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*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...
**82395SX     Smart Cache                                     12/17/90
***Notes:
date source: TimelineDateSort7_05.pdf.

Also states:  82395SX (8-kilobyte);  82396SX (16-Kbyte);  Extension of
386(TM) Smart cache architecture with two new versions of cache memory
controllers.  Designed for  20-megahertz  Intel386 SX  microprocessor-
based systems

Could not find datasheet, see 82396SX, YMMV.

**82396SX     Smart Cache                                     12/17/90...
**82485       Turbo Cache (and 485Turbocache)                      c90...
**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...
**82C822         PCIB (VLB-to-PCI bridge)                         c:94
***Notes:
OPTi 82C822 is a VLB-to-PCI bridge compatible with many chipsets.

From some Usenet posting (lost source sorry):

"Opti never  had a 486 PCI  chipset. All mainboards  with the chipsets
82C802,   82C895,    82C571,   82C596   (aka    "Premium")   use   the
VLB-->PCI-bridge  "chipset"  82C822  for  the  implementation  of  PCI
functionality.

Apparently this  chipset will only  allow 1 32-bit burst  transfer per
bus arbitration  cycle, which limits  throughput to 8 MB/s  instead of
(the maximum ideal transfer rate of) 132 MB/s."


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