8642 PC Server 720

84h7085.exe    PC Server 720 reference diskette version 1.12
720pci.exe    720PCI PC Server 720 PCI Configuration Diskette
4227103.exe   PC Server 720 diagnostic diskette version 1.13
4305348.exe   PC Server 720 BIOS flash update level 14 ver 1.10
4305348a.txt   README file for  BIOS flash update level 14 ver 1.10
720svga.exe   PC Server 720 SVGA support diskette version 1.01 (CLMODE) 
720svga.txt   Readme for 720svga.exe 
195-071  IBM PC Server 720 with ServerGuide and Related Options

BIOS 10 and diags 1.12 and later properly reset memory cache after testing.

PCI Bridge Card
CPU Card
Memory Card

720 Planar
Reverse Polarized SMD Capacitor on Video 
Error Codes Corollary Errors, PCI Errors, General Errors
LED Meanings for Planar and Adapters


PC Server 720 Planar (Thanks to Tim Clarke for component IDs)

 
JMP2 Password write-enable
JMP4 power-on features
JMP5 ROM bank select
J?? Serial ports header
J24 PCI bus speed select
J25 remote update (CE use only)
U1 oscillator/clock 14.3181MHz
U2, U3 Cypress CY78991-7JC
U4 100MHz clock for for J4 divisor selection?
U5 DECchip, D7526C, 21050, VY06867
U6 IBM 06H5425 
U7, U8 VRAM chips - NEC 42S4260-70
U9 (EE)PROM 06H7206 Rev. 1
U10 06H3195 
U11 53G0520
U12 Cirrus Logic CL-GD5429-86QC-C
U13 06H2906 		 U14 06H8922
U15 (EE)PROM 75H8834 (BIOS ROM)?
U16 Sony CX581000AM-70 RAM?
U17 (EE)PROM 75H8835 (BIOS ROM)?
U18 75H0154
U19 40.0000MHz oscillator 
U20 Cypress CY78991-7JC
U21, U22 a couple of power transistors
U23 22.184 MHz oscillator 
U24 another power transistor, well-heat-sinked
U25 Dallas DS1230Y-70 NVSRAM
U26 Dallas DS1587 RTC/RAMified
U27 Intel S82078SL
U28 24.0000MHz oscillator 
U29 XILINX XC3042-100 microcontroller?
U30 (Phillips) 07H0560 Rev 1.
0

Tim Clarke has a warning for the faithful:
NOTE: the C7 capacitor on the reverse side of the planar near the video port  is the WRONG WAY ROUND, as with many IBM implementations of the CL-GD54nn video controllers. If you have one of these Server 720s the video output will be dim and will eventually flicker for a fair while and then finally DIE!!! That's happened to this planar and is on-going with the one I replaced this one with. BE WARNED!!!

Reverse Polarized Capacitor on Video
   Just like on the Short 1MB SVGA, there is a reversed capacitor on the planar. This is the original INCORRECT orientation with the positive side of C7 towards the video port.

Error Codes
Corollary Errors (CP,TP,EP,IP,FP,HALT)
PCI Errors  (DDDD DD S 0 VVVV IIII) 
General Errors
 

LEDs - System Board and Adapter 
   LED(s) are located on planar, bridge, processor, and memory card. 
Component  LED On LED Off 
Planar Slot LEDs: B1 (bridge card slot) During / after normal initialization of bridge card  -SW problem preventing initialization of card 
-Defective LED 
-Defective bridge card 
M1 
(memory card slot)		 During initialization of memory card Successful initialization of memory card complete 
M2/P1
(w/ memory card installed)		 During initialization of memory card  Successful initialization of memory card complete 
M2/P1
(w/ processor card installed)		 During initialization and activity on processor card - No activity on processor 
- SW problem preventing initialization of card 
- Defective LED 
- Defective processor card 
P2 thru P6 
(with processor card installed)		 During initialization and activity on  processor card -No activity on processor 
- SW problem preventing initialization of card 
- Defective LED
- Defective processor card 
Micro Channel slots When computer is powered-off  When computer is powered-on 
Bridge card LED During / after normal initialization of bridge card - SW problem preventing initialization of card 
- Defective LED 
- Defective bridge card 
Memory card LED(s) During initialization of memory card Successful initialization of memory card complete 
Processor card LED(s) During initialization and activity on processor card -No activity on processor -SW problem preventing initialization of card 
-Defective LED 
-Defective processor card 


I²C (Inter-Integrated Circuit)
   The I²C (Inter-Integrated Circuit) bus is a serial bus that is used in the PC Server 720 to monitor and control several peripheral functions within the machine. The bus is driven through a VLSI module on the system board. A service processor on the system board (based on the Intel 83C552 micro-controller) controls and monitors these functions within the machine through the I²C bus. These include: 

      The front panel LCD 
      The front panel power controls 
      Detecting the setting of the SCSI ID jumper on the hot-swap backplanes 
      Reading the voltage and temperature sensors on the planar (viewable using NetFinity) 
      Controlling the three fans mounted behind the drive bays 

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