PC Server 720
Type 8642

84h7085.exe PC Server 720 reference diskette version 1.12
720pci.exe 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 J4 div. selection?
U5 DECchip, D7526C, 21050, VY06867
U6 IBM 06H5425
U7, U8 VRAM chips - NEC 42S4260-70
U9 ROM 06H7206 Rev. 1 (video)
U10 06H3195
U11 53G0520
U12 Cirrus Logic CL-GD5429-86QC-C
U13 06H2906 
U14 06H8922
U15 ROM 75H8834 (system BIOS?)
U16 Sony CX581000AM-70 RAM?
U17 ROM 75H8835 (system BIOS?)
U18 75H0154
U19 40.0000MHz oscillator
U20 Cypress CY78991-7JC
U21, U22 a couple of power transistors
U23 22.184 MHz oscillator
U24 power transistor, well heatsinked
U25 Dallas DS1230Y-70 NVSRAM
U26 Dallas DS1587 RTC/RAMified
U27 Intel S82078SL
U28 24.0000MHz oscillator
U29 XILINX XC3042-100 FPGA
U30 (Phillips) 07H0560 Rev 1.
0

Reverse Polarized Capacitor on Video

Note: (from Tim) 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-GD542x 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!!!

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.

Content created and/or collected by:
Louis Ohland, Peter Wendt, William Walsh, David Beem, Tatsuo Sunagawa, Jim Shorney, Tim Clarke, Kevin Bowling, Tomáš Slavotínek, and many others.

Ardent Tool of Capitalism - MAD Edition! is maintained by Tomáš Slavotínek.
Last update: 23 Oct 2021 - Changes & Credits | Legal Info & Contact