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**?????  (Profusion)    c:99
Chips:         
Memory Access Controller (MAC)  
Data Interface Buffer (DIB)
CPUs:          8x P-III Xeon Oct
DRAM Types:    SDRAM PC100 2-way Interleave dual channel
Max Mem:       32GB
ECC/Parity:    ECC
AGP speed:     N/A
Bus Speed:     100
PCI Clock/Bus: 1/3 PCI-66/64



**800 series...
*Headland/G2...
**Notes:
InfoWorld Apr 10, 1989 p42 - Video Severn and G-2 Will Merge to form
Headland Technology.
...affiliate of LSI logic.

According to:
http://www.vgamuseum.info/index.php/news/itemlist/category/15-headland-technology

Graphics chips were renamed from  GC*** to HT***. In this document any
part no. that differs only by  GC/HT have been assumed to be a renamed
part.

**GC101/102     12/16MHz PC/AT Compatible Chip Set             c:Feb88...
**GC101/102/103 12/16MHz PC/AT Compatible Chip Set + EMS 4.0   c:Jul89...
**GCK113        80386 AT Compatible Chip Set                   c:oct89...
**GCK181        Universal PS/2 Chip Set                        c:Mar89...
**HT11          Single 286 AT Chip [no datasheet]               <Aug90...
**HT12/+/A      Single 286 AT Chip with EMS support            c:Aug90...
**HT18          80386SX Single Chip                            c:Sep91...
**HT21          386SX/286 Single Chip (20 MHz)                 c:Aug91...
**HT22          386SX/286 Single Chip (25 MHz)                 c:Sep91...
**HT25          3-volt Core Logic for 386SX                    c:Dec92...
**HT35          Single-Chip Peripheral Controller [partial info]     ?...
**HTK320        386DX Chip Set                                 c:Sep91...
**HTK340        "Shasta" 486 Chip Set                          c:Jun92...
**Support Chips:
**HT44          Secondary Cache                                c:Jun92...
**Other:...
*HMC (Hulon Microelectronics)...
*Logicstar...
*Motorola...
*OPTi...
*PC CHIPS/Amptron/Atrend/ECS/Elpina/etc...
*SIS...
**5581/5582      (Jessie)  Pentium PCI/ISA Chipset (75MHz)   <04/15/97
***Info:
Nowadays, several PC  form factors exist in the  PC board market, such
as  NLX, LPX,  ATX  and Baby-AT  form  factors. Due  to the  different
placements  of the  form factor,  PC chipsets  should be  prepared for
different board  layouts. As a  result, SiS chips based  on compatible
logic design provide two series of chipsets, SiS 5581 and SiS 5582, to
assist board designers for their board layouts.

SiS 5581’s pin assignment is based  on NLX, and LPX form factor, while
SiS 5582’s is defined on the basis of ATX and Baby-AT form factors. In
the next few chapters, you will read "SiS Chip" which indicates either
SiS 5581 or  5582 chipsets, decided by the  placements of form factors
on  PC boards  of customers.   The  SiS Chip  consists of  Host-to-PCI
bridge  function,  PCI  to  ISA  bridge function,  PCI  IDE  function,
Universal Serial Bus host/hub  function, Integrated RTC and Integrated
Keyboard Controller.

SiS Chip  supports Enhanced  Power Management, including  legacy Power
Management  Unit  and   Advanced  Configuration  and  Power  Interface
(ACPI).  It also  supports ATA  Synchronous DMA  transfer  protocol to
improve  the IDE performance  and Common  Architecture for  moving ISA
function to PCI to improve system performance.

***Configuration:
5581  NLX/LPX
5582  AT/ATX

***Features:...
**5591/5592/5595 (David)   Pentium PCI A.G.P. Chipset        <01/09/98...
**5596/5513      (Genesis) Pentium PCI Chipset               <03/26/96...
**5597/5598      (Jedi)    Pentium PCI/ISA Chipset           <04/15/97...
**530/5595       (Sinbad) Host, PCI, 3D Graphics & Mem. Ctrl.<11/10/98...
**540            (Spartan) Super7 2D/3D Ultra-AGP Single C.S.<11/30/99...
**55x            SoC (System-on-chip)                        <03/14/02...
**
**Support chips:
**85C206     Integrated Peripheral Controller [no datasheet]         ?...
**5595       Pentium PCI System I/O                          <12/24/97...
**950        LPC I/O                                         <07/16/99...
**Other:...
**PII/III/Pro...
**Athlon etc...
*Symphony...
*TI (Texas Instruments)...
*UMC...
*Unresearched:...
*VIA...
*VLSI...
*Western Digital...
*Winbond...
*ZyMOS...
*General Sources:...