IBM 29 User Manual

PUNCH-OUT CYCLES (LEFT-ZERO KEY)
Starwhee I 2 or 3
First
90 180 270
I
I
I
Second
0
90 180 270
Thi rd to Last
1
Last
1
l 90 180 270
90 180 270
Starwheel 12
I i1L~--+---+--~--;...-~ P......--1---1--"""'1
I If
79
175-P4~ P2-79 175-P4 ~-79
R315,224, 325
R304
175-P4 175-P4
1----4 ~....,._---+____. i-+----i--r
-f5 Left Zero l
I J10-P3 P6-158 J1LO-P3 P6-158
R309
Key Pressed
P2-79
"A" Register Relay
"B" Register Relay
326-3 Stwh 2 P2-79 J6-P5
1
~-79
~-----+----tl---11 l,.._,
1 "A" Register Relay
P7-10p3 P6 10 p3 P6
P7-10
Interposer Magnet
Punch Clutch
Escape Magnet
Keyboard Restore
28-P6
R326
R317
86 326-2, P5
r
Figure 1-8. Punch-out Timing ( 8-Column Field)
energizes the zero interposer when the condition of
no relays picked exists.
The keyboard was restored at 20° by P6 and is held
restored by the N/o 5-point of the punch-out relay
( 317) to +4B volts, for the rest of the left-zero field.
The escape magnet is energized by the interposer bail
contacts, and Pl ( 180°). The escape armature contact
makes, energizing the escape interlock relays. This
allows the punch clutch to be energized for the next
cycle. In our example, during this cycle we energized
the zero interposer magnet, and escaped to column 10.
Read-out, Punch-out Cycle 2: During this cycle we
punch the information that was transferred from regis-
ter lA to the interposer magnet during the last cycle.
We transfer the information from register to register
and energize the interposer magnet for the digit to be
punched during the next cycle. The punch clutch will
not latch up for the rest of the left-zero field.
At 10° the information in B-registers will be trans-
ferred to the next A-register (Figure 1-B) All A-regis-
ters are held until 166° by P6 and P5; the lA register
is held until 10° of the next cycle by P7. The transfer
317-2 2°
P7 10
)
of information from the registers on this cycle and the
rest of the punch-out cycles is allowed to occur through
N/o 4 points of the P-cam-gate relay ( 309) and the
6-point of the punch-out relay ( 317) and P3.
At P5 time, the interposer magnet is energized
through the decode tree. The interposer bail contacts
close, energizing the escape magnet. The escape arma-
ture contact energizes the escape interlock relays. The
punch clutch is energized through Pl, the escape inter-
lock points, and P2. At B6° ( P5) the information in
registers BA through 2A is transferred to registers BB
through 2B and retained there until 79° of the next
cycle. In our example, we energized the interposer 0
magnet, punched zero in column 10, and escaped to
column 11 during this cycle.
Read-out, Punch-out Cycle 3: During this cycle we
punch information that was set up in the last cycle,
transfer new information to the interposers, escape to
a new column, and initiate a punch-clutch cycle. At
10° the information is transferred from the B-registers
to the A-registers. The A-registers are held until 166°,
the lA register is held until 10° of the next cycle. At
B6° the information is transferred from register BA
1-9

IBM 29 Specifications

General

Brand	IBM
Model	29
Category	Computer Hardware
Language	English