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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...
**82C599    PCI-VLB Bridge [no datasheet, some info]                 ?...
**82C693    PCI-ISA Bridge [no datasheet]                            ?...
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***440FX (Natoma)       05/06/96...
***440LX (Balboa)       08/27/97...
***440BX (Seattle)      c:Apr'98...
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***440EX (?)            c:Apr'98...
***440GX (Marlinespike) 06/29/98...
***440ZX & 440ZX-66 (?) 01/04/99...
***440ZX-M (?)          05/17/99
Note Mobile version of 440ZX
Chips:         
[82443ZX] (PAC) [82371EB] (PIIX4E)
CPUs:          Single P-II/Celeron
DRAM Types:    SDRAM
Mem Rows:      4  ???
DRAM Density:  16Mbit 64Mbit ???
Max Mem:       256MB
ECC/Parity:    No
AGP speed:     1x 2x
Bus Speed:     66 100
PCI Clock/Bus: 1/2 1/3 PCI 2.1



***440MX (Banister)     05/17/99...
**450NX  (?)            06/29/98:...
**?????  (Profusion)    c:99...
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**5120           Pentium PCI/ISA Chipset (Mobile)            <01/28/97...
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**5511/5512/5513 Pentium PCI/ISA                             <06/14/95...
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**5591/5592/5595 (David)   Pentium PCI A.G.P. Chipset        <01/09/98...
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**55x            SoC (System-on-chip)                        <03/14/02...
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**5595       Pentium PCI System I/O                          <12/24/97...
**950        LPC I/O                                         <07/16/99...
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