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**82C721   Universal Peripheral Controller III                 c:May93
***Info:...
***Versions:...
***Features:
o   For MOTHERBOARD Applications with configuration via software
o   Low Power CMOS, 100 pin PQFP Package
o   On Chip Power Management Features, Controllable Through Hardware 
    and/or Software
o   100% IBM PC-XT/AT Compatibility.
o   24 mA IBM PC-AT/XT Bus Interface Buffers
o   Schmitt Trigger Input on Reset Pin and FDC interface inputs
o   Two 16450 Compatible UARTs
o   Second serial port data rate can be programmed to support MIDI 
    data rate (31.25KBaud)
o   One IBM PC-XT/AT Compatible Enhanced (Bi-Directional) Parallel 
    Port 
o   24 mA Parallel Port Output Drivers
o   Provides a complete IDE interface for embedded hard disk drives
o   Single 24 MHz Crystal/Oscillator for UART and Floppy Disk 
    Controller
o   Fully uPD72065B and IBM-BIOS Compatible Floppy Controller
    - 48 mA floppy drive interface buffers
    - Data rate and drive control registers
    - Two pin programmable precompensation modes
    - Supports 4 drive interfaces directly without external decoding
    - DMA enable logic
    - Support for 250 kb/s, 300 kb/s and 500kb/s data rates
o   High performance Digital Data Separator
o   Pin and Software Compatible with 82C711
o   No External Filter Components
o   Game Port Chip Select

**82C735   I/O Peripheral Controller With Printgine            c:Jul93...
**82C835   Single CHIP 386sx AT Cache Controller               c:Apr91...
**F87000   Multi-Mode Peripheral Chip                         11/23/93...
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*Contaq  . . . . . [no datasheets, some info]...
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*Intel...
**82489DX       Advanced Programmable Interrupt Controller    10/12/92
***Notes:...
***Info:...
***Versions:...
***Features:...
**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
***Notes:
Date source: TimelineDateSort7_05.pdf

Information taken from: 
            1995_Intel_Pentium_Processors_and_Related_Components.pdf*
                                         8249x Cache controllers.pdf**

>*  Datasheet dated Oct'93
>** 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.

This  chip was  used on  the Pentium  66MHz CPU  complexes of  Intel's
Xpress platform.   Specifically the  BXCPUPENT66 (Single  66MHz, eight
82491s) and BXCPU2XPENT (Dual 66 MHz,  eight 82491s). Also found on P5
60/66MHz CPU complexes of IBM 9595/PC Server 300/500 systems.

***Info:...
***Configurations:...
***Features:...
**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...
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