Device Status Response For Sio, Hio, And Tio; Device Status Response For Tdv - Xerox 7260 Reference Manual

Table 5. Device Status Response for SIO, HIO, and TIO
Bit
Position Function Value Meaning
0 Interrupt pending 1 Set if interrupt is pending (issued, but not acknowledged by an AIO
instruction).
1,2
Device condition Describes the current device condition as follows:
00 Device "ready".
01 Device "not operational".
10 Device "unavailable" (reserved by other controller).
11
Device "busy".
3
Mode 1 Always set to automatic mode.
4
Unusual end 1
Set if previous controller operation terminated with "unusual end".
5,6
Control! er condition Describes the current controller condition as follows:
00 Control I er "ready".
01 Control I er "not operational".
10 Not applicable.
11 Controller "busy".
7
Reserved 0 Always zero.
Table 6. Device Status Response for TDV
Bit
Position Function Value Meaning
0 Reserved 0
Always zero.
1 Flaw detection 1
Flaw byte detected during Header Read, Write, Read, or
Check-write.
2 Programming Error 1
Invalid order detected; illegal address (address X'F' used for orders
other than Select Test Mode or Conditional Release Interrupt); in-
valid Seek address; address incremented out of limits while attempt-
ing a Read or Write order; invalid test mode; Seek order received
while arm was in motion; first seven bits of Seek order were not
zero; or incorrect length detected for Seek, Sense, Header Read,
or Header Write order.
3
Write protection 1
Write-protect violation.
4
Parity error (IOP)
1
Order parity error detected; Seek address parity error detected;
even parity received on a terminal order; or IOP detected an
address parity error (channel address parity error).
Ke{ Events
19