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**A note on VESA support of 486 chipsets.
Many chipsets state  that they support VESA local  bus.  In some cases
these actually  implement VLB somewhat  like PCI, where it  is entirly
decoupled from the CPU bus. Chipsets  that do not state they work with
VLB,  may  be found  on  motherboards  that  contain VLB  slots.   VLB
is  *basically*  The 486  CPU  pinout in  a  slot  form. Unless  these
m/boards contain  some additional  chips, there VLB  implementation is
directly coupled to the CPU.

**Datasheets:...
*_IBM...
*ACC Micro...
*ALD...
*ALi...
*AMD . . . . . . . [no datasheets, some info]...
*Chips & Technologies...
*Contaq  . . . . . [no datasheets, some info]...
*Efar Microsystems [no datasheets, some info]...
*ETEQ...
*Faraday...
*Forex . . . . . . [List only, no datasheets found]...
*Intel...
**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...
*HMC (Hulon Microelectronics)...
*Logicstar...
*Motorola...
*OPTi...
*PC CHIPS/Amptron/Atrend/ECS/Elpina/etc...
*SIS...
**5571           (Trinity) Pentium PCI/ISA Chipset (75MHz)   <12/09/96
***Info:...
***Configurations:...
***Features:...
**5581/5582      (Jessie)  Pentium PCI/ISA Chipset (75MHz)   <04/15/97
***Info:...
***Configuration:...
***Features:
o   Support Intel Pentium CPU and other compatible CPU host bus at 
    50/55/60/66/75 MHz
o   Support CPU with MMX feature
o   Support the Pipelined Address Mode of Pentium CPU
o   Support the Full 64-bit Pentium Processor data Bus
o   Meet PC97 Requirements
o   Integrated Second Level (L2) Cache Controller
    - Write Back Cache Modes
    - 8 bits or 7 bits Tag with Direct Mapped Cache Organization
    - Integrated 16K bits Dirty RAM
    - Support Pipelined Burst SRAM
    - Support 256 KBytes and 512 KBytes Cache Sizes
    - Cache Hit Read/Write Cycle of 3-1-1-1
    - Cache Back-to-Back Read/Write Cycle of 3-1-1-1-1-1-1-1
o   Integrated DRAM Controller
    - Support 6 RAS Line (3 Banks) of FPM/EDO/SDRAM DIMMs/SIMMs
    - Support 2Mbytes to 384Mbytes of main memory
    - Support Cacheable DRAM Sizes up to 128 MBytes.
    - Support 256K/512K/1M/2M/4M/8M/16M/32M x N FPM/EDO/SDRAM DRAM
    - Support 64 Mb DRAM Technology
    - Support 3.3V or 5V DRAM.
    - Supports Symmetrical and Asymmetrical DRAM.
    - Support 32 bits/64 bits mixed mode configuration
    - Support Concurrent Write Back
    - Support CAS before RAS Refresh
    - Support Relocation of System Management Memory
    - Programmable CAS#, RAS#, RAMWE# and MA Driving Current.
    - Fully Configurable for the Characteristic of Shadow RAM (640 
      KBytes to 1 MBytes)
    - Support FPM DRAM 5-3-3-3(-3-3-3-3) Burst Read Cycles
    - Support EDO DRAM 5-2-2-2(-2-2-2-2) Burst Read Cycles
    - Support SDRAM 6-1-1-1(-2-1-1-1) Burst Read Cycles
    - Support X-1-1-1/X-2-2-2/X-3-3-3 Burst Write Cycles
    - Support 8 Qword Deep Buffer for Read/Write Reordering, Dword 
      Merging and 3/2-1-1-1 Post write Cycles
    - Two Programmable Non-Cacheable Regions
    - Option to Disable Local Memory in Non-Cacheable Regions
    - Shadow RAM in Increments of 16 KBytes
o   Integrated PMU Controller
    - Meet ACPI Requirements
    - Support Both ACPI and Legacy PMU
    - Support Suspend to Disk
    - Support SMM Mode of CPU
    - Support CPU Stop Clock
    - Support Power Button for ACPI function
    - Support Automatic Power Control for system power off function
    - Support Modem Ring-in, RTC Alarm Wake up
    - Support Thermal Detection
    - Support GPIOs, and GPOs for External Devices Control
    - Support Programmable Chip Select
o   Provides High Performance PCI Arbiter.
    - Support up to 5 PCI Masters
    - Support Rotating Priority Mechanism
    - Hidden Arbitration Scheme Minimizes Arbitration Overhead.
    - Support Concurrency between CPU to Memory and PCI to PCI
o   Integrated Host-to-PCI Bridge
    - Support Asynchronous and Synchronous PCI Clock
    - Translates the CPU Cycles into the PCI Bus Cycles
    - Provides CPU-to-PCI Read Assembly and Write Disassembly 
      Mechanism
    - Translates Sequential CPU-to-PCI Memory Write Cycles into PCI 
      Burst Cycles
