PRINTING MULTIPLE LINES of information from the out-put track may be accomplished by proper wiring of the
MLP unit. The number of lines to be printed are con-trolled by an MLP code, which may be placed in any convenient output track position as long as that position remains consistent.
To prepare an invoice heading (Figure 98) the output track is normally assembled in several different steps.
After it is assembled, a print instruction is initiated. Dur-ing the analysis portion of the print cycle, the MLP code is analyzed and controls are set for the printing of from one to four lines. The number of lines to be printed is
determined by the code. For example, a 1 code may cause one line to print; a 2 may cause two lines to print; a 3 may cause three lines to print, etc.
r
ST.-MLPI-o I 0--0----0 M 0 2 0--0----0 L P 0 3 0--0----0
I 0 ",-0--0----0
S-V,9-12
MLP. The MLP unit controls the printing of multiple lines from a single output track. The START hub is im-pulsed from an ANALYZER EXIT. Then, the MLP im-pulse, (MLP I) hubs emit an impulse which may be wired to pick up line program selectors.
The impulse wired to the START hub will usually correspond to the desired number of lines of printing;
that is, a 1 will initiate a single line of printing, a 2
811 IP 8Q III
0 4 0 0
05,0 6 0
o 0 oNe o 0 0 0 oNo
- 15 - - - PRINT POSITION EXITS - 25 -- -- -- -- -- 1 5 -- -- -- OUTPUT TRACK---25
55
9 . -o
o~-o-o----,---o 0 0 0 0 0 0 2 0
o 0 3 0 0
o 0 4 0 0
o 0 0 0 0 0 0 5 0 0 o oNo
o oCo 0 0 0 0 0 0 0 0 oCo 0
_ _ _ _ . . -;;-;--;::;:!55:"-;-;--=-;-:':PRlN~ ~SITl~ ~XIT~--o-~-o - - - -
q;':IIII"""""----o ~
Figure 99. Multiple Line Printing
370 PRINTER 121
for two lines, a 3 for three lines, etc. This type of cod-ing is convenient; however, it is not imperative. For example, a 7 could cause two lines of printing.
Once the START hub has been impulsed the MLP I hubs will emit in sequence. If the THREE START hub is impulsed, the number one MLP I hub will emit on the first line; then the two hub on the second line; and last, the three hub on the third line. If the number TWO START hub is impulsed, the number one and two MLP I hubs will emit in sequence.
Figure 99 shows the wiring necessary to prepare the three-line invoice heading shown in Figure 98. In this example, it is assumed that all invoice headings
3. ZERO SUPPRESSION START is impulsed from PRINT CONTROL EXIT 52 so that it will be on for customer 2. Printing is stopped before printing position 27 by wiring from PRINT CONTROL EXIT 27 to 50, and then through the line program selectors to PRINT STOP (wires 8 and 9).
6. Printing of invoice number begins with print posi-tion 53 (wire 3).
2. In this example it is assumed that all invoice head-ings contain three lines. Therefore, it is only necessary will be skipped to the position corresponding to channel 2 of the tape (wire 15) .
5. Selector 3 is picked up to expand the third line of printing (wire 16) .
LINE PROGRAM SELECTION
1. On the first line of printing, PRINT POSITION EXITS 3-26 are wired through the first line of the line the third line, an output track position is not wired from print position exit 26, PRINT SPACE must be wired (wire 18) .
3. Customer number is directed to print through line one of the line program selectors (wiring 18) .
4. Date is directed through selector 3 to print on the third line of MLP (wire 19).
5. Invoice number is directed to print through line three of the line program selectors (wire 20).
fEjl
w-x,
9-12Line Program Impulse. This impulse is available during the analysis portion of the print cycle. It is, however, inactive if MLP START has been previously impulsed.
3 • ~ I 12 13 14 15 US 17 '8 19 20 21 22 23 24 2~ 26 27 28 29 30 31 l2 33 34 35 3& 37 38 39 40
PRINT Sf'toCE
I
~=
0', -0 - O - - - , - - - B - LINE PROGRA" SELECTORS-C O n
o 0 t o 0 0 0 0 1 0 a 0 0 01°00 a 0 ' 0 0 0 0 a
0 2 0 0 0 2 0
,r---:....---....;.---1. Selector 1 picked up on a digit 1 {early impulse}. 0 0 0
0 ' 0 0 0 4 0 , 2. Anolyzer exit impulse 3 {late impulse} wired 0 0 0
through selector 1 to pick up selector 2. 0 0 0
.s 0 0 0 0 0 0 0 0 C 0 3. Line program impulse which originates after both the , 0 0 0
r~-o. -o-o-~--o-o '~--o-o-'~-o-. early and late analyzer exit impulses may be wired - , 0 - 0 ~
~ ! ! ! ! ! ! ! ! n ! iTrj'iT!wri'i'itij~i"i'! ! ! nn
.. i! ! ! !1 ! ! ! !l ! ! ! 11 ! I ! 11m]
: i! ! ! Ii ! ! ! !1T!-j Ii !
: I
::=11
Figure 100. Series IF'irillg to Illustrate Timillgs
During an MLP operation, the MLP IMPULSE hubs emit, and the LINE PROGRAM IMPULSE hubs are in-active.
The LINE PROGRAM IMPULSE occurs after the C and D ANALYZER EXIT impulses. This arrangement allows the type of selector wiring shown in Figure 100.
TIMING CHART
THE PURPOSE of the printer timing chart (Figure 101) is to increase the general knowledge of the machine op-eration, and to assist experienced programmers who must resort to unusual wiring methods to accomplish a desired result. A good working knowledge of the ma-chine is necessary before timing charts can be used ef-fectively. The timing chart should be used in conjunc-tion with the Control Panel Entry Summary.
All impulses shown on the timing chart with the
ex-ception of the PRINT CONTROL EXITS and PRINT POSI-TION EXITS happen only once during the over-all print cycle. These impulses which happen only once occur dur-ing the analysis portion of the cycle. The analysis portion of the print cycle is completed at 19.5. The first char-acter prints at 21. 5. At 32 on the index, the print shaft latches; however, the PRINT CONTROL EXITS and the PRINT POSITION EXITS continue to emit until all 80 char-acters have been printed or until LINE END on the printer control panel is impulsed.
The timing chart represents intervals of 10 millisec-onds. This timing relationship may be used as a guide for picking up selectors or directing impulses through the transferred points of the selectors. In general, once a selector has been picked up, seven milliseconds should be allowed before directing an impulse through the trans-ferred points of the selector. Impulses that are active dur-ing pickup time should not be selected.
370 PRINTER 123
Control Pone I Hubs
Figure 101. 370 Printer Timing Chart
CONTROL PANEL HUBS
Accepts any low level impulse.
Wire from any print control exit.
Accepts any low level impulse.
Transfer immediately; drop out with line end.
Will accept only line space 1, 2, or 3.
Wire from any print control exit.
Wire from ACI or print position exit only.
Wire from any print position exit.
Wire from any print control exit.
Wire from any print control exit.
Accepts any low level impulse.
Transfer immediately; drop out with line end.
Accepts any low level impulse.
Wire from any print control exit.
Wire from any print control exit.
Wire from any print control exit.
Wire from any print control exit.