IBM 1620 - IBM 1443 Printer Overview; 1443 Printer Keys, Lights, and Switches

Plinch Check Lig ht . The punch check li g ht is turncd
on wh n there is an un qual comparison be tw ecn the
data punch ed and the data r ea d (one card f ed cycle
l ater , at the check station), or wh en a 1622 parit y error
occurs
during punching (se lect stop switch set to STOP).
Th e ma hine stops, and r ady status is terminated.
Chip Li gl!t. Th chip li g ht is turned on to indicate
that the chip box should be emptied.
1620 Con so le Writ e Ch eck Li ght. Th e 1620 writ
check ( 07 ) indicator and consol Ii ht ar turn d on
by a
parit y ITor durin g a core to rag to huffer stor ag
transfe r. Th 07 indicator ma y be pr ogrammed to trans-
fer
dat a several times and to halt if a corr ct tr ansfer
cannot be ohtain ed.
1620 Con ole Pllnch 0 Feed Li ght. Th e co nsok
punch no f ee d light is turned on eac h timc thc pun ch
is selccted
by a writ e co mmand . Th c li g ht remains on
until the
pun ch unit is r ea dy and exec ut es the com-
mand . 10rmal\y, no li g ht is seen if co mmand s arc
further apart than 480 millisccond s. Th e write com-
mand cann ot b xecuted until the pun ch is in rea d:- ,
status.
C HO H EADEn / P :\'C H LIG HT S
Th e stacker, h'an port , fuse, and th rma lli ghts ar c used
commonly b both the I' ad and punch fceds as fol\ows:
Stacker Li ght. Th e stacker li g ht is turned on when
a stac ker is full. Both feeds ar s topp ed tc mp orarily a nd
I' moved from re ad statu. Th r ea dy li g ht remains on.
Op ration resumes automatica ll y after the stacker is
mptied.
Transport Li g ht . Th e transport li g ht is turn ed on
when a card jam has occurred in either th read or
punch feed or above any tacke r. \\ h n this occur s,
Figure 9. 113~1 1620 Console
both f d are sto pp ed and r moved from r ad statu s.
Both sta rt keys must be pr ess d to resume operation
after th condition is corr ted.
Fli se Light. Th e fuse li g ht turns on to indicate a
hl own fus .
Th ermal Li g ht . Th e th rmalli g ht is turn ed on if the
int ernal t mp er atur of the 1622 becomes excessiv .
Aft
I' several minut es delay, th 1620 onsole I' set key
may b PI' sed to turn off th thermal li ght. 1£ pr ess-
ing the r s t k Y turns off the th rmal li ght. the 1620
power s wit ch must be turn d off and th n on aga in.
Op ration may be r Slimed after the power ready li ght
is tllrn ed on.
Console
Th e consol ( Figur 9) is an int eg ral part of the cen-
tral pr ocessing unit a nd pro id s for manual or auto -
matic control of the system. Th e con. ole li ghts, keys,
switch s, a nd t:'p ew ritcr are used to:
In
st ruct th ma chine manua ll y.
Dis pla:- ' m ac hine and program status indi ator s.
Di splay the co nt e nt s of core storage and r eg iste rs .
Place data and instructions in core storage.
A Iter the co nt e nt · of core storag e.
Alter machine function s.
Keys, Indicator Displays, and Switches
ma ll inca nd sce nt li g ht s arc used to I' pr ese nt the on
and off conditions of i~t e rnal check in li cator s.
Seven console switche. (four program and three ma-
chin check switche ) are prO Vided to extcrna lJ:- , 'o n-
trol the xecution of machine func ti ons for which two
App endix B 91