Disk I/O Program/Cartridge Disk System Actions - Xerox 7250 Reference Manual

DISI V 0 PROGRAM ACTIOIIS
no
Set
"SIO
not accepted-
indicator.
Set Unusual End
indicator.
Set "no I/O address
recognition" indicator.
Set
uSIO
accepted"
indicator.
r---------r
L-__________
~
I
I
,
I
Set
Transmission Data
t-- _ _ _ _ _ _ _
l-,
&ror indicator.
~----------~ I
Set Incorrect Length
indicator.
I
I
,
,
1- - - - -
- - - r
~----------~ I
I
I
I
,
SetChonnel End
1- - - - - - - -
r
lndic;ator.
~----~----~
,
I
I
I
I
I
I
I
I
,
'~
Advance to "busy"
condition.
(
,
U. E. )
\.-
Signal unusvol end
to disk
VO
program
Signol data transmi"ion
error to disk
VO
program
Signal incorrect length
to disk
VO
program
Signol channel end
to disk
VO
program
Return to
"ready" condition
and weit for
next SIO.
CARTRIDGE DISK SYSTEM ACTION
Figure 8. Disk I/O Program/Cartridge Disk System Actions
Additional Programming Considerations 21