Jumpers

JMP1 - Password-override jumper
JMP2 - Privileged-access password jumper
JMP3 - Cover Interlock Connector
JMP4 - Kickstart Jumper
JMP5 - Flash Memory Bank Selector
JMP6 - Remote Maintenance Service Connector

Adding a Hardware Reset Button

Battery (coin cell, CR2032)


Password-override jumper (JMP1)
(On the planar)

   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 remains active.
   After you set a power-on password, Enter password appears each time you turn on the server. Before you can use the server, you must enter the correct password. (The password does not appear on the screen as you type it.) When you enter the correct password, Password accepted appears on the screen, the keyboard and mouse are unlocked, and the system resumes normal operation. If you type the wrong password, Incorrect password appears on the screen and Enter password is again displayed. After three incorrect attempts, you must turn off the server and start again.

To erase the power-on password:

  1. Power-off the system.
  2. Move jumper to other end.
  3. Power-on the system.

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)
(On the planar)

   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.
   The administrator password allows you to control who has access to the system programs. If an administrator password is set, you must enter it to use the system programs in the System Partition on the hard disk or on the Reference Diskette. The administrator password also can be used to override the power-on password. After an administrator password is set, only those who know the password can perform tasks such as:

  • Altering computer settings or features controlled by the system programs
  • Running diagnostic tests
  • Resetting the system after a forced entry (If the server is forced open, a POST error occurs. To clear the error, you must enter the administrator password. Read about the LogicLock.)

   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:

  • The locked state prevents an administrator password from being set, changed, or removed. This is the position set at the factory.
  • The change state allows an administrator password to be set, changed, or removed.

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.
If the password is removed (using the system utility programs), the jumper can be returned to position 1 to prevent the password from being set.

  • To set the privileged-access password to the change state, move the jumper to position 0.
  • To set the privileged-access password to the locked state, move the jumper to position 1.


Cover Interlock Connector (JMP3)
(On the planar)

   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.
   Switch 1 indicates the position of the keylock to the tamper-evident logic, and switch 2 indicates when the covers are off.

Header Pinout

Pin Description Pin Description
1 Reserved 2 Reserved
3 Switch 2 4 Detect keylock position
5 Switch 1 6 Detect covers open


Kickstart Jumper (JMP4)
(On the planar)

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.
Note: This jumper should be set to position 0 for serial connections that do not drive the 'ring indicator' signal, such as lease line and other directly-connected configurations.

  • Leased-line state, move jumper to position 0.
  • Other modems state, move jumper to position 1.

   The Kickstart function is embedded in the Dallas DS1585S RTC next to the battery on the 95A planar.

Header Pinout

Pin Description
1 Serial data in
2 Power on request output
3 Ring indicator


Flash Memory Bank Selector (JMP5)
(On the processor complex - Type 4 only)

See HERE.


Remote Maintenance Service Connector (JMP6)
(On the planar)

   The system board provides a 2-by-2-pin Berg connector for a remote maintenance or service adapter, such as the IBM PS/2 ServerGuard adapter. When the adapter is installed, the system can be turned off or reset from a remote location.
   When this adapter is not connected to this connector, a jumper must be in place that connects pins 1 and 2 together for the system to be powered-on. These two pins provide a signal path to the 'power-on-request' signal to the power supply.

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.

Header Pinout

Pin Description
1 Power on request input
2 Power on request output
3 -Reset
4 Not connected


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...


Battery

3 V lithium coin cell battery (20 mm x 3.2 mm).

Duracell
Eveready
Panasonic Varta Sanyo
Rayovac Maxell Toshiba
AWI
NEDA
Other
DL2032
ECR2032
CR2032
L14
5004LC
EA-2032C

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:

  • Turn off the system unit power.
  • Remove the battery from the battery holder.
  • Check the battery for a voltage of 2.5 - 3.7 V DC

   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.


9595 Main Page