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**CS4021   ISA/486                  (84021/84025)                  c92
***Info: 
The  4021 two-chip  CHIPSet  with CPU  is  designed for  use in  PC/AT
systems.  It  is 100 percent  compatible with 486DX, 486DX2  486SX, or
386DX processors  or Super386 CPUs without any  component changes. The
performance  to cost  ratio is  optimized  for each  CPU option.  This
design allows  the system designer flexibility and  produces an easily
upgradable system.

The 4021 provides  a low cost high-performance  non-cache solution for
486SX systems.  it offers maximum performance benefits through the use
of a CHIPS-patented page interleaving algorithm.

The  4021  CHIPSet  architecture  provides an  alternate,  faster  and
efficient bus interface for speed-sensitive devices like video, disks,
or networks.   This is to overcome  the bus speed bottlenecks  such as
those  associated  with  EISA/ISA  systems  that  can  degrade  system
performance.

***Configurations:...
***Features:
o   Supports 486DX, 486DX2, 486SX, and Super386 CPUs
o   Supports 487 and 4167 in 486 CPU mode and 367, 3167 in 386 CPU 
    mode.
o   SuperState V support for the Super38605
o   Burst Mode support in cache and DRAM modes
o   Zero wait state Weitek support
o   64K, 128K, 256K, and 512K cache size
o   Direct-mapped, write back operation, with pipeline allocate on 
    read miss
o   Internal tag comparator
o   Zero wait state writes
o   2-1-1-1 burst for cache reads to the 486 and 486SX
o   Two-way interleaved data RAMs
o   Posted writes to DRAM
o   3-1-1-1 burst read with 486SX CPU at 20MHz with no cache
o   256K, 1M, and 4M deep DRAM support
o   Supports 4Mx4 DRAMs with 12/10 or 11/11 addressing
o   Support for 9-bit DRAM SIMS or 36-bit DRAM SIMMs
o   Page mode RAM access with option of using page interleaving
o   Up to 8 banks of 36-bit DRAMs
o   CAS before RAS refresh for low power consumption
o   Option of using asynchronous or synchronous AT clock source
o   Classic, hidden, or disabled refresh
o   Fast 12MHz AT bus support
o   Dual-ported VRAM interface
o   Local bus master and slave support

**CS4031   CHIPSet                  (84031/84035)              5/10/93...
**CS4041/5 CHIPSet                  (84041/84045)              2/10/95...
**CB8291   ELEAT                    [no datasheet]                 c90...
**CB8295   ELEATsx                  [no datasheet]                 c90...
**82C100   IBM PS/2 Model 30/Super XT                                ?...
**82C110   IBM PS/2 Model 30/Super XT                                ?...
**82C235   Single Chip AT (SCAT)                                   c89...
**82C836   Single Chip 386sx (SCATsx)                              <91...
**F8680/A  PC/CHIP Single-Chip PC                                  c93...
**
**Support Chips:
**64200    (Wingine) High Performance 'Windows Engine'         c:Oct91...
**82C206   Integrated Peripheral Controller                        c86...
**82C601/A Single Chip Peripheral Controller                 <08/30/90...
**82C607   Multifunction Controller                             <Jun88...
**82C710   Universal Peripheral Controller                     c:Aug90...
**82C711   Universal Peripheral Controller II                  c:Jan91...
**82C712   Universal Peripheral Controller II                  c:Jan91...
**82C721   Universal Peripheral Controller III                 c:May93...
**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:...
**Disk:...
**Video:...
*Contaq  . . . . . [no datasheets, some info]...
*Efar Microsystems [no datasheets, some info]...
*ETEQ...
*Faraday...
*Forex . . . . . . [List only, no datasheets found]...
*Intel...
**82395SX     Smart Cache                                     12/17/90
***Notes:...
**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...
**
**Later chipsets (basic spec):
**440 series:...
**450NX  (?)            06/29/98:...
**?????  (Profusion)    c:99...
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