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**82495XP/490XP Cache Controller / Cache RAM (for i860)       06/05/91
***Notes:...
***Info:...
***Features:...
**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...
*HMC (Hulon Microelectronics)...
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*Motorola...
*OPTi...
**82C496/7       DXBB PC/AT Chipset (Cached)                 <01/16/92
***Info:
The OPTi  82C497 is a Direct  Mapped Write Back  cache controller with
one level write buffer that is  an optional part of the DXBB (Building
Block) Chip  set.  The DXBB also  contains the 82C496  and the 82C206,
which form the  heart of the system.  The 82C497 is  added to the DXBB
chip set for cache based systems.

The OPTi  82C496 offers an  upgradable CPU module  base-board solution
for the 80386  or the 80486 PC/AT system. By  swapping the CPU module,
the  vendor can configure  the 82C496  driven base-board  into various
32-bit AT  systems - 386 or 486  CPU, with cache or  without cache and
rated at 16MHz- 50MHz.

For the Non-Cache systems, the CPU interfaces directly with the 82C496
and the local devices, like the local VGA controller or the local hard
disk adaptor.

For cache based systems the 82C497 (the cache controller) sits between
the CPU and  the 82C496 and the local devices.  All the high frequency
signals are isolated by the  82C497. This allows the base-board to run
at a fixed speed  (25 or 33MHz) - while the CPU  and the Cache can run
synchronously at any determined  rated speed. This provides a reliable
upgrade method for the CPU modules.

***Configurations:...
***Features:...
**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...
*SIS...
*Symphony...
*TI (Texas Instruments)...
*UMC...
*Unresearched:...
*VIA...
*VLSI...
*Western Digital...
*Winbond...
**W83977ATF       WINBOND I/O (Multi I/O)                          <98
***Info:...
***Versions:...
***Features:
General
o  Plug & Play 1.0A compatible
o  Support 13 IRQs, 4 DMA channels, full 16-bit address decoding
o  Capable of ISA Bus IRQ Sharing
o  Compliant with Microsoft PC97 Hardware Design Guide
o  Support DPM (Device Power Management), ACPI
o  Report ACPI status interrupt by SCI signal issued from any of the 
   13 IQRs pins or GPIO xx
o  Programmable configuration settings
o  Single 24/48 Mhz clock input

FDC
o  Compatible with IBM PC AT disk drive systems
o  Variable write pre-compensation with track selectable capability
o  Support vertical recording format
o  DMA enable logic
o  16-byte data FIFOs
o  Support floppy disk drives and tape drives
o  Detects all overrun and underrun conditions
o  Built-in address mark detection circuit to simplify the read 
   electronics
o  FDD anti-virus functions with software write protect and FDD 
   write enable signal (write data signal was forced to be inactive)
o  Support up to four 3.5-inch or 5.25-inch floppy disk drives
o  Completely compatible with industry standard 82077
o  360K/720K/1.2M/1.44M/2.88M format; 250K, 300K, 500K, 1M, 2M bps 
   data transfer rate
o  Support 3-mode FDD, and its Win95 driver

UART
o  Two high-speed 16550 compatible UARTs with 16-byte send/receive 
   FIFOs
o  MIDI compatible
o  Fully programmable serial-interface characteristics:
   - 5, 6, 7 or 8-bit characters
   - Even, odd or no parity bit generation/detection
   - 1, 1.5 or 2 stop bits generation
o  Internal diagnostic capabilities:
   - Loop-back controls for communications link fault isolation
   - Break, parity, overrun, framing error simulation
o  Programmable baud generator allows division of 1.8461 Mhz and 24 
   Mhz by 1 to (2^16-1)
o  Maximum baud rate up to 921k bps for 14.769 Mhz and 1.5M bps 
   for 24 Mhz

Infrared
o  Support IrDA version 1.0 SIR protocol with maximum baud rate up to 
   115.2K bps
o  Support SHARP ASK-IR protocol with maximum baud rate up to 57,600 
   bps
o  Support IrDA version 1.1 MIR (1.152M bps) and FIR (4M bps) protocol
   - Single DMA channel for transmitter or receiver
   - 3rd UART with 32-byte FIFO is supported in both TX/RX transmission
   - 8-byte status FIFO is supported to store received frame status 
     (such as overrun CRC error, etc.)
o  Support auto-config SIR and FIR

Parallel Port
o  Compatible with IBM parallel port
o  Support PS/2 compatible bi-directional parallel port
o  Support Enhanced Parallel Port (EPP) - Compatible with IEEE 1284 
   specification
o  Support Extended Capabilities Port (ECP) - Compatible with IEEE 
   1284 specification
o  Extension FDD mode supports disk drive B; and Extension 2FDD mode 
   supports disk drives A and B through parallel port
o  Enhanced printer port back-drive current protection

Keyboard Controller
o  8042 based with optional F/W from AMIKKEY-2, Phoenix MultiKey/42
   or customer code with 2K bytes of programmable ROM, and 256 bytes 
   of RAM
o  Asynchronous Access to Two Data Registers and One status Register
o  Software compatibility with the 8042 and PC87911 microcontrollers
o  Support PS/2 mouse
o  Support port 92
o  Support both interrupt and polling modes
o  Fast Gate A20 and Hardware Keyboard Reset
o  8 Bit Timer/ Counter
o  Support binary and BCD arithmetic
o  6MHz, 8 MHz, 12 MHz, or 16 MHz operating frequency

General Purpose I/O Ports
o  23 programmable general purpose I/O ports; 1 dedicate, 22 optional
o  General purpose I/O ports can serve as simple I/O ports, interrupt 
   steering inputs, watching dog timer output, power LED output, 
   infrared I/O pins, general purpose address decoder, KBC control
   I/O pins

OnNow Funtions
o  Keyboard wake-up by programmable keys (patent pending)
o  Mouse wake-up by programmable buttons (patent pending)
o  CIR wake-up by programmable keys (patent pending)

Package
o  128-pin PQFP

**
**Disk Controller:
**W83759/A/F/AF   Advanced VL-IDE Disk Controller                  <96...
**W83769          Local Bus IDE Solution                           <94...
**
**UARTS:
**W86C250A  UART (equivalent of INS8C250A) [no datasheet]
**W86C450/P Universal Asynchronous Receiver/Transmitter         <Jul89...
**W86C451   I/O controller for IBM PC/AT/XT                     <Jul89...
**W86C452   I/O controller for IBM PC/AT                         Jul89...
**W86C456   I/O controller [no datasheet]                            ?
**W860551/P UART with FIFO and Printer Port Controller             <94...
**
**Other:...
*ZyMOS...
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