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**82489DX       Advanced Programmable Interrupt Controller    10/12/92
***Notes:...
***Info:...
***Versions:...
***Features:...
**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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*Unresearched:...
*VIA...
**VT82C590     Apollo VP2, VP2/97, Single-Chip Pentium 66MHz <01/10/97
***Info:...
***Configurations:...
***Features:
o   PCI/ISA Green PC Ready
    - Supports 3.3V or 5V interface to CPU, system memory, and / or 
      PCI bus
    - Supports CPUs with internal voltages below 3.3V
    - PC-97 compatible using VT82C586B South Bridge with ACPI Power 
      Management
o   High Integration
    - Single chip implementation for 64-bit Pentium-CPU, 64-bit system 
      memory, and 32-bit PCI interface
    - VT82C590 Apollo VP2 Chipset: VT82C595 system controller and 
      VT82C586B PCI to ISA bridge
    - Chipset includes UltraDMA-33 EIDE, USB, and Keyboard / PS2-Mouse 
      Interfaces plus RTC / CMOS on chip
    - Six TTLs for a complete main board implementation
o   Flexible CPU Interface
    - Supports 64-bit Pentium, AMD 5k86 , AMD 6k86 and Cyrix 6x86 CPUs
    - CPU external bus speed up to 66 Mhz (internal 200Mhz and above)
    - Supports CPU internal write-back cache
    - System management interrupt, memory remap and STPCLK mechanism
    - Cyrix 6X86 linear burst support
    - CPU NA# / Address pipeline capability
o   Advanced Cache Controller
    - Direct map write back or write through secondary cache
    - Pipelined burst synchronous SRAM (PBSRAM) cache support (with 
      global write enable feature)
    - Flexible cache size: 0K/256K/512K/1M/2MB
    - 32 byte line size to match the primary cache
    - Integrated 10-bit tag comparator
    - 3-1-1-1 read/write timing for PBSRAM access at 66 Mhz
    - 3-1-1-1-1-1-1-1 back to back read timing for PBSRAM access at 
      66 Mhz
    - Sustained 3 cycle write access for PBSRAM access or CPU to DRAM 
      and PCI bus post write buffers at 66 Mhz
    - Data streaming for simultaneous primary and secondary cache 
      line fill
    - System and video BIOS cacheable and write-protect
    - Programmable cacheable region and cache timing
o   Fast DRAM Controller
    - Fast Page Mode/EDO/Synchronous-DRAM support in a mixed 
      combination
    - Mixed 1M/2M/4M/8M/16MxN DRAMs
    - 6 banks up to 512MB DRAMs
    - Flexible row and column addresses
    - 64-bit or 32-bit data width in arbitrary mixed combination
    - 3.3v and 5v DRAM without external buffers
    - Optional bank-by-bank ECC (single-bit error correction and 
      multi-bit error detection) for DRAM integrity
    - Two-bank interleaving for 16Mbit SDRAM support
    - Two-bank and four bank interleaving for 64Mbit SDRAM support 
      (14 MA lines)
    - Four cache lines (16 quadwords) of CPU/cache to DRAM write 
      buffers
    - Concurrent DRAM writeback
    - Speculative DRAM access
    - Read around write capability for non-stalled CPU read
    - Burst read and write operation
    - 4-2-2-2 on page, 7-2-2-2 start page and 9-2-2-2 off page timing 
      for EDO DRAMs at 50/60 MHz
    - 5-2-2-2 on page, 8-2-2-2 start page and 11-2-2-2 off page timing 
      for EDO DRAMs at 66 MHz
    - 6-1-1-1 on page, 8-1-1-1 start page and 10-1-1-1 off page for 
      SDRAMs at 66 MHz
    - 5-2-2-2-3-1-2-2 back-to-back access for EDO DRAM at 66 MHz
    - 6-1-1-1-3-1-1-1 back-to-back access for SDRAM at 66 MHz
    - BIOS shadow at 16KB increment
    - 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
    - PCI master peer concurrency
    - 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
    - Five 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 132Mbyte/sec
    - Forty-eight 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 L1 write-back forward to PCI master read to minimize 
      PCI read latency
    - Supports L1 write-back merged with PCI master post-write to 
      minimize DRAM utilization
    - Provides transaction timer to fairly arbitrate between PCI 
      masters
    - PCI-2.1 compliant
o   Built-in nand-tree pin scan test capability
o   0.6um mixed voltage, high speed / low power CMOS process
o   328 pin Low-Profile BGA Package

**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...
**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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