2800 HD  (250-3550)     Math Coprocessor Information    Faxback Doc. # 1847

The math coprocessor for the 2800HD is available from Intel. The chip I.D. 
number is N80c287XLT. The customer can call Intel at 1-800-538-3373 and 
with a touch tone phone, select product information (#2), then select End 
User Information (#2). The representatives can give the name of a local 
dealer where the customer can obtain the coprocessor.                                │

Installation:

1. Turn off the computer and unplug the adapter and all
   peripheral devices.
2. Remove the battery compartment lid.
3. Disconnect and remove the battery from the computer.
4. Pull back the flap that covers the math coprocessor.
5. Orient the math coprocessor as shown in the
   following illustration.

                                               
         ┌────────────────────────Front of Computer────────────────────┐
         │                                                             │
         │ Contrast                                                    │
        ┌┤/                                                            │
        └┤ Brightness                                                  │
        ┌┤/   ┌─┬─┬─┬─┐                                                │
        └┤    │ │ │ │ │                                                │
        ┌┤    │ │ │ │ │\Compartment                                    │
       /└┤    └─┴─┴/┴─┘ Cover                                          │
    Dip  │        /                                          AC Power  │
 Switches│       /                                         Connector\  │
         ├─┬─┬─┬/┬─┬─┬─┬─┬─┬─┬─┬─┬─┬─┬─┬─┬─┬─┬─┬─┬─┬─┬─┬─┬─┬─┬─┬─┬─┬─\─┤ 
         │ ├─┴─/─┴─┤ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │\├┐
  Back-  │ │  ┌──┐ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ ├┘
  Light\┌┤ │  └──┘─┼─┼─┼Math Coprocessor │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │
  Power └┤ ├─┬─┬─┬─┤ │ │Socket │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │
         └─┼─┴─┴─┴─┴┬┼─┴─┴─┴─┴─┴─┴┐Back of Computer└─┼─┼┬┴─┴─┼─┴─┴─┴─┴─┘
           └/───────┘└───/────────┘                 /└─┘└────┘\
         Serial Port  Parallel Port             Keyboard  EGA/CGA Monitor                                  
                                                Connector    Connector        

CAUTION: Once the math coprocessor has been snapped into place, a special 
chip extraction tool is required to remove it.  Be sure that the 
coprocessor's orientation is correct.

6. Press the math coprocessor evenly until it snaps into place.
7. Replace the battery and the lid.
8. Reconnect the peripheral devices.


(jej-05/10/94)