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**82485       Turbo Cache (and 485Turbocache)                      c90
***Notes:...
***Info:...
***Versions:...
***Features:...
**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...
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*SIS...
**5595       Pentium PCI System I/O                          <12/24/97
***Notes:...
***Info:
SiS5595  is a  highly integrated  system I/O  that constitutes  a high
performance, rich featured, yet glueless solution for both Pentium and
Pentium  II  systems.   

The SiS5595 PCI  system I/O integrates the PCI-to-ISA  bridge with the
DDMA and PC/PCI  DMA, Serial IRQ capability, the  ACPI/Legacy PMU, the
Data  Acquisition   Interface,  the  Universal   Serial  Bus  host/hub
interface,  and the  ISA bus  interface,  which contains  the ISA  bus
controller, the  DMA controllers,  the interrupt controllers,  and the
Timers.  It also integrates the Keyboard controller, and the Real Time
Clock (RTC).  The built-in USB controller, which is fully compliant to
OHCI (Open Host Controller  Interface), provides two USB ports capable
of running full/low speed  USB devices. The Data Acquisition Interface
offers  the  ability of  monitoring  and  reporting the  environmental
condition  of the  PC.  It  could monitor  5  positive analog  voltage
inputs, 2  Fan speed inputs,  and one external temperature  inputs. It
also integrates the automatic power control logic to control the power
ON/OFF for ATX power supply.  In addition, SiS5595 also integrates the
thermal  detection and frequency  ratio control  logic for  Pentium II
CPU.

