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**82C591/2  3/486                                               <Mar92
The BIOS companion. (Croucher, Phil) available here:
https://archive.org/details/pc_engineers_vol1_BIOS

Lists this as:
82C591/82C592 WriteBack

Also listed in:
ftp://ami.com/archive/Other_Manuals/!index.txt
"
CTQ3591.Z12     55546   03-17-92  386   Contaq 82c591 chipset  
CTQ4591.Z12     57510   03-17-92  486   Contaq 82c591 chipset  
CTQ591A.Z11    	84994   02-08-93  3/486 Contact 591-A chipset  
"

Indicating there is an A variant of the 82C591, the 82C591A.

**82C593    3/486 [no datasheet]                                <May92...
**82C596/A  3/486 Writeback Cache [no datasheet]             <11/11/92...
**??????    486 EISA chipset [no datasheet]                     <Feb93
PC Mag 23 Feb 1993 p124 - 
Advert for DX2 66MHz EISA system, with Contaq chipset.

**82C599    PCI-VLB Bridge [no datasheet, some info]                 ?...
**82C693    PCI-ISA Bridge [no datasheet]                            ?...
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**?????  (Profusion)    c:99
Chips:         
Memory Access Controller (MAC)  
Data Interface Buffer (DIB)
CPUs:          8x P-III Xeon Oct
DRAM Types:    SDRAM PC100 2-way Interleave dual channel
Max Mem:       32GB
ECC/Parity:    ECC
AGP speed:     N/A
Bus Speed:     100
PCI Clock/Bus: 1/3 PCI-66/64



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**5501/5502/5503 Pentium/P54C PCI/ISA Chipset                <04/02/95
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**5511/5512/5513 Pentium PCI/ISA                             <06/14/95...
**5571           (Trinity) Pentium PCI/ISA Chipset (75MHz)   <12/09/96...
**5581/5582      (Jessie)  Pentium PCI/ISA Chipset (75MHz)   <04/15/97...
**5591/5592/5595 (David)   Pentium PCI A.G.P. Chipset        <01/09/98
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**5596/5513      (Genesis) Pentium PCI Chipset               <03/26/96...
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**540            (Spartan) Super7 2D/3D Ultra-AGP Single C.S.<11/30/99...
**55x            SoC (System-on-chip)                        <03/14/02...
**
**Support chips:
**85C206     Integrated Peripheral Controller [no datasheet]         ?...
**5595       Pentium PCI System I/O                          <12/24/97...
**950        LPC I/O                                         <07/16/99...
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***Notes (Unverified Information!):...
***5600        c:Nov98...
***600         ?...
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***621         ?...
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***630ST/ET    ?...
***633/633T    c:Mar01...
***635/635T    c:Mar01...
***640T        c:Mar01      ...
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