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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...
**M1535/D        South Bridge                                        ?
***Info:
The  M1535  provides the  highest  integration  south bridge  solution
between PCI bus and Peripheral buses for personal computer systems. It
includes audio, high-speed modem, Super  I/O and Fast IR integrated in
to  one chip to  complement any  one of  ALi’s North  Bridge solutions
namely M1541, M1621 and M1631.

The  M1535 is  PCI spec.   2.2 compliant.   It provides  steerable PCI
Interrupts for PCI device Plug-and-Play, it has up to 8 PCI interrupts
routing, it  has level to edge  trigger transfer. It  has enhanced DMA
controller.  It  provides 14 interrupt channels  as Interrupt Control-
ler.  It provides 8254 Compatible timers for system timer, Refresh Re-
quest,  Speaker  Output  use.  It  has  7  DMA  channels that  can  be
arbitrarily programmed as distributed  channels.  It provides 1 PC/PCI
DMA channel interface.  It supports serialized IRQ in quiet/continuous
mode.  It  supports Plug-and-Play.  It  has built-in PS2  Keyboard and
mouse controller.  It provides hot plugging events detection.

The M1535 also provides the  best power management solution. The M1535
integrates  ACPI   support,  deep  green   function,  2-channel  Ultra
DMA-33/66  IDE bus  master  controller, 4-port  USB controller,  SMBus
controller,  Super  I/O, audio  system  and  software  modem into  one
27mmx27mm BGA  (Ball Grid Array)  chip. 

Further  more, the  M1535  is  designed to  meet  the requirements  of
desktop, mobile PCs.

***Versions:...
***Features:...
**
**May not exist:...
**Later Chipsets:...
**Other:...
*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...
**82485       Turbo Cache (and 485Turbocache)                      c90
***Notes:...
***Info:...
***Versions:...
***Features:...
**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:...