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**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...
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*Forex . . . . . . [List only, no datasheets found]...
*Intel...
**82496/491     Cache Controller / Cache RAM (for P5 Pentium) 03/22/93
***Notes:
Date source: TimelineDateSort7_05.pdf

Information taken from: 
            1995_Intel_Pentium_Processors_and_Related_Components.pdf*
                                         8249x Cache controllers.pdf**

>*  Datasheet dated Oct'93
>** Datasheet undated, whole document dated '95

The info and features section have  been solely sourced from the first
source.   The  second source  provides  far  more detail.   Additional
information in  the configurations section  has been sourced  from the
second.

This  chip was  used on  the Pentium  66MHz CPU  complexes of  Intel's
Xpress platform.   Specifically the  BXCPUPENT66 (Single  66MHz, eight
82491s) and BXCPU2XPENT (Dual 66 MHz,  eight 82491s). Also found on P5
60/66MHz CPU complexes of IBM 9595/PC Server 300/500 systems.

***Info:...
***Configurations:...
***Features:...
**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...
**HT35          Single-Chip Peripheral Controller [partial info]     ?
***Notes:...
**HTK320        386DX Chip Set                                 c:Sep91...
**HTK340        "Shasta" 486 Chip Set                          c:Jun92...
**Support Chips:
**HT44          Secondary Cache                                c:Jun92...
**Other:...
*HMC (Hulon Microelectronics)...
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*Unresearched:...
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*General Sources:...