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*AMD . . . . . . . [no datasheets, some info]...
*Chips & Technologies...
*Contaq  . . . . . [no datasheets, some info]...
**82C596/A  3/486 Writeback Cache [no datasheet]             <11/11/92
Possibly  two variant,  or one  version with  two names,  one  being a
shorthand:
82C596
82C596A

ftp://ami.com/archive/Other_Manuals/!index.txt
lists the A variant with the date 11/11/92. No date for non-A:
" 
CTQ596.Z06    	88900   12-21-92  3/486 Contaq 596 chipset    06-06 core  
CTQ596A.Z11   	95383   10-07-93  3/486 Contaq 596-A for 11/11/92  
CTQ596_3.Z06   	92195   03-01-93  386   Contaq 596  
CTQ596_3.Z11    98031  	06-21-93  386   Contaq 596
CTQ596_4.Z06    92236  	03-01-93  486   Contaq 596
CTQ596_4.Z11    97602  	06-21-93  486   Contaq 596
CT596A.Z08   	96217   12-09-93  Contaq 596a  
"
Note, the column of dates is the file date.

**??????    486 EISA chipset [no datasheet]                     <Feb93...
**82C599    PCI-VLB Bridge [no datasheet, some info]                 ?...
**82C693    PCI-ISA Bridge [no datasheet]                            ?...
*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...
**Other alias:
Eurone,  Fugu,     Fugutech,  Hi Sing,   Houston,  Assa,
H Tech,  Matsonic, Minstaple, PCWare,    Pine,     Warpspeed,
Ability, Alton     Aristo,    Asia Gate, Asiatech, AddTech Research,
Hedaka,  Protac,   Hsing Tech,
    
And probably more.
**Notes:
You eventually get  to know when a  board is made by PC  Chips just by
looking at it.
 
Here is a test:
1.  No manufacture name, or one of the above.
2.  If the board has a lots of components that sound like a well known 
    part but aren't the well known part. i.e. 'HX Pro' instead of 
    '430HX'
3a. A really good feature set where you think, that's exactly what I'm 
    looking for.
 b. The features don't really work as intended. 
4.  The price is fantastic.
5.  Its disappointing on closer examination.

PC Chips is  renowned for making crap products. Some  are actually not
too bad, they're no worse than  your average brand. However some are a
nightmare either by design or  just poorly made. Fake components glued
on is not  uncommon. Fake labels over other components.  PCB's so thin
they require low insertion force ISA connectors, every trick to save a
few $.

**Early Chipsets:...
**Later Chipsets:...
*SIS...
*Symphony...
*TI (Texas Instruments)...
*UMC...
*Unresearched:...
*VIA...
*VLSI...
*Western Digital...
*Winbond...
*ZyMOS...
*General Sources:...