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**82395SX     Smart Cache                                     12/17/90
***Notes:...
**82396SX     Smart Cache                                     12/17/90...
**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...
**HT18          80386SX Single Chip                            c:Sep91
***Info:
The HT18  is an advanced PC/AT compatible,  single-chip 80386SX design
solution. This  highly integrated single chip allows  simple, low cost
system  design options  while  featuring high  performance, low  power
consumption,  and minimum board  space requirements.   Advanced memory
management features  include support  for page mode,  with 2  or 4-way
interleaving  in both pipelined  and non-pipelined  modes(18A/B only).
Extended Hardware EMS  options include dual sets of  32 registers with
multiple context operation. Revisions A/B support 256K and 1M DRAMs in
1 by 1,  1 by 4, and 1  by 9 device configurations. Rev  C supports 4M
devices, as well.  A Shadow RAM  option for System Video BIOS and dual
or single system ROM BIOS support adds to overall design versatility.

A  complete PC/AT  compatible  system with  advanced  features may  be
implemented with minimal external support logic. The HT18 performs all
CPU  and peripheral support  functions in  a single  chip.  Integrated
device  functions include  DMA Controllers,  a Memory  Mapper, Timers,
Counters, Interrupt  Controllers, a Bus Controller  and all supporting
circuitry for PC core logic requirements. An asynchronous AT Bus clock
allows  for a  constant 8MHz  Bus clock  rate for  highest  bus device
compatibility as defined in IEEE Spec P996. This device is packaged in
a 208-pin  Plastic Quad Flat  Pack combining several  external buffers
into this space saving solution.

***Configurations:...
***Features:...
**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...
*Symphony...
*TI (Texas Instruments)...
*UMC...
*Unresearched:...
*VIA...
**VT82C586/A/B PCI Integrated Peripheral Controller          <10/13/96
***Info:...
***Versions:...
***Features:
o   PC97 Compliant PCI to ISA Bridge
    - Integrated ISA Bus Controller with integrated DMA, timer, and 
      interrupt controller
    - Integrated keyboard controller with PS2 mouse support
    - 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, 2MB EPROM and combined BIOS support
    - Programmable ISA bus clock
o   Inter-operable with Intel and other Host-to-PCI Bridges
    - Combine with VT82C595 for a complete Pentium / PCI / ISA system 
      (Apollo VP2)
    - Combine with VT82C685/687 for a complete Pentium-Pro /PCI / ISA 
      system (Apollo P6)
    - Inter-operable with other Intel or non-Intel Host-to-PCI bridges 
      for a complete PC97 compliant PCI/ISA system
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 22MB/sec to cover PIO mode 4 and multi-word 
      DMA mode 2 drives and beyond
    - Extension to UltraDMA-33 / ATA-33 interface for up to 33MB/sec 
      transfer rate
    - Sixteen levels (doublewords) of prefetch and write buffers
    - Interlaced commands between two channels
    - Bus master programming interface for SFF-8038i 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 (doublewords) data FIFO with full scatter and 
      gather capability
    - Root hub and two function ports with integrated physical layer 
      transceivers
    - Legacy keyboard and PS/2 mouse support
o   Sophisticated Power Management
    - Normal, doze, sleep, suspend and conserve modes
    - System event monitoring with two event classes
    - One idle timer, one peripheral timer and one general purpose 
      timer
    - More than ten general purpose input and output ports
    - Seven external event input ports with programmable SMI condition
    - Complete leakage control when external component is in power off 
      state
    - Primary and secondary interrupt differentiation for individual 
      channels
    - Clock stretching, clock throttling and clock stop control
    - Multiple internal and external SMI sources for flexible power 
      management models
    - APM 1.2 compliant
    - Pin-compatible upgrade to VT82C586B for OnNow / ACPI (Advanced 
      Configuration and Power Interface) power-management support, 
      256-byte extended CMOS, Distributed DMA, and I2C capabilities
o   Plug and Play Controller
    - PCI interrupts steerable to any interrupt channel
    - Dual interrupt and DMA channel controllers for on-board plug and 
      play devices
    - Microsoft Windows 95 and plug and play BIOS compliant
o   Built-in Nand-tree pin scan test capability
o   0.5um mixed voltage, high speed and low power CMOS process
o   Single chip 208 pin PQFP

**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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