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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]                            ?...
*Efar Microsystems [no datasheets, some info]...
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**450NX  (?)            06/29/98:
Chips:
[82454NX] (PXB) [82453NX] (MUX) 
[82452NX] (RCG) [82451NX] (MIOC) 
[82371EB] (PIIX4E),                            
CPUs:          Single/Dual/Quad P-II Xeon/P-III Xeon
DRAM Types:    FPM EDO 2-way Interleave 4-way Interleave
Mem Rows:      8
DRAM Density:  16Mbit 64Mbit
Max Mem:       8GB
ECC/Parity:    Both
AGP speed:     N/A
Bus Speed:     100
PCI Clock/Bus: 1/3


**?????  (Profusion)    c:99...
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**5596/5513      (Genesis) Pentium PCI Chipset               <03/26/96
***Info:...
***Configurations:...
***Features:
o   Supports Intel Pentium CPU and other compatible CPU at 
    66/60/50MHz (external clock speed)
o   Supports VGA Shared Memory Architecture
    - Direct Memory Accesses
    - Shared Memory Area 0.5M, 1M, 1.5M, 2M, 2.5M, 3M, 3.5M, 4M.
    - Built-in 2-Priority Scheme.
o   Supports the Pipelined Address Mode of Pentium CPU.
o   Integrated Second Level (L2) Cache Controller
    - Write Through and Write Back Cache Modes
    - 8 bits or 7 bits Tag with Direct Mapped Cache Organization
    - Supports Pipelined Burst SRAM.
    - Supports 256 KBytes to 1 MBytes Cache Sizes.
    - Cache Read/Write Cycle of 3-1-1-1 Pipelined Burst SRAM at 66 
      Mhz and 3-1-1-1-1-1-1-1 at back to back read cycle.
o   Integrated DRAM Controller
    - Supports 4 RAS lines, the memory size is from 4MBytes up to 
      512Mbytes.
    - Supports 256K/512K/1M/2M/4M/16M x N 70ns FP/EDO DRAM
    - Supports 4K Refresh DRAM
    - Supports 3V or 5V DRAM.
    - Supports Symmetrical and Asymmetrical DRAM.
    - Supports 32 bits/64 bits mixed mode configuration
    - Supports Concurrent Write Back
    - Table-free DRAM Configuration, Auto-detect DRAM size, Bank 
      Density, Single/Double sided DRAM, EDO/ FP DRAM for each bank
    - Supports CAS before RAS "Intelligent Refresh"
    - Supports Relocation of System Management Memory
    - Programmable CAS# Driving Current
    - Fully Configurable for the Characteristic of Shadow RAM (640 
      KByte to 1 Mbyte)
o   Supports EDO/FP 5/6-2-2-2/-3-3-3 Burst Read Cycles
o   Two Programmable Non-Cacheable Regions
o   Option to Disable Local Memory in Non-Cacheable Regions
o   Shadow RAM in Increments of 16 KBytes
o   Supports SMM Mode of CPU.
o   Supports CPU Stop Clock.
o   Supports Break Switch.
o   Provides High Performance PCI Arbiter.
    - Supports 4 PCI Master.
    - Supports Rotating Priority Mechanism.
    - Hidden Arbitration Scheme Minimizes Arbitration Overhead.
    - Supports Concurrency between CPU to Memory and PCI to PCI.
o   Integrated PCI Bridge
    - Supports Asynchronous PCI Clock.
    - Translates the CPU Cycles into the PCI Bus Cycles
    - Provides CPU-to-PCI Read Assembly and Write Disassembly 
      Mechanism
    - Translates Sequential CPU-to-PCI Memory Write Cycles into PCI 
      Burst Cycles.
    - Zero Wait State Burst Cycles.
    - Supports Advance Snooping for PCI Master Bursting.
    - Maximum PCI Burst Transfer from 256 Bytes to 4 KBytes.
o   388-Pin BGA Package.
o   0.5μm CMOS Technology.

**5597/5598      (Jedi)    Pentium PCI/ISA Chipset           <04/15/97...
**530/5595       (Sinbad) Host, PCI, 3D Graphics & Mem. Ctrl.<11/10/98...
**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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