***Versions:...
***Features:...
**950        LPC I/O                                         <07/16/99...
**Other:...
**PII/III/Pro...
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*VIA...
**VT82C680     Apollo P6, Pentium-Pro Chip Set               <08/30/96
***Notes:...
***Info:...
***Configurations:...
***Features:
o   High Integration
    - VT82C685 system controller
    - VT82C687 data buffer
    - VT82C586 PCI to ISA bridge
    - Six TTLs for a complete main board implementation
o   Flexible CPU Interface
    - 64 bit Pentium-Pro CPU interface
    - CPU external bus speed up to 66 MHz
    - Supports Pentium-Pro CPU multi-phase bus protocol for split 
      transactions
    - Supports four level deep in-order-queue and deferred transaction
    - Supports APIC multiprocessor protocol
    - GTL+TM bus driver and receiver compatible with Intel 
      specification
o   Fast DRAM Controller
    - Sixteen level (quadwords) of CPU to DRAM write buffers
    - Sixteen level (quadwords) of DRAM to CPU read buffers
    - Fast Page Mode/EDO/Burst EDO/Synchronous-DRAM support in a mixed 
      combination
    - Mixed 1M/2M/4M/8M/16MxN DRAMs
    - Supports 2-way bank-interleaving of 16 MB SDRAM
    - Supports 2-way and 4-way bank-interleaving of 64 MB SDRAM
    - 6 banks up to 1 GB DRAMs
    - Flexible row and column addresses
    - Optional bank-by-bank ECC and parity generation, detection, and 
      correction capability
    - ECC with 1 bit error correction and multi-bit error detection 
      capability
    - 3.3v and 5v DRAM without external buffers
    - Burst read and write operation
    - 5-1-1-1-1-1-1-1 back-to-back Burst EDO and Synchronous DRAM 
      transfer at 66 MHz
    - 532 MB/s peak transfer rate for Burst EDO and Synchronous DRAMs 
      at 66 MHz
    - 266 MB/s peak transfer rate for EDO DRAMs at 66 MHz
    - BIOS shadow at 16 kB increment
    - System management memory remapping
    - Decoupled and burst DRAM refresh with staggered RAS timing
    - Programmable refresh rate, CAS-before-RAS refresh and refresh 
      on populated banks only
o   Intelligent PCI Bus Controller
    - 32 bit 3.3/5v PCI interface
    - Synchronous divide-by-two PCI bus interface
    - PCI master snoop ahead and snoop filtering
    - Concurrent PCI master/CPU/IDE operations
    - Synchronous Bus to CPU clock with divide-by-two from the CPU 
      clock
    - Automatic detection of data streaming burst cycles from CPU to 
      the PCI bus
    - Sixteen levels (double-words) of CPU to PCI posted write buffers
    - Byte merging in the write buffers to reduce the number of PCI 
      cycles and to create further PCI bursting possibilities
    - Zero wait state PCI master and slave burst transfer rate
    - PCI to system memory data streaming up to 132 MByte/sec
    - Sixteen levels (double-words) of post write buffers from PCI 
      masters to DRAM
    - Sixteen levels (double-words) of prefetch buffers from DRAM for 
      access by PCI masters
    - Enhanced PCI command optimization (MRL, MRM, MWI, etc.)
    - Complete steerable PCI interrupts
    - Supports CPU write-back forward to PCI master read to minimize 
      PCI read latency
    - Supports CPU write-back merged with PCI master post-write to 
      minimize DRAM utilization
    - Provides transaction timer to fairly arbitrate between PCI 
      masters
    - Supports five PCI masters in addition to PCI-ISA/IDE/USB bridge
    - PCI-2.1 compliant
o   Enhanced Master Mode PCI IDE Controller with Extension to 
    UltraDMA-33
    - Dual channel master mode PCI supporting four Enhanced IDE 
      devices
    - Transfer rate up to 22 MB/sec to cover PIO mode 4 and multi-word 
      DMA mode 2 drives and beyond
    - Extension to UltraDMA-33 interface for up to 33 MB/sec transfer 
      rate
    - Sixteen levels (doublewords) of prefetch and write buffers
    - Interlaced commands between two channels
    - Bus master programming interface for SFF-8038 rev.1.0 and 
      Windows-95 compliant
    - Full scatter and gather capability
    - Support ATAPI compliant devices
    - Support PCI native and ATA compatibility modes
    - Complete software driver support
o   Universal Serial Bus Controller
    - USB v.1.0 and Intel Universal HCI v.1.1 compatible
    - Eighteen level (doubleword) of data FIFOs with full scatter 
      and gather capabilities
    - Root hub and two function ports with integrated physical 
      layer transceivers
    - Legacy keyboard and PS2 mouse support
o   Plug and Play Controller
    - Dual interrupt and DMA signal steering with plug and play 
      control
    - Microsoft Windows 95TM and plug and play BIOS compliant
o   Sophisticated Power Management and OnNow/ACPI Unit
    - Normal, doze, sleep, suspend and conserve modes
    - System event monitoring with two event classes
    - Two general purpose timers
    - Sixteen general purpose output ports
    - Seven external event input ports with programmable SMI condition
    - Primary and secondary interrupt differentiation for individual 
      channels
    - Clock throttling control
    - Multiple internal and external SMI sources for flexible power 
      management models
    - APM 1.2 compliant models
    - Extension to OnNow and ACPI (Advanced Configuration and Power 
      Interface) support
o   PCI to ISA Bridge
    - Integrated 82C206 peripheral controller
    - Integrated keyboard controller with PS2 mouse supports
    - Integrated DS12885 style real time clock with extended 128 Byte 
      CMOS RAM
    - Integrated USB controller with root hub and two function ports
    - Integrated master mode enhanced IDE controller with enhanced 
      PCI bus commands
    - PCI-2.1 compliant with delay transaction
    - Four double-word line buffer between PCI and ISA bus
    - Supports type F DMA transfers
    - Fast reset and Gate A20 operation
    - Edge trigger or level sensitive interrupt
    - Flash EPROM, 2 MB EPROM and combined BIOS support
o   Built-in Nand-tree pin scan test capability
o   0.5um mixed voltage, high speed and low power CMOS process
o   208 pin PQFP for VT82C685
o   208 pin PQFP for VT82C586
o   208 pin PQFP for VT82C687

**Support chips:
**VT82C505     Pentium/486 VL to PCI Bridge                  <05/30/94...
**VT82C586/A/B PCI Integrated Peripheral Controller          <10/13/96...
**VT82C596/A   Mobile PCI Integrated Peripheral Controller   <11/05/97...
**VT82C686A/B  PCI Super-I/O Integrated Peripheral Ctrl.     <02/10/98...
**Later P-Pro/II/III/Celeron...
**Later AMD...
**Other...
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