IBM 1620 Manual page 34

Single Cycle 1622 Read Operation
1) Jumper A2 B23 H to A2 E26 F and A2 All B to
A2 E26 A (or any other unused inverter) - Allows
CE clock start.
2) Remove SMS card at A2 C07 - Prevents error stop
of machine.
3) Remove SMS card atA2 B23 - Prevents automatic
c lock start.
4) Remove PM Relay #3 - Opens #2 read CLC circuit.
5) Transfer the following switches:
a. Override switch
b. Off I ine switch
c. Single cyc Ie switch
d. Read select switch
6) Run any card with all 80 columns punched through
read feed (any punches) - Loads RB-1 cores.
7) Single cycle the UT ring for RB-1 to A1Bl transfer-
RB-l I ight should be on for all positions •.
8) Again single cycle the UT ring to check RB-l to
AlB 1 transfer - RB-1 I ight should be out and AlB 1
lights shou Id be on for all positions.
9) Ground A2 013 F - Collector Pullover Read Trans
Accu Latch.
10) Single Cyc Ie the U T ring for AlB 1 to A2B2 transfer-
A1Bl and A2B2 lights should be on for all positions.
11) Replace PM Relay #3 and remove PM Relay #2 -
Opens # 1 read C LC ci rcu it.
12) Run any card with all 80 columns punched through
the read feed. (Any punches) - Loads RB-2 cores.
If display of other than a 12 punch (CAB bits) is desired,
follow Steps 13 and 14.
13) Remove the SMS card at A2 013 (Read Trans Accu
Latch) - Prevents continuous reset of Reader Scan
Ring Latches.
14) Advance Reader Scan Ring as follows:
Ground A2 E 18 A (RSRB advances)
Ground A2 E 17 A (RSRA advances)
Repeat alternately to advance ring 9-8-7-6-5-4-
3-2-1
Then Ground A2 E21 F (RSRB advance P)
Ground A2 E22 E (RSRAadvance P)
Repeat al ternately to advance ring 0-11 •
15) Single cycle the UT ring for RB-2 to A2B2 and
buffer transfer - AlB 1 I ights out and A2B2
I
ights on.
16) Again single cycle the UT ring to check RB-2 to
A2B2 and buffer transfer - A2B2
I
ights out, single
character register displays bit structure of character,
Reader Scan Ring was set for
3.28
17) Repeat 16 - Bufferwrong - inhibit, trouble.
Single Cycle 1622 Punch Operation
1) Load 1622 Punch Buffer with all positions having
the bit structure (same character) as follows:
a. Insert 3600100 00100
b. Rei Start, type in 80 characters (same char-
acter)
c • Insert, type in 38 00100 00100
4900000
d. Run blank cards in and punch several cards
e. Stop machine
2) Jumper A2 B23 H to A2 E26 F and A2 All B to
A2 E26 A or any other unused inverter (Allows
clock start)
3) Remove SMS card at A2 C07
4) Remove SMS card at A2 B23
5) Remove Relay 32
6) Transfer the following switches:
a. Override switch
b. Off line switch
c. Single cycle switch
d. Punch select switch
7) Reset AlB 1 and A2B2 as follows:
a. Ground A 1 B23 G
b. Step through UTR
c. Ground A 1 B23 K
d. Step through U TR
8) Tu~n on Punch Scan Latch - Ground A2 016 F
9) Advance Punch Scan Ring to character position
before the one equal to the digit stored in Punch
Buffer.
10) Remove the SMS card at A2 019 Punch Trans Accu
Latch - Prevents continuous reset of Punch Scan
Ring.
11) Advance Punch Scan Ring as follows:
Ground A2 F16 A (PSRB advance)
Ground A2 F15 A (PSRA advance)
Repeat alternately to advance ring 12-11-0-1-2-
3-4-5-6 then Ground A2 F22 P (PSRB advance P)
A2 F23 E (PSRA advance P)
Transfer to and from 1620 can be accomplished by
turning on CE MAR stop bypass switch. SCE key
can be used to single cycle these transfers when a
Read or Write Op code is add ressed in the 1620.
12) Single cycle UT ring for Buffer to A1Bl transfer-
RB-1 should be on for
~II
positions.
13) Again single cycle UTR ring to check buffer to
AlB 1 transfer - RB-1 light shou Id be out and AlB 1
light on for all positions.
14) Replace A2 019 SMS card in socket.