Aptiva 2168 Service I Motherboard and Processor Jumpers


Type I2 Board

 

The following is a table of processors andcorresponding jumper settings. Thanks to Richard Esposito and [email protected] for providing this information.

Aptiva 2144/2168 Official Pentium Processor Settings
CPU Speed External Clock J19* Jumper JP2 Multip. Jumper JP3 Jumper JP21 Jumper JP25
INTEL 75MHz 50 MHz   Block 1-3, 2-4 1.5 1-3 1-2 1-2
INTEL 90MHz 60 MHz   Block 1-3, 4-6 1.5 1-3 1-2 1-2
INTEL 100MHz 66.6 MHz   Block 3-5, 4-6 1.5 1-3 1-2 1-2
INTEL 120MHz 60 MHz   Block 1-3, 4-6 2 1-3, 2-4 1-2 Open
INTEL 133MHz 66.6 MHz   Block 3-5, 4-6 2 1-3, 2-4 1-2 Open
INTEL 150MHz 60 MHz   Block 1-3, 4-6 2.5 1-3, 2-4 1-2 2-3
INTEL 166MHz 66.6 MHz   Block 3-5, 4-6  2.5 1-3, 2-4 1-2 2-3
Aptiva M/A Unofficial Pentium Processor Settings
CPU Speed External Clock J19* Jumper JP2 Multip. Jumper JP3 Jumper JP21 Jumper JP25 TESTED ERRORS
INTEL 166Mhz MMX 66.6 MHz   VRM 3-5,4-6 2.5 1-3,2-4 2-3 2-3 YES NONE
INTEL 200MHz 66.6 MHz   Block 3-5,4-6 3 1-3,4-6 1-2 2-3 NO 127?
INTEL 200MHz MMX 66.6 MHz   VRM 3-5, 4-6 3 1-3,4-6 2-3 2-3 YES 127
INTEL 233MHz MMX 66.6 MHz   VRM 3-5,4-6 3.5 1-3,4-6 2-3 1-2 YES 127

Note on Error 127

  1. POST Error 127 is a non-fatal error that says the BIOS does not recognise the configuration and/or processor it has in it. It cannot (so far) be disabled, so it is necessary to manually continue the BOOT sequence AT EVERY BOOT after this error. After that everything will work normally until the next re-BOOT.

Notes on J19

  1. Block is a "Shorting Block" which connects the peripheral and core voltage buses of the Pentium Classic processor together at 3.3V. It is fitted in all A & M series machines, except possibly some early 120MHz ones
  2. VRM drops the 3.3V to 2.8V to feed the core of an MMX class Pentium processor. DO NOT USE A NON-OVERDRIVE MMX WITHOUT IT !!!
  3. The 233MHz processor can require 6.5A at 2.8V. This is beyond the 6A spec. limit for a "normal" VRM (e.g.Semtech for P55C), although probably still OK if it can be kept cool enough.
  4. You can obtain a VRM from "IBM Parts Direct" for about $30, the part number should be 76H3658.

Miscellaneous Notes

  1. Before attempting to go MMX make sure you have the latest BIOS.
  2. I have not personally tested most of this data. Its seems sound on paper, but use it at your own risk
Type I1 Board

Processor Type Settings

| Processor JP23 JP24 JP25 JP38 JP39 JP40
486DX2-66 or 486DX4-100 1-2,3-4 2-3 Open 1-2 Open Open
P24T or P24CT 1-2,3-4 1-2,4-5 1-2,3-4 2-3 3-4,5-6 1-2

Processor Speed Settings

| Processor Speed Jumper JP10 Default Setting
100MHz Open x
66MHz 2-3  
33MHz 1-2  

 





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