represent, in the unpacked format, one alphabetic
or numeric character, or two numeric digits in the
packed format. Data is represented in HSM in the
Extended Binary-Coded-Decimal Interchange Code
communicates with peripheral
devices through eight I/O channels.
Each peripheral device contains its own control
electronics in order to transmit to the processor
the status of the device, and any error conditions
generated by an I/O command.
Each channel is a separate simultaneous mode, allow-
ing execution overlap with other channels and the
0 termination interrupt is included
in the system to facilitate efficient use of these
powerful overlap capabilities.