Compaq AlphaServer DS20E Reference Manual page 232

7.23.8 pci_parity
The pci_parity environment variable disables or enables parity
checking on the PCI bus.
Some PCI devices do not implement PCI parity checking, and some have a
parity-generating scheme in which the parity is sometimes incorrect or is not
fully compliant with the PCI specification. A side effect of this behavior is that
superfluous PCI parity errors are reported by the host PCI bridge. In such
cases, the device can be used as long as parity is not checked.
CAUTION: Disabling PCI parity checking on this system is not recommended
or supported.
The syntax is:
set pci_parity value
The options for value are:
on (default)
off
Example
P00>>> show pci_parity
pci parity
7-64 DS20E Reference Guide
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Enables PCI parity checking.
Disables PCI parity checking.
on