Programming instructions

Input-Output Devices

All of the Input-Output Devices discussed below can be controlled by the

Real-Time Option, Type 25. The Real-Time Connection, furnished as

standard equipment, provides communication between the Internal Proc-

essor and the Perforated-Tape Reader, the Perforated-Tape Punch and

Control, and the Printer-Keyboard and Control. All devices except the

Perforated-Tape Reader are optional. This section is arranged in the order

of increasing complexity of connection.

PRECISION CRT DISPLAY, TYPE 30A

Data points are displayed on a 9% inch by 9% inch area. Information is

plotted point by point to form either graphical or tabular data. Two digital-

to-analog converters drive the deflection yokes in the X and Y directions.

Data can be plotted at a 20 kc rate, or every 50 miscroseconds.

The program loads the AC with a point to be plotted. Bits 0 through 8 specify

the X co-ordinate of the point and Bits 9 through 17 the Y co-ordinate. The

C(AC) are then transferred to the Display Buffer. The specifying of the

point initiates the plotting of the point on the CRT.

DRECISIOI\

TYPE 30A

PIG

Status Sits:

NOM

Program Interrupt:

NOW2

Figure 10 - Precision CRT Display, Type 30A programming logic