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**82C735   I/O Peripheral Controller With Printgine            c:Jul93
***Info:
The CHIPS  82C735 enhanced I/O peripheral controller  is a single-chip
solution  offering  complete  I/O  capabilities for  PC/AT  and  PC/XT
motherboard   applications.   The   controller   is   configured   via
software. The 82C735 features a floppy disk controller, a digital data
separator,  two  16550  compatible  UARTs, an  enhanced  bidirectional
parallel port interface called Printgine, IDE interface control logic,
and  a  game port  chip  select.   For  more information  about  these
systems, see the Functional Description [see datasheet].

4MB FLOPPY DISK CONTROLLER
The floppy disk controller is  software compatible with 765B and 82077
controller functions. It provides a 4MB perpendicular recording format
as well as the standard floppy drive format for 5.25-inch and 3.5-inch
media.  The controller  supports two  drives directly  and up  to four
drives with an external decoder.

DIGITAL DATA SEPARATOR
The digital  data separator  is capable of  data transfer rates  up to
1MB/sec and requires no external components.

NS16550 UARTS AND IDE
The two  licensed NS16550 UARTs  are improved versions of  the NS16450
UARTs. They are provided with  individual 16-byte FIFOs to relieve the
CPU of  excessive software overhead  and are still capable  of running
existing 16450 software.

The IDE control  logic provides a complete IDE  interface for embedded
hard disk drives.

MOUSE PORT LOGIC
The 82C735  controller features optional  PS/2 style mouse  port logic
with BIOS and  driver support. Only one of the UARTs  can be used when
the mouse is operational.

PRINTGINE PARALLEL PORT INTERFACE
The parallel  port interface, Printgine, is  a multiprotocol interface
capable of  supporting both unidirectional  and bidirectional transfer
modes. It is fully compatible with ISA and PS/2 in the standard modes,
and  also supports  Microsoft ECP,  EPP,  and fast  Centronics in  the
enhanced  modes. The  output  on  the control  pins  switch to  become
bidirectional TTL drivers  in the fast modes. This  makes the port run
faster than is  possible with the open-drain drivers  provided for the
standard modes.

Printgine provides an economical mechanism for significantly improving
the throughput of an improved  parallel port that is upward compatible
with the  existing parallel  port. The interface  can operate  in five
different   modes:    standard   (ISA-style   unidirectional),   bi-di
(PS/2-style   bidirectional),    Microsoft   ECP,   EPP,    and   fast
Centronics. The standard and  bi-di modes are compatible with existing
parallel port protocols.

The ECP, EPP, and fast Centronics protocols are enhanced bidirectional
modes that achieve dramatic  improvement by implementing the protocols
in hardware.  The fast Centronics mode  is capable of  a data transfer
rate of  200KB/sec, while the  ECP and EPP  modes are capable  of data
transfer rates of 2MB/sec, compared to 15KB/sec in the standard mode.

POWER MANAGEMENT
The 82C735 is provided with several power management features that are
controllable through  hardware or  software.  In hardware,  the device
can be completely powered down  through a powerdown 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.


***Versions:...
***Features:...
**82C835   Single CHIP 386sx AT Cache Controller               c:Apr91...
**F87000   Multi-Mode Peripheral Chip                         11/23/93...
**Other:...
**Disk:...
**Video:...
*Contaq  . . . . . [no datasheets, some info]...
*Efar Microsystems [no datasheets, some info]...
*ETEQ...
*Faraday...
*Forex . . . . . . [List only, no datasheets found]...
*Intel...
**82495XP/490XP Cache Controller / Cache RAM (for i860)       06/05/91
***Notes:...
***Info:...
***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:
***440FX (Natoma)       05/06/96...
***440LX (Balboa)       08/27/97...
***440BX (Seattle)      c:Apr'98...
***440DX (?)            c:?...
***440EX (?)            c:Apr'98...
***440GX (Marlinespike) 06/29/98...
***440ZX & 440ZX-66 (?) 01/04/99...
***440ZX-M (?)          05/17/99...
***440MX (Banister)     05/17/99...
**450NX  (?)            06/29/98:
Chips:
[82454NX] (PXB) [82453NX] (MUX) 
[82452NX] (RCG) [82451NX] (MIOC) 
[82371EB] (PIIX4E),                            
CPUs:          Single/Dual/Quad P-II Xeon/P-III Xeon
DRAM Types:    FPM EDO 2-way Interleave 4-way Interleave
Mem Rows:      8
DRAM Density:  16Mbit 64Mbit
Max Mem:       8GB
ECC/Parity:    Both
AGP speed:     N/A
Bus Speed:     100
PCI Clock/Bus: 1/3


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