Operator's Consoles - IBM 709 General Information Manual

FIXED POINT OPERATIONS
Operation
709 Ti me and Op/See 7090 Time and Op/See
Add or Subtract 24 usee· 41,660 4.4 usee 227,270
Logical Operations
24 usee 41,660 4.4 usee
227,270
Multiply 190 usee 5,260 25.3 usee
39,640
Divide 240 usee 4,160 30.5 usee 32,780
FLOATING POINT OPERATIONS
Operation 709 Ti me and Op/See 7090 Time and Op/See
Add or Subtract 84 usee 11 ,900 14.0 usee
71,420
Multiply 170 usee 5,880 24.0 usee 41,660
Divide 216 usee
4,620 28.3 usee 35,330
Operations-per-second numbers are approximate.
*usec
=
microseconds
Figure 44. Average Execution Speeds
Figure 45.
IBM
709 Console
22 IBM 709-7090
Operator's Consoles
The 709 operator's console is a physical part of the
central processing unit (Figure 45). It consists of
neon lights, incandescent lamps, keys, and switches.
The contents of the main central processing unit reg-
isters are displayed in neon lights. A 1 is represented
by the light's being on; a 0, by the light's being off.
The 36 entry keys are available to manually insert a
word or words into the central processing unit and
core storage.
The
IBM
7151 Console Control (Figure 46A) is a
separate unit providing centralized control of the 7090
system. It contains indicators, switches, keys, and reg-
ister displays for the operator's use. Channel indica-