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**82289       Bus Arbiter for iAPX 286 Processor Family            c83
***Info:...
***Info:
The Intel  M82289 Bus Arbiter is  a 5-volt, 20-pin  HMOS III component
for use in  multiple bus master M80286 systems.  The M82289 provides a
compact solution to system bus arbitration for the M80286 CPU.

The complete IEEE 796 Standard  bus arbitration protocol is supported.
Three modes  of bus release  operation support  a number of  bus usage
models.

FUNCTIONAL DESCRIPTION

The M82289 Bus Arbiter in  conjunction with the M82C288 Bus Controller
and the M82C284 Clock Generator interface the M80286 processor or some
other bus master to a multi-master system bus. The arbiter multiplexes
a processor onto a multi-master  system bus. It avoids contention with
other bus masters.

The M82289 has  two separate state machines  which communicate through
bus request and  release logic. The processor  interface state machine
is synchronous with the local  system clock (CLK) and the multi-master
system bus interface  state machine is synchronous with  the bus clock
(BCLK).

The M82289  performs all signal  ling to request, obtain,  and release
the system bus.  External logic is  used to determine which bus cycles
require  the system  bus  and th  resolve  priorities of  simultaneous
requests for control of the system bus.

***Versions:...
***Features:...
**82258       Advanced Direct Memory Access Coprocessor(ADMA) 01/01/84...
**82335       High-Integration Interface Device For 386SX      c:Nov88...
**82360SL     I/O Subsystem                                   10/05/90...
**82370       Integrated System Peripheral (for 82376)         c:Oct88...
**82371FB/SB  PCI ISA IDE Xcelerator 82371FB/82371SB (PIIX/3) 01/31/95...
**82371MX     Mobile PCI I/O IDE Xcelerator (MPIIX)           11/01/95...
**82371AB     PCI-TO-ISA / IDE Xcelerator 82371AB (PIIX4)     02/17/97...
**82374/82375 PCI-EISA Bridge (82374EB/82375EB, 374SB/375SB)   c:Mar93...
**82378       System I/O (SIO) (82378IB and 82378ZB)           c:Mar93...
**82379AB     System I/O-APIC (SIO.A)                           <Dec94...
**82380       32-bit DMA Controller w/ Integrated Peripherals 02/01/87...
**82380FB/AB  PCIset: 82380FB Mobile PCI-to-PCI Bridge(MPCI2) 02/17/97...
**82384       Clock Generator and Reset Interface                  c86...
**82385       32-bit Cache Controller for 80386               09/29/87...
**82385SX     32-bit Cache Controller for 80386SX             01/25/89...
**82395DX     High Performance Smart Cache                    06/18/90...
**82395SX     Smart Cache                                     12/17/90...
**82396SX     Smart Cache                                     12/17/90...
**82485       Turbo Cache (and 485Turbocache)                      c90...
**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...
**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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*UMC...
**UM82C230     286AT MORTAR Chip Set                               <91
***Info:...
***Configurations:...
***Features:
o   Fully PC/AT-Compatible for 10MHz and 12MHz systems.
o   Guaranteed zero wait state for 80ns DRAMs at 12MHz and one wait 
    state for 120ns DRAMs at 12.5MHz.
o   Supports up to 4MB local memory on board.
o   Remaps 384KB of top of system local memory space.
o   Supports 1M/256K SIM module.
o   Supports 12MHz operation with one wait state for 200ns EPROM.
o   Commercially available BIOS (Phoenix/Award/AMI) applicable.
o   Easy design system board, three VLSI chips and eight TTLs 
    configure all the logic.
o   Landmark speed=15.9MHz operating at 12MHz, 16.5MHz operating at
    12.5MHz.

**UM82C210     386SX/286 AT Chip Set                               <91...
**UM82C3xx     Twinstar & UM82C336F/N & UM82C39x [no datasheet]      ?...
**UM82C380     386 HEAT PC/AT Chip Set                             <91...
**UM82C480     386/486 PC Chip Set                                 c91...
**UM82C493/491 ??????????????? [no datasheet]                        ?...
**UM8498/8496  486 VL Chipset  "Super Energy Star Green"[no dsheet]c94...
**UM8881/8886  HB4 PCI Chipset "Super Energy Star Green"[no dsheet]c94...
**UM8890       Pentium chipset [no datasheet]                        ?...
**
**Support Chips:
**UM82152      Cache Controller (AUStek A38152 clone)              <91...
**UM82C852     Multi I/O For XT                                    <91...
**UM82C206     Integrated Peripheral Controller                    <91...
**UM82c45x     Serial/Parallel chips                                 ?...
**Other chips:...
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