Xerox 7120 - Xerox 530 and Sigma

XEROX 530 AND SIGMA 2/3 PROGRAMMING EXAMPLE
The following coding sequence illustrates a card reader routine for use with Xerox 530 and Sigma 2/3 computers.
The routine performs a read operation and returns to the main program. The ca II ing sequence is:
Label
P
L
X
A
READ
ERROR
RETURN
ORDERLOC
IOCDI
IOCD2
LDX
LDA
RCPYI
BUFFER
ORDER
P, L
B READ
RETURN LOCATION
Command
EQU
EQU
EQU
EQU
STA
RCPY
STA
LDA
WD
LDA
WD
LDA
SIO
TIO
BNC
B
RD
BAN
RD
AND
BAZ
RCPY
RCPY
RES
RES
DATA
LPOOL
Argument
2
4
7
ORDERLOC
X,A
IOCDI
=ORDERLOC
X'E'
=X'4001'
X'F'
=3
$+2
$-2
X'F'
ERROR
X'E'
=X'8800'
RETURN
*O,A
L, P
120
X = Address of input buffer
A = Card reader order code
Comments
Defi ne P reg i ster.
Define L register.
Define X register.
Defi ne A regi ster.
Store order code.
Store buffer address.
Load address of order into
even-numbered channel register.
Odd-numbered channel register.
Set to data chain with byte count = 1.
Device number of card reader.
Start input.
Test input.
Branch if input complete.
Branch if input not complete.
Check for val idity error.
Branch if validity error.
Check for transmission error
or unusual end.
Branch if no error or unusual end.
Set A register to -1 {error code}.
Return to main program.
Set to A register val ue on entry.
Set to X register value on entry.
Byte count {no data chaining}.
Allocate literals.
Appendix B 23
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