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**82495DX/490DX DX CPU-Cache Chip Set                           <Sep91
***Notes:...
***Info:...
***Configurations:...
***Features:...
**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...
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*OPTi...
**82C546/547     Python PTM3V                                     c:94
***Notes:...
***Info:
The  OPTi Python  Chipset provides  a highly  integrated  solution for
fully  compatible, high-performance  PC/AT  platforms. Together,  with
OPTi's  82C206 Integrated  Peripheral Controller  (IPC),  this chipset
will  support the  Pentium processor  in the  most cost  effective and
feature-rich designs available  today. This highly integrated approach
provides  the  foundation  for   a  cost  effective  platform  without
compromising performance. The OPTi  Python Chipset supplies a powerful
solution  positioned  to  deliver  value without  neglecting  quality,
compatibility, or reliability.

The  Python Chipset  is  comprised  of two  chips,  the 82C547  System
Controller (SYSC) and  the 82C546 AT Bus Controller  (ATC). A complete
Pentium  processor solution  consists of  the Python  Chipset  and the
82C206 Integrated Peripheral Controller (IPC).

82C546 (ATC) AT Bus Controller
The 82C546  ATC integrates the AT  bus interface and  data buffers for
transfers between the  CPU data bus, local data bus  and the DRAM data
bus. It also provides the ISA to local bus command translation.

o 208-pin PQFP
o Data bus buffer (host data to memory data)
o Data bus buffer control (ISA to memory)
o Parity generation and detection circuitry
o Keyboard controller chip select
o Local bus interface (ISA to local bus command translation)

82C547 (SYSC) System Controller
The  82C547 SYSC  provides  the  control functions  for  the host  CPU
interface, the  32-bit local  bus interface, the  64-bit Level  2 (12)
cache and  the 64-bit DRAM bus.  The SYSC also controls  the data flow
between the CPU bus, the DRAM bus, the local bus, and the 8/16-bit ISA
bus.

o 160-pin PQFP
o Pentium CPU interface
o DRAM controller
o L2 cache controller
o Ll cache controller
o Local bus interface
o Reset generation
o Arbitration logic
o Data bus buffer control (memory data to/from host data)
o Extended DMA page register
o Keyboard emulation of A20M# and CPU warm reset
o Port B and Port 92h Register

82C206 (IPC) Integrated Peripherals Controller
The 82C206  IPC provides two  DMA controllers, two  interrupt control-
lers, one timer/counter, and a real-time clock in an industry standard
single-chip  solution  for  the  peripherals  attached  to  the  PC/AT
peripheral bus.

o 84-pin PLCC or 100-pin PQFP
o Supports four DMA transfer modes
o Special Commands provided for ease of programming

Support Chips
The  82C606A and 82C606B  are two  buffer/translation devices  used to
translate  3.3V signals to  5.0V signal  levels in  Python motherboard
solutions. These devices buffer the CPU  address bus to the ISA and VL
address buses, the  82C546 ATC's memory data bus to  the ISA data bus,
the peripheral  XD bus  to the ISA  SA and  SD buses. The  82C606A and
82C606B integrate  a number of  glue logic TTL  devices (approximately
eleven), hence  reducing the  amount of TTL  on the  motherboard.  The
82C606A  and 82C606B  devices are  actually the  same device  with two
strapping options. Pulling the CONFI/2#  pin high causes the device to
function in the 82C606A Mode.  Pulling the CONFII2# pin low configures
the device to function in the 82C606B Mode of operation.

o 100-pin PQFP
o Mixed voltage to support 3.3V to 5.0V signal translation
o Two devices replace approximately eleven TTL devices

***Configurations:...
***Features:...
**82C556/7/8     Viper [no datasheet]                                ?...
**82C556/7/8N    Viper-N  Viper Notebook Chipset             <05/25/95...
**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...
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