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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...
**ACC2087    Enhanced Super Chip (486 Single Chip)              <Aug96
***Info:...
***Configurations:...
***Features:
o   Supports Intel iDX4, AMD AM486, Cyrix 5x86, TI 486s, and IBM Blue 
    Lightning microprocessor with operation up to 50 MHz
o   3.3V / 5.0V mixed voltage system design
o   Level 1 Write Back Cache
o   Level 2 Cache Controller
    - Support either write back or write through implementation
    - Up to 2 MB in cache size
o   High Performance DRAM Controller
    - Supports four banks of 32-bit DRAM, Fast Page Mode only, 
      allowing up to 64 MB memory
o   Integrated Peripheral Controller: 2 x 8237, 2 x 8259, 1 x 8254, 
    1 x 74612
o   Integrated Floppy Disk Controller supports two floppy disk drives
o   Supports one IDE interface
o   Supports two high speed 16C550 compatible UARTs with 16 Byte FIFOs
o   Supports one bi-directional Parallel port with ECP mode
o   Support PPM mode where Floppy Disk Drive can be used on Parallel 
    Port
o   PS/2 compatible Keyboard Controller and Mouse
o   Power Management Control
    - Power-On Suspend
    - Power-Off Suspend
    - Doze / Idle Detection
    - Suspend / resume Button
    - APM support
    - SMM / SMI
    - Stop Clock Protocol
    - Battery monitoring signal and dedicated low-battery warning 
      alarm
o   Supports Flash EPROM
o   Local Bus IDE
o   Fast reset / Fast gate A20 (Port 92)
o   256-pin PQFP device
**ACC2089    486 PCI-based System Super Chip      [no datasheet]     ?...
**ACC2168/GT 32-bit 486 Green System Single Chip  [no datasheet]     ?...
**ACC2178A   32-bit 486 Green System Single Chip  [no datasheet]     ?...
**ACC2268    ?486                                 [no datasheet]     ?...
**ACC????    Maple/Maple-133 486-System-On-Chip   [no datasheet]     ?...
**
**Support Chips:
**ACC2016    Buffer and MUX Logic                                  c96...
**ACC2020    Power Management Chip                                 c92...
**ACC5500    Multifunction I/O Control Chip for PS2 Model 50/60    c88...
**
**Other chips
ACC1200   Clock synthesizer Supports Pentium-Pro and Pentium-class PCI
ACC16C451 Multi I/O 1x16450/1xLPT
ACC16C452 Multi I/O 2x16450/1xLPT
ACC16C461 Multi I/O 1x16450/1xLPT
ACC2042   Keyboard/Mouse Controller
ACC2188   PCI bus controller  Support 32-bit PCI Bus interface with built-in power management control and synchronous / asynchronous clock feature. 
ACC3201   PC/XT/AT FDD Controller
ACC3202   PS/2 FDD Controller
ACC3203   PS/2 FDD Controller
ACC3211   PC AT/XT FDD Controller (x4) + with IDE
ACC3221   Multi I/O Controller, floppy/IDE/2x16450/1xLPT
ACC3223   Multi I/O Controller, floppy/IDE/2x16550/1xLPT
ACC3350   Ultra SCSI 
ACC3360   UltraWide SCSI 
ACC3618   3D surround controller ISA
ACC5810   Micro Channel Interface Chip
ACC808 	  Plug-and-Play Controller
ACC????   Manhattan PCI-based FireWire for Pentium
ACC????   Memphis PCI-based CardBus and FireWire

*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...
*Symphony...
*TI (Texas Instruments)...
*UMC...
*Unresearched:...
*VIA...
*VLSI...
*Western Digital...
*Winbond...
*ZyMOS...
*General Sources:...