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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...
**ACC2036    Single Chip Solution 2036 (286/386SX)              <Jul92
***Info:...
***Configurations:...
***Features:
o   100% hardware and software compatible with the IBM PC/AT
o   Fully compatible with
      Intel 8237 DMA controller
      Intel 8259 interrupt controller
      Intel 8254 timer/counter
      Intel 82284 clock generator
      Intel 82288 bus controller
      Tl 74L8612 memory mapper
      ACC 82021 AT chipset
o   Functions include
      7 DMA channels
      3 timer /counter channels
      14 external interrupt channels
      Advanced memory controller
      Power management features
o   Supports 286 and 3868X micro- processors with up to 33 MHz system 
    clock
o   Supports 287 and 387SX coprocessors
o   4-way or 2-way page interleaved memory controller
o   Direct Access Memory Controller
o   Supports EMS 4.0
o   Shadow RAM for BIOS and video
o   Simultaneous EMS and shadow RAM
o   Supports up to 512K EPROM
o   Supports single 8-bit EPROM
o   Supports 64Kx1, 256Kx1, 256Kx4, 1Mx1, 1Mx4, 4M x1 DRAM memories up
    to 16 MB
o   Supports up to 8 banks of Memory
o   Supports mixed type of DRAM memories from one bank to another
o   On board 128K-64oK RAM can be disabled
o   Speed change via hardware or software
o   Supports dynamic remapping of 640K through 1M memory range
o   Supports pipelined mode operation
o   Programmable wait states for ROM
o   Built-in bus conversion logic for 16-bit to 8-bit transfers
o   Quick software switch from protected mode to real mode for OS/2 
    optimization
o   Programmable I/O address decoder
o   Supports standby mode operation at as low as 1MHz
o   Power-saving features:
      Selectable operating frequency.
      Unused RAS lines can be shutoff.
      Optional slow DRAM refresh.
      Detect video display activities.
      CLKSER and CLK8042 can be shut off.
o   Data and address buffers
o   Parity bit can be disabled
o   1.0/0.8 micron high performance CMOS technology
o   208-pin PQFP package

**ACC2046/ST 486DX/486SX/386DX Single Chip AT                   <Jul92...
**ACC2048    WB 486 Notebook/Embedded Single Chip [no datasheet]     ?...
**ACC2051/NT PCI Single Chip Solution for Notebook Applications    c96...
**ACC2056    ?Pentium 3.3V Notebook               [no datasheet]<Jan96...
**ACC2057    PCI Notebook/Embedded Single Chip    [no datasheet]<Aug96...
**ACC2066NT  486 Notebook/Embedded Single Chip    [no datasheet]     ?...
**ACC2086    486 VL-based System Super Chip Soluti[no datasheet]     ?...
**ACC2087    Enhanced Super Chip (486 Single Chip)              <Aug96...
**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...
*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...
**82496/491     Cache Controller / Cache RAM (for P5 Pentium) 03/22/93
***Notes:...
***Info:...
***Configurations:...
***Features:...
**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:...