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**82395SX     Smart Cache                                     12/17/90
***Notes:...
**82396SX     Smart Cache                                     12/17/90...
**82485       Turbo Cache (and 485Turbocache)                      c90...
**82489DX       Advanced Programmable Interrupt Controller    10/12/92...
**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...
**HT21          386SX/286 Single Chip (20 MHz)                 c:Aug91
***Info:
The HT21  is an  advanced PC/AT compatible,  single-chip 80386SX/80286
design solution.   This highly  integrated single chip  allows simple,
low cost  system design options while featuring  high performance, low
power  consumption,  and minimum  board  space requirements.  Advanced
memory management features  include support for page mode,  2 or 4-way
interleaving in  both pipelined and  non-pipelined modes. The  LIM 4.0
hardware implementation  features dual sets of 32  registers with full
context support for highest performance Optimization of extended local
memory  accesses. An  advanced  EMS hardware  write-protect option  is
provided. The HT21 supports 256K and 1M DRAMs in l by 1, 1 by 4, and 1
by 9 device configurations for up  to 8MB of on-board system memory. A
flexible Shadow  RAM option for  System and Video  BIOS as well  as 8-
16-bit BIOS Options adds to overall design versatility.

A  complete PC/AT  compatible  system with  advanced  features may  be
implemented with minimal external support logic. The HT21 performs all
CPU  and peripheral support  functions in  a single  chip.  Integrated
device  functions include  DMA Controllers,  a Memory  Mapper, Timers,
Counters, Interrupt  Controllers, a Bus Controller  and all supporting
circuitry for PC  core logic requirements. The chip  also contains all
the  necessary  address buffers,  data  transceivers, memory  drivers,
parity  checking   and  supporting  circuitry  for   a  complete  high
performance computer solution. An asynchronous AT Bus clock allows for
a constant 8MHz Bus clock rate for highest bus device compatibility as
defined in  IEEE Spec P996.   In controlled bus applications  the HT21
supports up to a  12 MHz Bus Clock rate. This device  is packaged in a
208-pin Plastic Quad Flat Pack combining several external buffers into
this space saving solution.

***Configurations:...
***Features:...
**HT22          386SX/286 Single Chip (25 MHz)                 c:Sep91...
**HT25          3-volt Core Logic for 386SX                    c:Dec92...
**HT35          Single-Chip Peripheral Controller [partial info]     ?...
**HTK320        386DX Chip Set                                 c:Sep91...
**HTK340        "Shasta" 486 Chip Set                          c:Jun92...
**Support Chips:
**HT44          Secondary Cache                                c:Jun92...
**Other:...
*HMC (Hulon Microelectronics)...
*Logicstar...
*Motorola...
*OPTi...
*PC CHIPS/Amptron/Atrend/ECS/Elpina/etc...
*SIS...
*Symphony...
*TI (Texas Instruments)...
*UMC...
*Unresearched:...
*VIA...
*VLSI...
**VL82C521/522     Lynx/M                                            ?
***Info:...
***Configurations:...
***Features:
o   Support for Pentium and Pentium-class CPUs
o   64-bit wide SDRAM, EDO, and FPM DRAM controller
o   Nine-deep, 64-bit fast-access smart write buffers
o   Fully PCI 2.1 compliant, 33MHz, synchronous or asynchronous, high
    performance (120 MB/s) PCI bus with full concurrency to support 
    high bandwidth multi-media
o   Flexible L2 write-back cache controller supporting 3-1-1-1-1-1-1-1
    burst cycles
o   Highly integrated chipset in low-profile BGA packages
o   Active thermal feedback (ATF) for closed-loop thermal control of 
    the CPU
o   PCI bridge support for high-performance primary PCI hot docking
o   Common Architecture Serial Bus minimizes docking connector pin 
    count
o   SMB/I2C system management bus improves battery monitoring
o   Singular ROM for keyboard, System and graphics BIOS
o   Full 2 channel Bus Mastering IDE controller
o   Integrated '077 FDC
o   Two 16550 UARTs
o   8052 keyboard controller with built-in scan for matrix keyboards and
    boot controller functionality
o   system clocks from power-managed PLLs with on-board buffering for
    distribution
o   Two PWMs to provide LCD backlight and contrast control
o   Parallel port with PS2, EPP and ECP extensions
o   Built-in IrDA 1.1 Fast Infrared communications port
o   Multiple VCC rails and on-board level shifters to provide inder-
    pendent power-down and true 5.0 Vdc peripheral support
o   Support for three PS2 ports
o   Real-Time Clock with CMOS
o   25 GPIO pins with expansion
o   Built-in Sub-ISA bus for 16-bit DMA ISA Master audio device
o   Supports 3.3V and 0V suspend with multiple resume events, I/O
    trapping, and audio 0V suspend/resume
o   Bus Keeper I/Os to reduce battery drain in suspend mode
o   Supports shut-down option for CPU core power during powered
    suspend to maximize battery life
o   Supports CPU clock division emulation to effectively reduce CPU
    clock frequency
o   Plug-N-Play support
o   Compliant with Microsoft recommendations for Win '95

**VL82C530         Eagle Ð                                         c95...
**VL82C541/543     Lynx                                            c95...
**VL82C591/593     SuperCore 590                                   c94...
**VL82C594/596/597 Wildcat                                         c95...
**I/O Chips:
**VL82C106 Combination I/O chip                                      ?...
**VL82C107 SCAMP  Combination I/O chip                               ?...
**VL82C108 TOPCAT Combination I/O chip                               ?...
**VL82C110 Combination I/O chip                                      ?...
**VL82C113 SCAMP  Combination I/O chip                               ?...
**VL82C114 Combination I/O chip                                      ?...
**Video: ...
**Disk:...
**Modems:...
**Other:...
**Not sure if they actually exist...
*Western Digital...
*Winbond...
*ZyMOS...
*General Sources:...

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