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*_IBM...
*ACC Micro...
*ALD...
*ALi...
*AMD . . . . . . . [no datasheets, some info]...
**AMD 640/645     (Pentium Based on VIA VT82C590) [some info]      c97
640=VT82C595
645=VT82C586B

The  Shuttle  HOT-603 is  the  only  known  motherboard with  the  640
chipset.

There may be another version known  as the 640AGP with AGP support. It
is difficult to determine if this ever existed.

Various sources  state the  AMD 640  is the same  as the  VIA VT82C590
(VP2) chip set. However no first-hand source (datasheet, etc) has been
found. YMMV

**Later Chipsets:...
*Chips & Technologies...
*Contaq  . . . . . [no datasheets, some info]...
*Efar Microsystems [no datasheets, some info]...
*ETEQ...
*Faraday...
*Forex . . . . . . [List only, no datasheets found]...
*Intel...
**82495XP/490XP Cache Controller / Cache RAM (for i860)       06/05/91
***Notes:...
***Info:...
***Features:...
**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...
**HT18          80386SX Single Chip                            c:Sep91
***Info:...
***Configurations:...
***Features:
o   Highly Integrated, Single Chip 80386SX AT Compatible Solution
o   Special Multiple Context Hardware EMS Support (LIM 4.0 compatible) 
    using 2 sets of 32 EMS Registers
o   Single or Dual BIOS
o   Shadow RAM support over entire C0000 to DFFFF Address range in 16K 
    increments, E0000 to FFFFF in 64K increments
o   Page Mode and 2-way Interleaving
o   Supports up to 12MHz AT Bus Clock
o   High Performance Muxed DRAM Interleave
o   Programmable DRAM timing
o   Asynchronous AT Bus Clock
o   Three-State Test Mode
o   16-Bit ROM BIOS Support

HT 18A/B Special Features
o   16 and 20 MHz CPU Clock Speeds
o   Supports up to 8M CPU Memory using combinations of 64K, 256K and 
    1M Devices
o   4 Bank, 4-way Interleave Mode

HT18C/25MHz Special Features
o   16, 20 and 25MHz CPU Clock Speeds
o   Supports up to 20M with EMS CPU Memory using combinations of 256K, 
    1M and 4M Devices

**HT21          386SX/286 Single Chip (20 MHz)                 c:Aug91...
**HT22          386SX/286 Single Chip (25 MHz)                 c:Sep91...
**HT25          3-volt Core Logic for 386SX                    c:Dec92...
**HT35          Single-Chip Peripheral Controller [partial info]     ?...
**HTK320        386DX Chip Set                                 c:Sep91...
**HTK340        "Shasta" 486 Chip Set                          c:Jun92...
**Support Chips:
**HT44          Secondary Cache                                c:Jun92...
**Other:...
*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:...