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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...
*ALD...
*ALi...
*AMD . . . . . . . [no datasheets, some info]...
*Chips & Technologies...
**82C735   I/O Peripheral Controller With Printgine            c:Jul93
***Info:...
***Versions:...
***Features:
Floppy Disk Controller
o   Single-chip floppy solution
o   Software compatible with NEC 765B and Intel 82077
o   Perpendicular recording support
o   48mA disk drivers and Schmitt-trigger inputs
o   Direct support for two drives, and up to four drives with external 
    decoder
o   Enhanced digital data separator
o   No external filter components required
o   Support for 250KB/s, 300KB/s, 500KB/s and 1MB/sec data rates
o   Primary and secondary floppy address port selects

Serial Ports
o   Two NS16550 compatible UARTs
o   16-byte FIFO
o   Modem control circuitry
o   Optional PS/2 type mouse port logic operated under BIOS and 
    software driver control

IDE Interface
o   Provides a complete IDE interface for embedded hard disk drives.
o   Primary and secondary IDE address port selects.

Parallel Port----Printgine
o   Multiprotocol parallel port interface, P1284-compatible 
o   Compatible with IBM PC, XT, AT, and PS/2 architectures
o   Standard and bidirectional parallel port
o   Microsoft and Hewlett-Packard Extended Capabilities Port (ECP), 
    Enhanced 
    Parallel Port (EPP), and fast Centronics protocols support
o   Transfer rates up to 2MB/sec possible with fast protocols
o   Protocols implemented in hardware to reduce software overhead
o   24mA parallel port output drivers
o   128-byte FIFO

General
o   100-percent compatible with IBM PC, XT and AT architectures
o   24mA AT/XT bus interface buffers
o   Game port and general purpose chip select logic
o   On-chip power management features, controllable through hardware 
    and/or software
o   Configuration via software
o   100-pin QFP package

**82C835   Single CHIP 386sx AT Cache Controller               c:Apr91...
**F87000   Multi-Mode Peripheral Chip                         11/23/93...
**Other:...
**Disk:...
**Video:...
*Contaq  . . . . . [no datasheets, some info]...
*Efar Microsystems [no datasheets, some info]...
*ETEQ...
*Faraday...
*Forex . . . . . . [List only, no datasheets found]...
*Intel...
**440 series:
***440FX (Natoma)       05/06/96...
***440LX (Balboa)       08/27/97...
***440BX (Seattle)      c:Apr'98...
***440DX (?)            c:?...
***440EX (?)            c:Apr'98...
***440GX (Marlinespike) 06/29/98...
***440ZX & 440ZX-66 (?) 01/04/99...
***440ZX-M (?)          05/17/99...
***440MX (Banister)     05/17/99...
**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:...