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**82320       MCA compatible Chipset           [no datasheet] 04/10/89
***Notes:...
**82340DX     Chip Set (VLSI) (82346/82345/82355)             01/08/90
***Notes:...
***Info:...
***Configurations:...
***Features:...
**82340SX     Chip Set (VLSI) (82343/82344)                   01/25/89...
**82350       EISA Chip Set                                   07/10/89...
**82350DT     EISA Chip Set                                   04/22/91...
**82420TX/ZX  PCIset (for 486) TX (Saturn), ZX (Saturn II)     c:Nov92...
**82420EX     PCIset (for 486) EX (Aries)   (82425EX/82426EX)   <Dec94...
**82430LX     PCIset (Pentium) LX (Mercury) (82433LX/82434LX) 03/22/93...
**82430NX     PCIset (Pentium) NX (Neptune) (82433NX/82434NX)    Mar94...
**82430FX     PCIset (Pentium) FX (Triton I) (82437FX/82438FX)01/31/95...
**82430MX     PCIset (Pentium) MX (Mobile Triton)(82437/438MX)11/01/95...
**82430HX     PCIset (Pentium) HX (Triton II) (82439HX)       02/12/96...
**82430VX     PCIset (Pentium) VX (Triton II) (82437VX/82438) 02/12/96...
**82430TX     PCIset (Pentium) TX (Triton II) (82439TX)       02/17/97...
**82450KX/GX  PCIset (Pentium Pro) KX/GX (Mars/Orion)         11/01/95...
**
**Support Chips:
**82091AA     Advanced Interface Peripheral (AIP)                  c93...
**8289        Bus Arbiter (808x)                                   c79...
**82289       Bus Arbiter for iAPX 286 Processor Family            c83...
**82258       Advanced Direct Memory Access Coprocessor(ADMA) 01/01/84...
**82335       High-Integration Interface Device For 386SX      c:Nov88...
**82360SL     I/O Subsystem                                   10/05/90...
**82370       Integrated System Peripheral (for 82376)         c:Oct88...
**82371FB/SB  PCI ISA IDE Xcelerator 82371FB/82371SB (PIIX/3) 01/31/95...
**82371MX     Mobile PCI I/O IDE Xcelerator (MPIIX)           11/01/95...
**82371AB     PCI-TO-ISA / IDE Xcelerator 82371AB (PIIX4)     02/17/97...
**82374/82375 PCI-EISA Bridge (82374EB/82375EB, 374SB/375SB)   c:Mar93...
**82378       System I/O (SIO) (82378IB and 82378ZB)           c:Mar93...
**82379AB     System I/O-APIC (SIO.A)                           <Dec94...
**82380       32-bit DMA Controller w/ Integrated Peripherals 02/01/87...
**82380FB/AB  PCIset: 82380FB Mobile PCI-to-PCI Bridge(MPCI2) 02/17/97...
**82384       Clock Generator and Reset Interface                  c86...
**82385       32-bit Cache Controller for 80386               09/29/87...
**82385SX     32-bit Cache Controller for 80386SX             01/25/89...
**82395DX     High Performance Smart Cache                    06/18/90...
**82395SX     Smart Cache                                     12/17/90...
**82396SX     Smart Cache                                     12/17/90
***Notes:...
***Info:...
***Versions:...
***Features:...
**82485       Turbo Cache (and 485Turbocache)                      c90...
**82489DX       Advanced Programmable Interrupt Controller    10/12/92...
**82495DX/490DX DX CPU-Cache Chip Set                           <Sep91...
**82495XP/490XP Cache Controller / Cache RAM (for i860)       06/05/91...
**82496/491     Cache Controller / Cache RAM (for P5 Pentium) 03/22/93...
**82497/492   Cache Controller / Cache RAM (for P54 Pentium)    <Nov94...
**82498/493   Cache Controller / Cache RAM (for P54 Pentium)    <Nov94...
**
**Later chipsets (basic spec):
**440 series:...
**450NX  (?)            06/29/98:...
**?????  (Profusion)    c:99...
**800 series...
*Headland/G2...
*HMC (Hulon Microelectronics)...
*Logicstar...
*Motorola...
*OPTi...
**82C556/7/8N    Viper-N  Viper Notebook Chipset             <05/25/95
***Notes:...
***Info:
The OPTi  Viper (820556/557/558N)  Notebook Chipset provides  a highly
integrated  solution  for  fully  compatible, high  performance  PC/AT
platforms based  on Intel's 3.3V Pentium Processor,  Cyrix's M1 Proce-
ssor, and AMD's K5 Processor.  The chipset provides 64-bit core logic,
integrated  PCI and  VL  support, and  Sophisticated power  management
features.  This highly integrated approach supplies the foundation for
a cost effective platform without compromising performance.  Its feat-
ure set  furnishes an array  of control and status  monitoring options
that are accessed through a simple and straightforward interface.  All
major BIOS vendors provide  extensive software hooks that allow system
designers to integrate their own special features with minimal effort.

