Card Reader I/O Instruction Execution Response - Xerox 7120 Reference Manual

Table 5. Card Reader I/O Instructi on Execution Response
Status Bitst
Instruction CCl or 0 CC2 or C Significance
SIO 0
0 I/O address recognized and SIO accepted.
0 1 I/O address recogn ized, but SIO not accepted.
1 0
Selector lOP is IIbus/ ' (appl icable only to Sigma 5/6/7).
1 1 I/O address not recognized.
HIO 0 0
I/O address recognized and card reader IInot busyll when
halt occurred.
0
1 I/O address recognized and card reader IIbusyll when halt
occurred.
1
0 Inval id code.
1 1 I/O address not recognized.
TIO 0 0
I/O address recognized and SIO can currently be accepted.
0
1 I/O address recognized, but SIO cannot currently be accepted.
1 0 Selector lOP is IIbusyll (appl icable only to Sigma 5/6/7).
1
1
I/O address not recognized.
TDY 0 0 I/O address recognized.
0 1 Invalid code.
1
0
Selector lOP is IIbusyll (applicable only to Sigma 5/6/7).
1 1 I/O address not recognized.
AIO 0 0
Normal interrupt condition present (no lIunusual end ll ).
0
1
Unusual interrupt (II unusual end ll ) condition present.
1 0 Inval id code.
1
1 No interrupt condition present.
tIn Xerox 530 and Sigma 2/3 computers, II
011
represents the Overflow bit and IIC" represents the Carry bit; in other
Xerox computers, IICC11I and "CC2" refer to condition code bits.
8 Card Reader Status Response