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**82498/493   Cache Controller / Cache RAM (for P54 Pentium)    <Nov94
***Notes:
Date source: 1995_Intel_Pentium_Processors_and_Related_Components.pdf

Information taken from: 
            1995_Intel_Pentium_Processors_and_Related_Components.pdf*
                                         8249x Cache controllers.pdf**
>*  Datasheet dated Nov'94
>** Datasheet undated, whole document dated '95

The info and features section have  been solely sourced from the first
source.   The  second source  provides  far  more detail.   Additional
information in  the configurations section  has been sourced  from the
second.

Difference to 82497/492 is this supports 1 Mbyte to 2 Mbyte cache.

***Info:...
***Configurations:...
***Features:...
**
**Later chipsets (basic spec):
**440 series:...
**450NX  (?)            06/29/98:...
**?????  (Profusion)    c:99...
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*Winbond...
**W83977EF        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 PC98 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

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



**W83977ATF       WINBOND I/O (Multi I/O)                          <98...
**
**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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