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**82C721   Universal Peripheral Controller III                 c:May93
***Info:
The CHIPS  82C721 enhanced I/O peripheral controller  is a single-chip
solution  offering  complete  I/O  capabilities for  PC/AT  and  PC/XT
environments.  The  82C721   supports  motherboard  applications  with
configuration via software.

The  82C721  features  a   floppy  disk  controller,  a  digital  data
separator, two 16450 compatible UARTs, a bi-directional parallel port,
an IDE interface control logic and a game port chip select.

The floppy  disk controller is software compatible  with NEC uPD72065B
floppy  disk controller.  The  controller supports  up to  four drives
directly. The digital data separator is capable of data transfer rates
up to 500kb/sec and requires no external components.

The 82C721 has two UARTs  which are compatible with NS16450 UARTs. The
IDE control logic provides a  complete IDE interface for embedded hard
disk  drives.  The  bidirectional  parallel  port  maintains  complete
compatibility with ISA and PS/2  parallel ports.  It can be configured
for either output mode or for bidirectional mode.

The  configuration   RAM  and  circuitry   support  programmable  base
addresses for  all the registers. Selection of  sources of interrupts,
enabling and configuring of on-chip  subsystems and the control of the
configuration  process itself  are also  handled by  this RAM  and its
associated circuitry.  The game port chip select provides a predefined
I/O address decode for games and joy stick applications.

The 82C721,  designed for  motherboard applications, is  provided with
several  power  management features,  which  are controllable  through
hardware  or  software. In  hardware,  the  device  can be  completely
powered down through  a power-down pin.  In this  mode, all inputs are
disabled, all outputs are inactive,  and the contents of all registers
are  preserved  (as long  as  the  power  supply is  maintained).   In
software,   the  device   allows  each   port  to   be   powered  down
independently.

The  82C721 features 24mA  drivers for  output buffers,  including the
host  data bus  and  the parallel  port  data bus.  The floppy  output
drivers  are  capable  of  sinking  48mA. The  host  interface  is  PC
compatible and can be connected directly to the ISA bus.

***Versions:...
***Features:...
**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...
**Other:...
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*Contaq  . . . . . [no datasheets, some info]...
*Efar Microsystems [no datasheets, some info]...
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*Faraday...
*Forex . . . . . . [List only, no datasheets found]...
*Intel...
**?????  (Profusion)    c:99
Chips:         
Memory Access Controller (MAC)  
Data Interface Buffer (DIB)
CPUs:          8x P-III Xeon Oct
DRAM Types:    SDRAM PC100 2-way Interleave dual channel
Max Mem:       32GB
ECC/Parity:    ECC
AGP speed:     N/A
Bus Speed:     100
PCI Clock/Bus: 1/3 PCI-66/64



**800 series...
*Headland/G2...
*HMC (Hulon Microelectronics)...
*Logicstar...
*Motorola...
*OPTi...
**82C281/282     Cache Sx/AT         (386SX)                 <08/22/91
***Notes:...
***Info:...
***Configurations:...
***Features:...
**82C283         386SX System Controller                          c:91...
**82C291         SXWB PC/AT Chipset  (386SX)                      c:91...
**82C295         SLCWB PC/AT Chipset (386SX)                         ?...
**82C381/382     HiD/386             (386DX)                      c:89...
**82C391/392     386WB PC/AT Chipset (386DX)                    <Dec90...
**82C461/462     Notebook PC/AT chipset [no datasheet]               ?...
**82c463         SCNB Single Ship Notebook                        c:92...
**82c465MV/A/B   Single-Chip Mixed Voltage Notebook Solution    <Oct97...
**82C481?/482?   HiP/486 & HiB/486 [no datasheet]                Oct89...
**82C491/392     486WB PC/AT Chipset                         <04/21/91...
**82C493/392     486SXWB                                     <10/21/91...
**82C495SX/392SX LCWB PC/AT chipset [no datasheet]                   ?...
**82C495SLC      DXSLC 386/486 Low Cost Write Back                c:92...
**82C495XLC      PC/AT Chip Set                                   c:93...
**82c496A/B      DXBB PC/AT Chipset                             <Mar92...
**82C496/7       DXBB PC/AT Chipset (Cached)                 <01/16/92...
**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
***Notes:...
***Info:...
***Configurations:...
***Features:...
**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...
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