    - Zero Wait State Burst Cycles
    - Support IDE Posted Write
    - Support Pipelined Process in CPU-to-PCI Access
    - Support Advance Snooping for PCI Master Bursting
    - Maximum PCI Burst Transfer from 256 Bytes to 4 KBytes
o   Integrated Posted Write Buffers and Read Prefetch Buffers to 
    Increase System Performance
    - CPU-to-Memory Posted Write Buffer (CTMFF) with 8 QW Deep, 
      Always Sustains 0 Wait Performance on CPU-to-Memory.
    - CPU-to-Memory Read Buffer with 4 QW Deep
    - CPU-to-PCI Posted Write Buffer(CTPFF) with 8 DW Deep
    - PCI-to-Memory Posted Write Buffer(PTHFF) with 8 QW Deep, 
      Always Streams 0 Wait Performance on PCI-to/from-Memory Access
    - PCI-to-Memory Read Prefetch Buffer(CTPFF) with 8 QW Deep
o   Integrated PCI-to-ISA Bridge
    - Translates PCI Bus Cycles into ISA Bus Cycles
    - Translates ISA Master or DMA Cycles into PCI Bus Cycles
    - Provides a Dword Post Buffer for PCI to ISA Memory cycles
    - Two 32 bit Prefetch/Post Buffers Enhance the DMA and ISA Master 
      Performance
    - Fully Compliant to PCI 2.1
o   Enhanced DMA Functions
    - 8-, 16- bit DMA Data Transfer
    - ISA compatible, and Fast Type F DMA Cycles
    - Two 8237A Compatible DMA Controllers with Seven Independent 
      Programmable Channels
    - Provides the Readability of the two 8237 Associated Registers
    - Support Distributed DMA
o   Built-in Two 8259A Interrupt Controllers
    - 14 Independently Programmable Channels for Level- or Edge-
      triggered Interrupts
    - Provides the Readability of the two 8259A Associated Registers
    - Support Serial IRQ
o   Three Programmable 16-bit Counters compatible with 8254
    - System Timer Interrupt
    - Generates Refresh Request
    - Speaker Tone Output
    - Provides the Readability of the 8254 Associated Registers
o   Built-in Keyboard Controller
    - Hardwired Logic Provides Instant Response
    - Support PS/2 Mouse interface
    - Support Hot Key "Wake-up" Function
    - Capable of Enable/Disable Internal KBC and PS2 Mouse
o   Built-in Real Time Clock(RTC) with 256B CMOS SRAM
    - Built-in up to one Month Alarm for ACPI
o   Fast PCI IDE Master/Slave Controller
    - Bus Master Programming Interface for ATA Windows 95 Compliant 
      Controller
    - Support PCI Bus Mastering
    - Plug and Play Compatible
    - Support Scatter and Gather
    - Support Dual Mode Operation - Native Mode and Compatibility 
      Mode
    - Support IDE PIO Timing Mode 0, 1, 2 ,3 and 4
    - Support Multiword DMA Mode 0, 1, 2
    - Support Ultra DMA/33
    - Two Separate IDE Bus
    - Two 16 Dword FIFO for PCI Burst Transfers.
o   Universal Serial Bus Host Controller
    - OpenHCI Host Controller with Root Hub
    - Two USB ports
    - Support Over Current Detection
    - Support Legacy Devices
o   Support I2C serial Bus
o   Support the Reroutibility of the four PCI Interrupts
o   Support 2Mb Flash ROM Interface
o   Support NAND Tree for ball connectivity testing
o   553-Balls BGA Package
o   0.35μm 3.3V Technology   

**5591/5592/5595 (David)   Pentium PCI A.G.P. Chipset        <01/09/98...
**5596/5513      (Genesis) Pentium PCI Chipset               <03/26/96...
**5597/5598      (Jedi)    Pentium PCI/ISA Chipset           <04/15/97...
**530/5595       (Sinbad) Host, PCI, 3D Graphics & Mem. Ctrl.<11/10/98...
**540            (Spartan) Super7 2D/3D Ultra-AGP Single C.S.<11/30/99...
**55x            SoC (System-on-chip)                        <03/14/02...
**
**Support chips:
**85C206     Integrated Peripheral Controller [no datasheet]         ?...
**5595       Pentium PCI System I/O                          <12/24/97...
**950        LPC I/O                                         <07/16/99...
**Other:...
**PII/III/Pro...
**Athlon etc...
*Symphony...
*TI (Texas Instruments)...
*UMC...
*Unresearched:...
*VIA...
**VT82C598MVP  Apollo MVP3,Single-Chip 66/75/83/100MHz & AGP <09/22/97
***Notes:...
***Info:...
***Configurations:...
***Features:...
**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...
*VLSI...
*Western Digital...
*Winbond...
*ZyMOS...
*General Sources:...

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