Programming instructions

next row. A flag indicates that the buffer is ready to load. The commands

for the Card Punch Control, iot series 64, are:

cpsf - 706401 - Skip if Card Punch flag is a 1. The Card Punch flag indicates

the Punch buffer is available, and should be loaded.

cpcf - 706402 - Clear Card Punch flag.

cpse - 706442 - Select the Card Punch. Transmit a card to the 80column

punch die from the hopper.

cplb - 706406 - Load the Card Punch buffer from the C(AC). Five load in-

structions must be given to fill the buffer.

0 100 200 300 400 500 600

108

572

CPSE*

Punch 0 -

Flag

ulJu’uLluuuuu~u

CPLR

(5)

Load

Buffer

Time

Punch

Action

I I I I I I I l l 1 1 1 USed

Only

To Clear

Flag

‘CPSE Must be Given to Maintain

Maw Rate. A Delay of 600 or 1200

MS Will Exist on Starting.

Figure 26 - Card Punch timing

Since 18 bits are transmitted with each iot instruction, 5 iot instructions

must be issued to load the 80-bit row buffer. The first four loading in-

struction fill the first 72 bits (or columns); the fifth loads the remaining

8 bits of the buffer from AC bits 10-17.

After the last row punching is complete, 28 milliseconds are available to

select the next card for continuous punching. If the next card is not re-

quested in this interval, the Card Punch will stop. The maximum rate of

the Punch is 100 cards per minute in continuous operation. A delay of

1308 milliseconds follows the command to select the first card; a delay of

108 milliseconds separates the reading of cards in continuous operation.

The Card Punch flag is connected to the Program Interrupt, and to bit 13

of the iors instruction. Faults occurring in the punch are detected by status

bit 14 of the iors and signify the punch is disabled, the stacker is full, or

the hopper is empty.