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**82420EX     PCIset (for 486) EX (Aries)   (82425EX/82426EX)   <Dec94
***Notes:...
***Info:
The  82420EX   PCIset  is  the  foundation  for   the  Value  Flexible
Motherboard  solution  for  entry-level Intel486  processor-based  PCI
systems. The  Value Flexible Motherboard  solution, including 82420EX,
Intel486  processor, 82091AA  Advanced  Integrated Peripherals,  82C42
Keyboard Controller, Flash BIOS, and  Plug & Play software, drives PCI
into  the  mainstream.  The  82420EX  PCIset  is  a highly  integrated
solution enabling low cost, small form factor motherboard designs. All
Intel486   processors  and  upgrades   are  supported,   including  L1
write-back  and Intel  SMM  power  management. PCI  Local  Bus IDE  is
incorporated for higher performance IDE at no additional cost.

The 82420EX  was designed from the  ground up for  PCI performance. It
consists of two  components - the 82425EX PCI  System Controller (PSC)
and  the 82426EX ISA  Bridge (IB).   The PSC  integrates the  L2 cache
controller and the DRAM controller. The cache controller supports both
write-through and  write-back cache policies  and cache sizes  from 64
KBytes   to  512   KBytes   in  an   interleaved  or   non-interleaved
configuration. The DRAM controller  interfaces main memory to the Host
Bus  and the PCI  Bus.  The  PSC supports  a two-way  interleaved DRAM
organization for optimum performance.  Up to ten single-sided SIMMs or
four double-sided and two single-sided  SIMMs provide a maximum of 128
MBytes of  main memory. The PSC  provides memory write  posting to PCI
for enhanced CPU-to-PCI memory write performance. In addition, the PSC
provides a high performance PCI Local Bus IDE interface.

The IB is the bridge between  the ISA Bus and Host Bus, and integrates
the common  I/O functions  found in today’s  ISA-based PC systems  - a
seven channel DMA controller, two 82C59 interrupt controllers, an 8254
timer/counter, Intel  SMM power management support,  and control logic
for NMI generation. The IB also provides the decode for external BIOS,
real time  clock, and  keyboard controller. Edge/Level  interrupts and
interrupt steering are supported  for PCI plug and play compatibility.
The  IB integrates the  ISA address  and data  path, reducing  TTL and
system cost.  In addition, the integration of  system clock generation
logic eliminates the need for external host and PCI clock drivers.

***Configurations:...
***Features:...
**82430LX     PCIset (Pentium) LX (Mercury) (82433LX/82434LX) 03/22/93...
**82430NX     PCIset (Pentium) NX (Neptune) (82433NX/82434NX)    Mar94...
**82430FX     PCIset (Pentium) FX (Triton I) (82437FX/82438FX)01/31/95...
**82430MX     PCIset (Pentium) MX (Mobile Triton)(82437/438MX)11/01/95...
**82430HX     PCIset (Pentium) HX (Triton II) (82439HX)       02/12/96...
**82430VX     PCIset (Pentium) VX (Triton II) (82437VX/82438) 02/12/96...
**82430TX     PCIset (Pentium) TX (Triton II) (82439TX)       02/17/97...
**82450KX/GX  PCIset (Pentium Pro) KX/GX (Mars/Orion)         11/01/95...
**
**Support Chips:
**82091AA     Advanced Interface Peripheral (AIP)                  c93...
**8289        Bus Arbiter (808x)                                   c79...
**82289       Bus Arbiter for iAPX 286 Processor Family            c83...
**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
***Notes:...
***Info:...
***Versions:...
***Features:...
**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
***Notes:...
***Info:...
***Versions:...
***Features:...
**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...
**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...
**
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**?????  (Profusion)    c:99...
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