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*Intel...
**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...
**800 series...
*Headland/G2...
**HT25          3-volt Core Logic for 386SX                    c:Dec92
***Info:...
***Configurations:...
***Features:...
**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...
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*TI (Texas Instruments)...
*UMC...
*Unresearched:...
*VIA...
**VT82C590     Apollo VP2, VP2/97, Single-Chip Pentium 66MHz <01/10/97
***Info:...
***Configurations:...
***Features:...
**VT82C597/AT  Apollo VP3, Single-Chip for Pentium with AGP  <10/03/97...
**VT82C598MVP  Apollo MVP3,Single-Chip 66/75/83/100MHz & AGP <09/22/97...
**VT8501       Apollo MVP4,Single-Chip 66-100MHz & AGP       <11/04/98...
**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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