The Viper Notebook Chipset is comprised of three chips:
o   82C556 Data Buffer Controller (DBC),
o   82C557 System Controller (SYSC),
o   82C558N Integrated Peripherals Controller (IPC)

82C556 Data Buffer Controller (BBC)
The 82C556  DBC performs  the task  of buffering the  CPU to  the DRAM
memory data path. It also performs parity checking.
o   CPU to memory data buffer
o   CPU to local bus buffer
o   Memory to local bus buffer
o   176-pin TQFP or 160-pin PQFP

82C557 System Controller (SYSC)
The  82C557 SYSC  provides  the  control functions  for  the host  CPU
interface, the 64-bit Level-2 (L2)  cache. the 64-bit DRAM bus. the VL
bus interface, and the PCI  interface. The SYSC also controls the data
flow  between the  CPU bus,  the DRAM  bus, the  local buses,  and the
8/16-bit ISA bus.  The SYSC interprets and translates  cycles from the
CPU. PCI bus master. ISA master, and DMA to the host memory, local bus
slave, PCI bus slave, or ISA bus devices.
o   3.3V CPU interface
o   DRAM controller
o   L2 cache controller
o   L1 cache controller
o   PCI interface
o   Arbitration logic
o   Data bus buffer control (memory data bus to and from host data bus)
o   VL bus interface
o   208-pin PQFP or TQFP

82C558N Integrated Peripherals Controller (IPC)
The 820558N  Integrated Peripherals Controller (IPC)  contains the ISA
bus controller and includes  an 820206, RTC interface, DMA controller,
PCI  arbitration logic.  and a  sophisticated system  power management
unit. It also includes buffers and steering control for the 32-bit PCI
interface.
o   ISA bus controller
o   Integrated 82C206 IPC
o   CPU thermal management functions
o   System power management functions
o   PCI local bus interface
o   Keyboard emulation of A20M# and CPU warm reset
o   Port B and Port 92h Register
o   208-pin PQFP or TQFP


***Configurations:...
***Features:...
**82C556M/7M/8E  Viper-N+ Viper Notebook Chipset                  c:96...
**82C566/7/8     Viper-Max Chipset Scalable MultiMedia PC Solution   ?...
**82C571/572     486/Pentium                                      c:93...
**82C576/7/8     Viper Xpress  [no datasheet]                        ?...
**82C576/8/9     Viper XPress+ [no datasheet, some info]     <01/16/97...
**82C596/597     PTMAWB Pentium Adaptive Write-back (Cobra)       c:93...
**82C650/1/2     Discovery (Pentium Pro) [no datasheet]              ?...
**82C681/2/6/7   386/486WB EISA                                   c:92...
**82C683         386/486AWB EISA [no datasheet]                      ?...
**82C693/6/7     Pentium uP Write Back Cache EISA                 c:93...
**82C700         FireStar                                         c:97...
**82C701         FireStar Plus                                    c:97...
**82C750         Vendetta      [no datasheet]                        ?...
**82c801         SCWB2 DX Single Chip Solution                    c:92...
**82C802         SCWB2 PC/AT Single Chip [no datasheet]              ?...
**82C802G/GP     System/Power Management Controller (cached)      c:93...
**82C895         System/Power Management Controller (cached)   c:Sep94...
**82C898         System/Power Management Controller (non-cache)c:Nov94...
**
**Support Chips:
**82C601/2       Buffer Devices                                 <Nov94...
**82C822         PCIB (VLB-to-PCI bridge)                         c:94...
**Other:...
*PC CHIPS/Amptron/Atrend/ECS/Elpina/etc...
*SIS...
*Symphony...
*TI (Texas Instruments)...
*UMC...
*Unresearched:...
*VIA...
*VLSI...
*Western Digital...
*Winbond...
*ZyMOS...
*General Sources:...

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