For programmers a code card was provided,
a reference card containing all important numbers.
The first side
displays three tables of addresses in the memory,
to or from these patterns the data was
read or written from/to the buffers.
These buffers interfaced with the printer,
the card-reader and the read-punch unit.
The second side
displays a table with the codes for the 39 instructions.
This table cdisplays six columns;
- The numeric-code of the instruction,
- the meaning of M, the operand-address,
- the meaning of C, the address of the next instruction,
- the description of the the action,
- the time needed for these instructions and
- pointers to the notes.
The third side
- the notes,
- the abbreviations and
- the special bit-patterns to address the registers.
The fourth side
displays two tables
with the bit-patterns of the machine-code and of the RR-code,
referring to the results of the two translating-instructions.
And one table with the values of odd bit-combinations.
These codes were specific for the USSC90,
the USSC80 used differend A/N-codes.