JMP1 - Password-override jumper
Battery (coin cell, CR2032)
Password-override jumper (JMP1)
The power-on password locks the keyboard and mouse (if attached
to the mouse port) to help prevent unauthorized use of your server.
If you are using a mouse that is connected to the serial port, the mouse
To erase the power-on password:
The jumper can be left on new position. The password is removed
each time the system is powered-on with the jumper in a new position.
Privileged-access password jumper (JMP2)
Before setting an administrator (also known as privileged-access)
password, it is a good idea to read this section in its entirety.
Using this security feature requires some planning and ongoing administration.
Your server is shipped with the administrator password
feature Disabled. You must move a jumper on the system board before
an administrator password can be set for the first time. The jumper
has two positions:
Warning: If an administrator password is set, then forgotten, it cannot be overridden or removed. The system board must be replaced in order to access the system programs.
The privileged-access password jumper enables setting the privileged-access password. The jumper has two positions, which are marked on the system board. The system is shipped with this jumper in position 1, which prevents the privileged-access password from being set accidentally. To set the password, move the jumper to position 0 then run Set Privileged-Access Password in the system utility programs. (The jumper position has no effect after the password is set.)
Note: See Privileged-Access Password
before attempting to set this password.
Cover Interlock Connector (JMP3)
A 2- by 3-pin connector connects the cover-interlock switches
to the controlling logic on the system board. The two switches are connected
to the tamper-evident logic.
Kickstart Jumper (JMP4)
On the Server 95, serial port A can be used to power-on the system
when the power supply is in the standby mode. The kickstart jumper
controls whether the 'serial data in' or the 'ring indicator' signals from
serial port A are used to trigger the power-on sequence. When the jumper
is in position 0, the 'serial data in' signal is logically connected to
the input to the power supply; when the jumper is in position 1, the 'ring
indicator' signal is the source.
The Kickstart function is embedded in the Dallas DS1585S RTC next to the battery on the 95A planar.
Flash Memory Bank Selector (JMP5)
Remote Maintenance Service Connector (JMP6)
The system board provides a 2-by-2-pin Berg connector for
a remote maintenance or service adapter, such as the IBM PS/2
When the adapter is installed, the system can be turned off or reset from
a remote location.
Note: If you get a 95 that's been stripped, they might have pulled the ServerGuard adapter out, and not jumpered JMP6. So if your new toy refuses to power up, check this jumper.
Adding a Hardware Reset Button
One unfortunate thing about the PS/2 systems is that they lack a hardware reset button. This is especially annoying when you are experimenting with different hardware and software configurations - if the system hangs, and it can't process interrupt requests from the keyboard, you won't be able to use the Control+Alt+Delete combo to reboot the system. The only way to get out of the situation is to power-cycle the entire unit, which isn't ideal. It's slow, as you have to wait for the drives to spun down before you re-power the system, and if you have to repeat the process multiple times, it's not exactly gentle to your hardware...
Pretty much all personal computers can be modified with a hardware reset button, even if they don't have a provision for one by default. This however often requires soldering, wiring modifications, or other actions that may be beyond your comfort zone. (One approach, that should work for pretty much all systems, is to add a normally closed button to the Power Good line that goes from the PSU to the motherboard/planar. This signal is typically wired directly to the reset circuit, and if it disappears, the system restarts...)
On PS/2 systems with the JMP6 - Remote Maintenance Service Connector it's significantly easier, as this pin header conveniently exposes a -RESET input. The "minus" prefix indicates that the signal is "active low" - the "action" happens when it's tied to ground (logic "0"). In this case it means that if we connect pin 3 of JMP6 to ground, the system will restart.
So, all we need is a regular button (ideally one that already has a pair of standalone pin header connectors attached - for example a power button from a random ATX clone) and wire one end to pin 3 of JMP6 and the other to ground. On the 9595A planar you can take ground from pin 1 or 3 of the nearby J103 - Remote Power-ON header. On the 9585 K/N board, you can use pin "0" of the JMP2 - PAP header. Then just hide the button somewhere behind the front bezel, or sacrifice one MCA slot cover and mount the button to it...
3 V lithium coin cell battery (20 mm x 3.2 mm).
Battery Voltage and Life Expectancy
The battery used on the 95XX products has a normal life expectancy of five to seven years. The life of the battery is directly related to how the machine is used. Battery voltage is consumed only when the system is powered off. Since the battery is a lithium battery, it has very long shelf life. For correct machine operation the battery voltage should be between 2.5 volts and 3.7 volts.
Note: Low voltages can corrupt CMOS bits.
To check the battery voltage:
If the battery voltage drops below 2.5 volts, it should be replaced with FRU P/N33F8354 (CR2032). After replacing the battery, the system unit should be powered on and checked for proper operation.