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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...
**82371MX     Mobile PCI I/O IDE Xcelerator (MPIIX)           11/01/95
***Notes:...
***Info:...
***Versions:...
***Features:
o   Provides a Bridge Between the PCI Bus and Extended I/O Bus
    - PCI Bus; 25-33 MHz
    - Extended I/O Bus; 7.5-8.33 MHz
o   System Power Management (Intel SMM Support)
    - Programmable System Management Interrupt (SMI)-Hardware/Software
      Events, EXTSMI#
    - Programmable CPU Clock Control (STPCLK#) with Auto Clock 
      Throttle
    - Peripheral Device Power Management (Local Standby)
    - Suspend State Support (Suspend-to-DRAM and Suspend-to-Disk)
o   Enhanced DMA Functions
    - Two 8237 DMA Controllers
    - Fast Type F DMA
    - Compatible DMA Transfers
    - PC/PCI DMA Expansion for Docking Support
o   Fast IDE Interface
    - PIO Mode 4 Transfers
    - 2x16-Bit Posted Write Butter and 1x32-Bit Read Prefetch Buffer
o   Plug-n-Play Port for Motherboard Devices
    - 3 Steerable DMA Channels
    - 1 Steerable Interrupt Lane (Plus 2 Steerable PCI Interrupts)
    - 1 Programmable Chip Select
o   Functionality of One 82C54 Timer
    - System Timer
    - Refresh Request
    - Speaker Tone Output
o   Functionality of Two 82C59 Interrupt Controllers
    - 14 Interrupts Supported
    - Independently Programmable for Edge/Level Sensitivity
o   X-Bus Peripheral Support
    - Chip Select Decode
    - Controls Lower X-Bus Data Byte Transceiver
o   Non-Maskable Interrupts (NMI)
    - PCI System Error Reporting
o   NAND Tree for Board-Level ATE Testing
o   176-Pin TOFP

**82371AB     PCI-TO-ISA / IDE Xcelerator 82371AB (PIIX4)     02/17/97...
**82374/82375 PCI-EISA Bridge (82374EB/82375EB, 374SB/375SB)   c:Mar93...
**82378       System I/O (SIO) (82378IB and 82378ZB)           c:Mar93...
**82379AB     System I/O-APIC (SIO.A)                           <Dec94...
**82380       32-bit DMA Controller w/ Integrated Peripherals 02/01/87
***Notes:...
***Info: ...
***Versions:...
***Features:...
**82380FB/AB  PCIset: 82380FB Mobile PCI-to-PCI Bridge(MPCI2) 02/17/97...
**82384       Clock Generator and Reset Interface                  c86...
**82385       32-bit Cache Controller for 80386               09/29/87...
**82385SX     32-bit Cache Controller for 80386SX             01/25/89...
**82395DX     High Performance Smart Cache                    06/18/90...
**82395SX     Smart Cache                                     12/17/90...
**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:
***440FX (Natoma)       05/06/96...
***440LX (Balboa)       08/27/97...
***440BX (Seattle)      c:Apr'98...
***440DX (?)            c:?...
***440EX (?)            c:Apr'98...
***440GX (Marlinespike) 06/29/98...
***440ZX & 440ZX-66 (?) 01/04/99...
***440ZX-M (?)          05/17/99...
***440MX (Banister)     05/17/99...
**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...
*Symphony...
*TI (Texas Instruments)...
*UMC...
*Unresearched:...
*VIA...
*VLSI...
*Western Digital...
*Winbond...
*ZyMOS...
*General Sources:...