IBM Selectric

30.3 Figure 30.5
character would be presented to the printer in 67.5
ms (14.8 characters per second), before the printer
is ready to accept it. Since the C5 contacts would
Excessive
Mechanical Delay 16.3 ms still be open part of the new incoming pulse would be
_Magnet-Seal-T-ime------------o6 .5--m~s-------losf .
0
0
to 130
0
46.5 ms
Total of
69.3 ms
This printer, then, would be able to accept the next
character in 69.3 ms or for this one cycle at 14.4
character rate. In an op.:!n ended application, the
31.0 I/o Component Location
Print Selection Magnet Assembly
TAB
B.S.
I
I
I
I
D
U
I I
I
:
I I
I I
I I
I
I
I I
I I
I I
000
000
000
I
I
c
0
0
0
000
000
000
000
I
000
000
000
000
D
@
000
110:
! I
I I
I I
I I
I I
000
000
000
Operational Terminal Block
Space
30.4
2 3 4
S. H.
Dropping characters, malselection, extra cycles can
result
from excessive mechanical delay, depending on
the mechanism affected and the amount of excessive
delay.
5 6 7 8
23 5678
o 0 0 O~O 0 0 0
o 0 0 O~O 0 0 0
000 0 0 0 0 0
o 0 0 o~o 0 0 0
o 0 0 o~o 0 0 0
00000000
Block A
Block B
Selection Contact Terminal Blocks
INDEX
I
n
I I
I I
I I
I
I
I
I I
w
x
I
ro
0
oi
'"
w
£
0
is
00
0
"
Operational Magnet Contacts
10:
I I
I I
I I
: I
I I
C.R.
Operational Magnets
Figure 31.0
4-36