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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...
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*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...
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**IBM AT: MC146818 Real Time Clock                                 <84
***Info:
The MC146818  Real-Time Clock  plus RAM is  a peripheral  device which
includes   the   unique   MOTEL   concept   for   use   with   various
microprocessors,  microcomputers,  and  larger computers.   This  part
combines  three unique  features:  a complete  time-of-day clock  with
alarm and one hundred year calender, a programmable periodic interrupt
and square-wave generator,  and 50 bytes of low-power  static RAM. The
MC146818  uses high-speed  CMOS  technology to  interface  with 1  MHz
processor busses, while consuming very little power.

The  Real-Time Clock  plus RAM  has two  distinct uses.  First,  it is
designed  as a  battery powered  CMOS part  (in an  otherwise NMOS/TTL
system) including  all the common battery backed-up  functions such as
RAM, time,  and calendar.  Secondly, the  MC146818 may be  used with a
CMOS  microprocessor  to  relieve  the  software  of  the  timekeeping
workload  and to  extend  the available  RAM  of an  MPU  such as  the
MC146805E2
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