Ce Panel Indicators - IBM 2702 Information Manual

Table 2-1. Correlation of Load line Ctl Word Switch
with LCW Segments
Switch
LCW 1
Switch LCW2
Setting
Segment Setting
Segment
Rl A 0-7
Strobe Count 1 R2 A 0-7
LOSC
Strobe Count 2
Term Ctl1
Strobe Count 4
Term Ctl 2
Strobe Count 8
Timeout
Bit Count 1
Command 7
Bit Count 2
Command 6
Bit Count 4
Command 5
Bit Count
8
Command 4
Rl A 8-15 Serial Data Field 0
R2 A 8-15 Receive Control
Serial Data Field 1 Sequence 1
Serial Data Field 2
Sequence 2
Serial Data Field 3
Sequence 4
Serial Data Field 4
Character Sc:r;vice
Serial Data Field 5
Mode 1
Serial Data Field 6
Mode 2
Serial Data Field 7
Mode 4
Rl B 0-7
Equipment Check R2 B 0-7
Lost Data
Bus Out P Check
Data Check
Timeout Cpt
End
Overrun
Unit Check
Command Reject Unit Exception
Intervention Required
Stack
Check 0
Data Buffer 0
Check 1
Data Buffer 1
R1 B 8-15
Check 2 R2 B 8-15
Data Buffer 2
Check 3
Data Buffer 3
Check 4
Data Buffer 4
Check 5
Data Buffer 5
Check 6
Data Buffer 6
Check 7
Data Buffer 7
Not Used
Not Used
Test L1
Test L2
"
Load
The Load switch is used in conjunction with the Single
Cycle switch to load the contents of the bit switches.
With the Load switch depressed, the contents of
the bit switches are loaded (by steps) into the field
referenced by the Load Line Ctl Word and Test-LCW
Address switches when the Single Cycle switch is
depressed.
The Load switch is active only if the CE Test
switch is depressed.
The Load switch is used in conjunction with the
Single Cycle switch and the TSMT CHAR position of
the Load Line Ctl Word switch to transmit the char-
acter determined by the bit switches to the communi-
cations line addressed by the Test- LCW Address
switches.
Inh LCW Mod
When depressed, the Inh LCW Mod switch prevents
any modification to the LCW addressed by the Test-
LCW Address switches.
The Inh LCW Mod switch is active only if the CE
Test switch is depressed.
Multicycle
The Multicycle switch produces repetitive single-cycle
pulses at a rate of approximately 5 cps.
The Multicycle switch must be used with either the
Clock or Test Osc switch.
The Multicycle switch is active only if the CE Test
switch is depressed.
Wrap
When depressed, the Wrap switch automatically
initiates a wrap-around operation when the Single
Cycle switch is depressed.
With the Wrap switch depressed, the LCW trans-
mit and receive address automatically resets when
the Single Cycle switch is depressed.
An active Write command is placed in the LCW
referenced by the Test-LCW Address switches, and
a Read Inhibit command is given to line zero.
The data byte is taken from the bit switches at
character-service time for the addressed line.
Characters assembled on line zero are compared,
in the
I/o
register, with the bit switches; a failure
to cOmpare causes the Wrap Chk indicator to light.
The Wrap switch is active only if the CE Test
switch is depressed.
The wrap operation is concluded by pressing the
Test-LCW Reset switch.
Bit Switches (0/8 through 7/15)
The bit switches are used to select the data byte to
be transmitted in a CE-panel-initiated wrap test or
a transmit-character-mode operation, as selected
by the Load Line Ctl Word or Wrap switch.
The bit switches are also used to load segments
of an LCW or S-line, as. selected with the Load Line
Ctl Word and Test-LCW Address switches.
Bit-switch contents are loaded by the Single Cycle
pushbutton.
CE Panel Indicators
The following indicators operate independently of the
Display Line Ctl Word and Test-LCW Adr switches:
Operation 2-7