Jumpers and Switches B-9
Table B–4 PCI Board Jumper Descriptions
Jumper Description
➊
J31 1–2: Do not force COM1 DTR
2–3: Force COM1 DTR (default)
This jumper allows you to force DTR. The default position
prevents disconnection of the modem on a power cycle.
➋
J20 1–2: Enable PCI 0 power management events (PME).
2–3: Disable PCI 0 PME (default)
This jumper is reserved.
➌
J21
1–2: Enable PCI 1 PME
2–3: Disable PCI 1 PME (default)
This jumper is reserved.
➍
J13 1–2: Enable VBAT to real-time clock (RTC) chip (default)
2–3: Disable VBAT to RTC chip.
The default setting ties the battery into the real-time clock
(RTC) chip. If you lose time between power cycles or if the
operating system boots with a very inaccurate time, check the
J13 setting. If disabled, set it to enabled. If enabled, the
battery should be changed.
The battery is a 3V 190 milliamp coin cell battery, part
number 12-41476-06.
The RTC chip also stores some environment variable settings.
If you set a bad environment variable such that you cannot
bring up the system, you can disable J13. For example, if you
forgot the password set for AlphaBIOS, set J13 to disabled so
that you can access AlphaBIOS.
NOTE: The operating systems use different algorithms for system time. If you
switch between operating systems(for example, between UNIX and
OpenVMS), be sure to reset the time at the operating system level.
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