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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...
**82C711   Universal Peripheral Controller II                  c:Jan91
***Info:
The 82C711/712 Universal Peripheral  Controller II (UPC II) are single
chip  controllers offering  a complete  I/O solution  for the  PC-XT &
PC-AT   environments.  The   82C711   and  82C712   chips  are   nearly
operationally and pin identical.

The  82C711  supports the  MOTHERBOARD  application.  It provides  one
enhanced parallel port  (printer/bi-directional), two 16450 UARTs, one
IDE  XT/AT  hard  disk  interface  and  floppy  disk  controller.  The
configuration is  software controllable which can  be integrated into
system BIOS. Power management is  done through the PWRGD pin. When the
chip is powered down (PWRGD  inactive), the current drawn is less that
250  micro  amp.   All  inputs  are  disabled  and   all  outputs  are
inactive. The contents of all  the registers are preserved, as long as
the power supply to the 82C711 is maintained.

The 82C712 supports the  ADAPTER applications. It provides one printer
port,  two  16450 UARTs,  IDE  AT  hard  disk interface,  floppy  disk
controller, and one game port chip select.

The 82C711/712 feature 24 mA  drives for the output buffers, including
the  host data  bus  and parallel  port  data bus.  The floppy  output
drivers  are  capable  of  sinking  48mA. The  host  interface  is  PC
compatible and  can be connected  directly to the bus  (DO-D7, A0-A9,
IOR, IOW, AEN, IRQ3, IRQ4, FINTR, PINTR, and RESET).

***Versions:...
***Features:...
**82C712   Universal Peripheral Controller II                  c:Jan91...
**82C721   Universal Peripheral Controller III                 c:May93...
**82C735   I/O Peripheral Controller With Printgine            c:Jul93...
**82C835   Single CHIP 386sx AT Cache Controller               c:Apr91...
**F87000   Multi-Mode Peripheral Chip                         11/23/93...
**Other:...
**Disk:...
**Video:...
*Contaq  . . . . . [no datasheets, some info]...
*Efar Microsystems [no datasheets, some info]...
*ETEQ...
*Faraday...
*Forex . . . . . . [List only, no datasheets found]...
*Intel...
**82495DX/490DX DX CPU-Cache Chip Set                           <Sep91
***Notes:...
***Info:...
***Configurations:...
***Features:...
**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:...