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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...
**M1521/23       Aladdin III       50-66MHz                     <Nov96
***Info:...
***Configurations:...
***Features:
****M1521 System Controller:...
****M1523 PCI-to-ISA Bridge:
[features that only apply to the M1523B are surrounded by [] ]

o   Provides a bridge between the PCI bus and ISA bus
o   PCI interface
    - Supports PCI Master and Slave Interface
    - Supports PCI Master and Slave initiated termination
    - PCI specification 2.1 Compliant (Delay transaction support)
o   Buffers
    - 8-byte bidirectional Line Buffers are provided for DMA/ISA 
      Memory Read/Write cycles to PCI Bus.
    - 32-bit Posted Write Buffer is provided for PCI Memory Write and 
      I/O data write (for sound card) to ISA bus.
o   Provides steerable PCI interrupts for PCI device plug-and-play
    - Up to 8 PCI interrupts routing
    - Level to edge trigger transfer
o   Enhanced DMA Controller
    - Provides 7 programmable channels, 4 for 8-bit data size, 3 for 
      16-bit data size
    - 32-bit addressability
    - Provides Compatible DMA transfers
    - Provides Type F transfers
o   Interrupt Controller
    - Provides 14 interrupt channels
    - Independently programmable Level/Edge triggered channels
o   Counter/Timers
    - Provides 8254 compatible timers for System timer, Refresh 
      Request, Speaker Output use
o   Keyboard controller
    - Built-in PS2/AT Keyboard controller
    - The specific I/O is used to save the external TTL buffer
o  [Distributed DMA support                                         ]
   [- 7 DMA channels can be arbitrarily programmed as distributed   ]
   [  channel                                                       ]
o  [Serialized IRQ support                  ]
   [- Quiet /Continuous mode                ]
   [- 17 IRQ/Data frames                    ]
   [- Programmable START frame pulse width  ]
o   Plug-and-Play Port supports
    - 1 programmable chip select
    - 2 Steerable Interrupt Request lines
o   PMU interface
    - Supports CPU SMM mode, SMI feature
    - Supports programmable stop clock throttle
    - Supports the APM control
    - Provides External Suspend mode Switch/Turbo switch/Ring in 
      switch
    - Provides 4 system states for power saving (On, Doze, Standby, 
      Suspend)
    - Provides 3 timers from 1 second to 300 minutes to individually 
      monitor VGA, MODE, IN status
    - Supports RTC alarm wake up control
o   IDE interface
    - Built-in PCI IDE master controller
    - Supports PIO modes up to mode 5 timings, and multiword DMA mode 
      0, 1, 2
    - 8 x 32-bit pre-read & posted write buffers
    - Dedicated pins for ATA interface
o   Supports up to 256 KB ROM size decode
o  [Supports Universal Serial Bus interface ]
   [- Supports 2 USB ports                  ]
   [- OpenHCI specification 1.0a compliant  ]
o   208-pin PQFP package

**M1531/33/43    Aladdin IV & IV+  50-83.3MHz                <05/28/97...
**M1541/42/33/43 Aladdin V & V+    50-100MHz                         ?...
**M1561/43/35D   Aladdin 7 ArtX    [no datasheet, some info]  11/08/99...
**M6117          386SX Single Chip PC                              <97...
**
**Support Chips:
**M1535/D        South Bridge                                        ?...
**
**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...
**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:...