory)
Remenber that a reading of data, must be automatically followed by a writing of the same data:
core memory data are deleted by reading.
Each elementary action were coded by diodes.
We can see here the description of elementary instruction.
Note: a diode can give a 0, and the lack of diode gives a 1. [one diode per bit!] (or reverse)