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**Who made the first chip set?
By the  criteria of (2.)  in  'Definition of a chip  set' many sources
state this  to be the  Chips and Technologies  NEAT chip set.  I don't
know why this is stated as it is most definitely incorrect. The CS8221
NEW   Enhanced  AT   (NEAT)  chip   set  consisting   of  the   chips;
82C211/82C212/82C215/82C206  was  as far  as  I  can establish,  first
released sometime in 1986. 

C&T itself have an earlier chip set called the CS8220 PC/AT compatible
Chip  Set,  and  consists   of  the  following  chips;  82C201/82C202/
82A203/82A204/82A205.  It was  first  available  in OCT-85.  (see:C&T>
CS8220>Notes for further info.)

That is, AFAIK, the first motherboard  chip set from C&T and AFAIK the
worlds first chip set that meets the criteria of (2.). However C&T did
already have on the market their  popular EGA chip set, but that isn't
a motherboard chip set.

By the criteria of (1.), IBM, or Intel, see IBM>PC/XT chip set.

Another pre-'86 chipset is the  Faraday FE2010. The datasheet includes
a schematic on the very last  page dated 11/22/85. This only indicates
the chip set was on paper at that date. An acutal release date has not
been found.

**Spelling errors/mistyped words...
**Info needed on:...
**A note on VESA support of 486 chipsets....
**Datasheets:...
*_IBM...
*ACC Micro...
**ACC2020    Power Management Chip                                 c92
***info:...
***Versions:...
***Features:
o   Provides eight trigger input channels for monitoring activities 
    such as keyboard, video, hard disk, floppy disk, and user defined 
    device.
o   Provides eight power control outputs
o   Each power control output status can be determined by the 
    combinations of the eight trigger inputs
o   Provides eight user programmable time-out timers.
o   Flexible timer scales:
      2 timers from 1/8 second to 14 seconds
      4 timers from 1 minute to 15 minutes
      1 timer from 2 minutes to 210 minutes
      1 timer from 4 minutes to 7 hours
o   Each trigger input can select one of the two timer scales
o   No glitch CPU clock switching functions
o   Supports CPU clock up to 66 MHz
o   Generates 16 MHz clock for AT Bus
o   Generates 32.768 KHz for both RTC and Ao02020 by using 32.768 KHz 
    crystal
o   Supports Modem ring power-on
o   Supports scheduled power-on
o   Supports cover switch power-down/on
o   Supports Suspend and Resume
o   Provides six operation modes:
      Full Operation mode
      Rest mode
      Standby mode
      Shutdown mode
      Freeze mode
      Off mode
o   Predefined mode transition among Normal Rest. and Standby modes
o   Programmable transitions of operation modes
o   Provides interrupt request for suspend resume operation
o   Interrupt request output can be masked
o   Supports Programmable Slow Refresh in Shutdown and Freeze modes
o   Supports CAS before RAS refresh
o   80-pin QFP

**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...
**82395SX     Smart Cache                                     12/17/90
***Notes:...
**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...
*PC CHIPS/Amptron/Atrend/ECS/Elpina/etc...
*SIS...
*Symphony...
*TI (Texas Instruments)...
*UMC...
*Unresearched:...
*VIA...
*VLSI...
*Western Digital...
*Winbond...
*ZyMOS...
*General Sources:...