Xycom XVME-678 Manual page 124

Chapter 5 - XVME BIOS Functions
Returns:
If error: Carry Flag Set
If successful:
AH
=
Error Code
DI
=
"XY"
Carry Flag Clear
AH
=
0
DI
=
"XY"
BX
=
Previous VMEbus master ·configuration
Note:
Bit 0 0
1
Bit 2 0
1
Bit 3-4 00
01
10
11
Bit 5 0
1
- VMEbus master interface disabled
VMEbus master interface enabled
- VMEbus master accesses non-privileged
- VMEbus master accesses supervisory
VMEbus request level 3
VMEbus request level 2
VMEbus request level
1
VMEbus request level 0
- Release VMEbus when done
- Release VMEbus on request
VMEbus Request Level cannot be changed when system resources are enabled. Also VMEbus request
level and VMEbus release settings should only be changed when the VMEbus is owned by the XVME-
678/688 (see sections 5.5.3 through 5.5.6 for VMEbus ownership functions).
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