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**82489DX       Advanced Programmable Interrupt Controller    10/12/92
***Notes:...
***Info:...
***Versions:...
***Features:...
**82495DX/490DX DX CPU-Cache Chip Set                           <Sep91...
**82495XP/490XP Cache Controller / Cache RAM (for i860)       06/05/91...
**82496/491     Cache Controller / Cache RAM (for P5 Pentium) 03/22/93...
**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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*Motorola...
*OPTi...
**82C495XLC      PC/AT Chip Set                                   c:93
***Info:...
***Configurations:...
***Features:
o   Low cost, low power, CMOS Technology
o   Supports 386DX, 486 DX/DX2/SX CPUs as well as Intel
    P24T and Cyrix Cx486S/S2 and Cx486DX/DX2 CPUs
o   One 160-pin CMOS Plastic Flat Package (PFP), one 84
    pin PLCC (or one 100-pin PFP)
o   Internal buffers and termination to reduce external parts count
o   Copy-Back Direct-Mapped Cache: 32/64/128/256KB for 386, and 
    64/128/256/512KB for 486
o   Up to 10% performance enhancement from write-through cache scheme
o   Supports 2-1-1-1 or 3-2-2-2 cache cycles
o   On-chip comparator determines cache hit/miss
o   Up to 64MB of local high-speed, page mode DRAM memory space
o   Burst line fill during cache read-miss
o   Control of one non-cacheable region
o   Shadow RAM support for system, video and adapter card BIOS
o   Optional caching of shadowed video BIOS
o   Hidden refresh support to enhance system performance
o   Turbo/slow speed selection (386 mode only)
o   AT bus clock selectable from CLKI (/6, /5 /4, /3)
o   CAS-before-RAS refresh reduces power consumption
o   Optional 0 or one wait state for cache write-hit
o   387 coprocessor support for 386 mode
o   Internal CD and CA bus pull-up resistors to save components and 
    board real-estate
o   Comprehensive VL bus and OPTi high-performance local bus support
o   On-chip hardware provides direct support for up to two
    VL bus master devices 


**82c496A/B      DXBB PC/AT Chipset                             <Mar92
***Notes:...
***Info:...
***Configurations:...
***Features:...
**82C496/7       DXBB PC/AT Chipset (Cached)                 <01/16/92...
**82C498         DXWB PC/AT chipset [no datasheet]                   ?...
**82C499         DXSC DX System Controller                        c:93...
**82C546/547     Python PTM3V                                     c:94...
**82C556/7/8     Viper [no datasheet]                                ?...
**82C556/7/8N    Viper-N  Viper Notebook Chipset             <05/25/95...
**82C556M/7M/8E  Viper-N+ Viper Notebook Chipset                  c:96...
**82C566/7/8     Viper-Max Chipset Scalable MultiMedia PC Solution   ?...
**82C571/572     486/Pentium                                      c:93...
**82C576/7/8     Viper Xpress  [no datasheet]                        ?...
**82C576/8/9     Viper XPress+ [no datasheet, some info]     <01/16/97...
**82C596/597     PTMAWB Pentium Adaptive Write-back (Cobra)       c:93...
**82C650/1/2     Discovery (Pentium Pro) [no datasheet]              ?...
**82C681/2/6/7   386/486WB EISA                                   c:92...
**82C683         386/486AWB EISA [no datasheet]                      ?...
**82C693/6/7     Pentium uP Write Back Cache EISA                 c:93...
**82C700         FireStar                                         c:97...
**82C701         FireStar Plus                                    c:97...
**82C750         Vendetta      [no datasheet]                        ?...
**82c801         SCWB2 DX Single Chip Solution                    c:92...
**82C802         SCWB2 PC/AT Single Chip [no datasheet]              ?...
**82C802G/GP     System/Power Management Controller (cached)      c:93...
**82C895         System/Power Management Controller (cached)   c:Sep94...
**82C898         System/Power Management Controller (non-cache)c:Nov94...
**
**Support Chips:
**82C601/2       Buffer Devices                                 <Nov94...
**82C822         PCIB (VLB-to-PCI bridge)                         c:94...
**Other:...
*PC CHIPS/Amptron/Atrend/ECS/Elpina/etc...
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