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a stored program or while entering data into core
storage from the typewriter keyboard.
Manual mode is initiated and the Manual light is
turned on by the execution of a Halt instruction or
by pressing the Release key (on an
I/O
operation
only), Instant Stop key, or Stop key. Pressing the
Start key, the Insert key, or Display MAR key initiates
automatic mode and turns off the Manual light. The
Save and/or the No Feed light can be on when the
Manual light is on.
Both the Manual and Automatic lights are on when
an instruction is single-cycled with the SCE key.
Reset Key. The Reset key is used to mask all inter-
rupts (1710 Control System) and to restore all ma-
chine status indicators, machine check indicators, and
signal lights to their initial or reset condition. The
Reset key can be used only when the computer is in
the manual mode. When the computer is in the
automatic mode, the Reset and Release keys can
be pressed simultaneously to effect a reset.
Insert Key and Insert Light. Depression of the Insert
key places the 1620 in automatic mode. Pressing the
Insert key also turns on the Insert light and activates
the typewriter keyboard so that direct entry of up to
100 characters may be made in numeric mode, start-
ing at 00000 and continuing into higher-numbered
storage positions. The Insert key is operative only
when the computer is in the manual mode.
Save Key and Save Light. Pressing the Save key turns
on the Save light and saves the address of the next
sequential instruction to be executed. This address
is saved in Product Address Register 1 (PR-l). If a
multiply operation is performed before the saved ad-
dress is used, the saved address is lost because the
contents of PR-1 are decremented for each new mul-
tiply digit during a multiply operation.
Release Key. When this key is pressed, manual mode
is initiated, the Manual light is turned on, and the
Insert light is turned off.
The release key is operative only when the com-
puter is in automatic mode and is performing an
110
operation.
Stop/SIE (Single Instruction Execute) Key. Pressing
the Stop/SIE key stops the
com~uter
in manual mode
at the end of the instruction being executed when
the key is pressed.
The Stop/SIE key also serves as a single instruction
key. Successive depressions of the key cause one in-
struction to be executed for each depression. The
Manual light remains on.
56
Instant
Stop/SCE
(Single
Cycle
Execute) Key.
Pressing the Instant StOp/SCE key causes the machine
to stop at the end of the 20
ILsec
machine cycle in
progress when the key is pressed. Successive depres-
sions of the key cause single machine cycles. Both the
Manual and Automatic lights remain on.
Check Stop Light. The Check Stop light is turned on
when the machine stops because of a parity check.
One or more of the Parity or
I/O
Check indicators
that caused the stop is also on. The Check Stop light
is turned off when the check indicators are reset or
the Parity or
I/O
switch is set to PROGRAM.
Display MAR key. The Display MAR key operates
only when the Manual light is on and the Automatic
light is off. Pressing the Display MAR key causes dis-
play of the MARS register to which the MARS Display
Selector switch is set.
The Rotary switch should not be turned while the
Display MAR key is pressed.
Reader No Feed Light. The Reader No Feed light is
turned on when the computer attempts a paper tape
read or card read operation and the reader is not in
. the ready status.
Punch/Disk Interlock Light. This light is turned on
if one of the following conditions exists:
1.
The computer executes a write instruction
using the tape punch and there is no paper
tape on the feed reel.
2.
A parity check occurs while punching paper
tape.
3.
The paper tape supply is exhausted.
4.
The card punch is not ready. This not-ready
sta tus is often temporary on card read and card
punch operations because the buffer is inter-
locked while the read and punch cycles are
in progress.
5.
The 1311 Disk Storage Drive is not ready.
6.
The 1443 Printer is not ready.
Any of these conditions stops the computer in au-
tomatic mode with both the Automatic and Punch/
Disk Interlock lights turned on. When a parity error
occurs, the
I/O
Write Check light is also turned on.
Pressing the Release Key disconnects the punch and
the disk storage drive and puts the computer in man-
ual mode. Pressing the Reset key while in manual
mode turns off the Punch/Disk Interlock and
I/O
Write Check lights. Manual correction and restart
procedures can begin after depression of the Release
and Reset keys.
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