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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...
**800 series...
*Headland/G2...
*HMC (Hulon Microelectronics)...
*Logicstar...
**Other:
SL7001 MDA Graphics Controller
SL5001 Parallel Printer Port Interface
SL2002 Dual Channel NRZI Encoder / Decoder
SL4000 Lan controller

*Motorola...
*OPTi...
**82C498         DXWB PC/AT chipset [no datasheet]                   ?
***Notes:...
**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
***Notes:...
***Info:...
***Configurations:...
***Features:
System 
o   100% PC/AT compatible
o   Supports 3.3V Intel Pentium 75/90/100/120 processors at bus 
    frequencies up to 66MHz
o   Supports Cyrix 6x86 processor

DRAM 
o   Full 64-bit FPM/EDO DRAM controller
    - Supports 2-2-2 EDO pipeline at 66MHz bus speed
    - Supports 5V or 3.3V DRAM with-out buffers
    - Supports up to 512MB
    - Controls up to 6 banks
    - Post write buffer
o   Selectable current drive for DRAM bus 

Cache 
o   L1 Cache supports write-through and write-back modes
o   Power managed L2 Cache
    - 64KB-2MB cache
    - Write-back or write-through modes
    - 2-1-1-1 synchronous cache cycles
    - 3-1-1-1 pipelined synchronous cache cycles
    - Combined tag/dirty SRAM option

ISA/VL/PCI Bus 
o   Integrated PCI bus with operation up to 33MHz; supports up to 
    three masters
o   CLKRUN# support for PCI
o   Distributed DMA support (software-based)
o   100% AT-compatible ISA bus; 3.3V or 5V operation, also supports 
    ISA bus masters
o   VL bus support (slave only)
o   Integrated Local Bus IDE supports four drives, which can be bus 
    masters, modes 4 and 5 supported  

Power Management
o   Advanced Power Management Unit
o   Full CPU System Management Mode (SMM) support
o   Full CPU power control through "clock throttling"
o   Full system clock control, even CPU clock can be stopped during 
    APM doze mode
o   Both hardware and software controlled power management
o   Full peripheral power control
o   13 flexible peripheral timers
o   Sixteen power control pins
o   I/O trapping captures address and data
o   Distributed DMA support (software-based)
o   Full peripheral activity tracking
o   Automatic peripheral power-up/power-down features
o   Full suspend current leakage control
o   36 Power Management Interrupt (PMI) sources
o   Eight external power management interrupt sources
o   Supports SMBASE re-programmability that allows the cache to be
    maintained during system management mode, avoiding cache fills 
    after returning from SMM
o   Proprietary automatic internal pull-up/pull-down resistors 
    activated only when needed to reduce power consumption

Thermal Management
o   Advanced Thermal Management Unit
o   Internal mechanism tracks CPU activity and initiates cool down
    mode before CPU temperature reaches a damaging level
o   External sensor option

Packaging
o   82C556M Data Buffer
    - 176 pin TQFP (0.5mm pin spacing)
o   82C557M System Controller
    - 208 pin TQFP (0.5mm pin spacing)
o   82C558E Peripheral Controller
    - 208 pin TQFP (0.5mm pin spacing)

82C602A RTC/Buffer Companion Chip
o   Integrated Real-Time Clock
o   Based on Benchmark Bq3285
o   256 bytes battery-backed memory
o   Integrates multiplexing/demultiplexing logic, latches, and 
    buffers
o   Eliminates most/all TTL in typical synchronous cache system
o   100 pin TQFP package (0.5mm pin spacing)
o   Also available in 100 pin PQFP
     
**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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*Unresearched:...
*VIA...
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