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**82495XP/490XP Cache Controller / Cache RAM (for i860)       06/05/91
***Notes:...
***Info:
The Intel 82495XP cache controller and 82490XP cache RAM, when coupled
with a user-implemented memory  bus controller, provide a second-level
cache  subsystem  that eliminates  the  memory  latency and  bandwidth
bottleneck for  a wide  range of multiprocessor  systems based  on the
i860 XP  microprocessor. The CPU  interface is optimized to  serve the
i860  XP microprocessor  with zero  wait  states at  up to  50 MHz.  A
secondary cache  built from the  82495XP and 82490XP isolates  the CPU
from  the memory subsystem;  the memory  can run  slower and  follow a
different protocol than the i860 XP microprocessor.
         
***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)...
*Logicstar...
**SL9250  Page Mode Memory Controller (16/20MHz 8MB Max)        <oct88
***Info:...
***Versions:...
***Features:...
**SL9350  Page Mode Memory Controller (16/20/25MHz 16MB Max)    <oct88...
**Other:...
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*Winbond...
**W83777F/87F     Power I/O   (Multi I/O)                          <95
***Info:...
***Versions:...
***Features:
o   Compatible with IBM PC AT disk drive systems
o   Variable write pre-compensation with track selectable capability
o   DMA enable logic
o   Non-burst mode DMA option
o   Supports floppy disk drives and tape drives
o   Detects all overrun and underrun conditions
o   Data rate and drive control registers
o   Built-in address mark detection circuit to simplify the read 
    electronics
o   IBM PC system address decoder
o   Supports up to two embedded hard disk drives (IDE AT BUS)
o   Single 24 MHz crystal input
o   Two high-speed 16550 compatible UARTs with 16-byte send/receive 
    FlFOs
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 by 1 to
    (2^16 - 1)
o   Compatible with IBM parallel port
o   Supports parallel port with bi-directional lines
o   Supports Enhanced Parallel Port (EPP)
    - Compatible with IEEE 1284 specification
o   Supports Extended Capabilities Port (ECP)
    - Compatible with IEEE 1284 specification
o   Extension FDD mode supports disk drive B through parallel port
o   Extension Adapter Mode supports pocket devices through parallel 
    port
o   Extension 2FDD mode supports disk drives A and B through parallel
    port
o   JOYSTICK mode supports joystick through parallel port
o   Programmable configuration settings
o   Immediate or automatic power-down mode for power management
o   All hardware power-on settings have internal pull-up or pull-down
    resistors as default value
o   FDD anti-virus functions with software write protect and FDD 
    write enable signal, write data signal force inactive
o   Packaged in 100-pin QFP

W83777F:
o   Supports 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
o   250K, 300K, 500K, 1M bps data transfer rate
o   Supports vertical recording format
o   16-byte data FIFOs
o   Pins and functions downward compatible with W83757F, W83757AF, 
    W83767F, and W83787F

W83787F:
o   Supports up to four 3.5-inch or 5.25-inch floppy disk drives
o   Completely compatible with industry standard 765
o   360K/720K/1.2M/1.44M format
o   250K, 300K, 500K bps data transfer rate
o   Pins and functions downward compatible with W83757F, W83757AF, 
    and W83767F

**W83877F         WINBOND I/O (Multi I/O)                          <96...
**W83877TF/TG/TD  WINBOND I/O (Multi I/O)                          c97...
**W83977F/G/AF/AG WINBOND I/O (Multi I/O)                          c97...
**W83977TF        WINBOND I/O (Multi I/O)                          c97...
**W83977EF        WINBOND I/O (Multi I/O)                          <98...
**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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