Card Layout For 25 Print Lines - IBM System/370 145 Manual

read feature is present). There is no limit to the time taken between
print commands.
The card speed when printing o:n a given model of the 3525 with the
Multi-Line Card Print feature is a function of the number of lines
printed and their location. Some sample throughputs are shown below.
Sixty-four characters are printed on each line.
Number of
Lines Printed
1
2
3
4
6
10
25
Line
position
1
1 and 3
11, 12, and 1:3
11, 12, 13,
~ld
14
11 through 16
11 through 20
All
Speed
Pl
100
100
61
61
51
44
24
in Cards per Minute
P2 P3
200 300
200 240
133 150
114 120
89 92
62 63
29 29
A technique called overlapping is used during print operations in
order to increase card throughput.. During printing operations on a card
for all .lines except the last two., the card is successively moved to the
line position at which printing i~; to occur whi.leother cards in the
transport remain motion.less. Printing of the last two, or only two,
lines occurs during the next card feed cycle during which all cards in
the transport move. In order to implement overlapping, the control unit
stores the data for the last two JLines tO'be printed (in buffers in the
control unit) when the last two print commands are issued but does not
move the card or print the lines. Thus, the time that would normally be
taken to position the card and print the last ,two
'line~
is saved.
166168187168189170171
172173174175176171178h~801
LOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOO~OOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOGOOOOOOO
12345'7"W"U"~~"""".~DD~a.n
•••
~~~~a.v
••
~~~aM~.~
••
~~U"~MM9NNM~uaMM.~.n~nnnu~nnnn~
11 11
22
33
44
55
66
77
88
99
12
22
33
44
55
66
71
88
99
n~
~---------------------------------------------,----------------------------------~
Figure 20.30.4. Card layout for 25 print lines
A Guide to the IBM System/370 Mode:L 145
10
11
12
13
14
16
18
17
18
19
20
21
23
24
25
131