Programming instructions

INPUT-OUTPUT SKIP FACILITY (LOCATION 2H06)
There are 8 inputs to Input-Output Skip. The iot pulses from the Device
Selector strobe an input line and if a logic condition is present, the instruc-
tion following the iot will be skipped. The conditions for skipping are:
-3 volts
I
skip
0 volts
do not skip
The iot skip pulse must occur at event time 1 of the iot instruction.
The IOS consists of a Capacitor-Diode Gate, Type 4129. The input con-
nections are:
IO Device Device Selector
Input Connection Pulse Connection
F E
J
H
L K
N M
T S
V U
X W
Z
Y
PROGRAM INTERRUPT CONTROL (LOCATION 2H05)
Eleven Program Interrupt lines are available. Any one of the 11 signals
may cause an interruption of a program. All signals are identical; the
polarities are:
-3 volts interrupt the program
0 volts
I
no effect
The connections from IO devices which request program interrupt are
made to module 2H05 at pins E, F, H, J, S, T, U, W, X, Y, and Z.
DATA INTERRUPT CONTROL (LOCATION 2E13)
The signal levels associated with the DI are shown in Figure 30. In trans-
ferring data, the Memory Address is first transmitted to the Memory
Address Register on 13 lines from the external source. Data is next trans-
ferred to or from the MB on 18 + 18 lines.
Incoming data is received from 18 lines and placed in the Memory Buffer
and on into Memory.
Outgoing data from the Core Memory addressed is transferred to the
Memory Buffer and appears on 18 lines for sampling by the IO device.
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