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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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**?????  (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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**HT11          Single 286 AT Chip [no datasheet]               <Aug90...
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**HT18          80386SX Single Chip                            c:Sep91...
**HT21          386SX/286 Single Chip (20 MHz)                 c:Aug91...
**HT22          386SX/286 Single Chip (25 MHz)                 c:Sep91...
**HT25          3-volt Core Logic for 386SX                    c:Dec92...
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**HTK320        386DX Chip Set                                 c:Sep91...
**HTK340        "Shasta" 486 Chip Set                          c:Jun92...
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**HT44          Secondary Cache                                c:Jun92...
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