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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]...
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*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...
**Other:
OPTi 82C200  - ChromaCast LCD-VGA chipset
OPTi 82C205  - LCD panel controller / scalar
OPTi 82C264  - 2D VGA controller
OPTi 82C265  - Video ????????????????????????????
OPTi 82C268  - Video ????????????????????????????
OPTi 82C611  - EIDE VLB
OPTi 82C611A - EIDE VLB
OPTi 82C621  - PCI-to-IDE controller
OPTi 82C621A - PCI-to-IDE controller 
OPTi 82C824  - FireFox PCI to PCMCIA Controller
OPTi 82C825  - FireBridge II PCI to PCMCIA Controller
OPTi 82C814  - Docking Station Controller for laptops (PCI-to-PCI bridge)
OPTi 82C842  - PCI-to-IEEE 1393 FireWire
OPTi 82C832  - ?????????????????????????????????????????
OPTi 82C861  - PCI-to-USB Bridge   c1997
OPTi 82C862  - PCI-to-USB Bridge 4x port
OPTi 82C863  - PCI-to-USB Bridge 2x port
OPTi 82C871  - PCI-to-USB Bridge + Sound Blaster compatibility and USB 2.0
OPTi 82C916  - Audio, ISA, serial CODEC) used in combination with Vendetta chipset 82C750
OPTi 82C924  - Audio, ISA
OPTi 82C925  - ISA Audio Controller (replaces the 924)
OPTi 82C928  - (MAD16) ISA Audio Controller (Emulates Sound Blaster Pro) c1993
OPTi 82C929  - (MAD16 Pro) ISA Audio Controller (Emulates Sound Blaster Pro) c1994
OPTi 82C930  - ISA Audio Controller (Emulates Sound Blaster Pro, AdLib)
OPTi 82C931  - ISA Audio controller (Emulates Sound Blaster Pro, AdLib)
OPTi 82C933  - Audio ?????????????????????????????
OPTi 82C935  - EV1935 ECTIVA MachOne PCI Audio
OPTi 82C941  - Wavetable chip, has something to do with 82C930
OPTi 82C950  - (MAD32) Audio/Modem controller (Emulates Sound Blaster Pro) c1994
OPTi 92C160  - Clock Generator for 92C168
OPTi 92C168  - LCD VGA controller c1993
OPTi 92C178  - LCD VGA controller with blt c1993
OPTi 92C264  - 2D VGA controller 

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