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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:...
**CS4031   CHIPSet                  (84031/84035)              5/10/93...
**CS4041/5 CHIPSet                  (84041/84045)              2/10/95
***Info:...
***Configurations:...
***Features:
o   Local Bus
    - VESA  Local Bus 2.0 Compatible
    - Full L1 Write Back Cache Support
    - Up to 3 LDEV#s and 3 sets of LREQ# / LGNT# pairs provided 
      directly
    - Read and write bursting from VL Masters supported
o   DRAM Controller
    - 8 banks of DRAMs supported (4 double banks SIMMs, etc.)
    - Page mode and page interleave
    - 256K, 1M, 4M, and 16M deep DRAMs supported
    - Direct Drive RAS
    - Direct drive CAS, DWE, and MA for up to 36 DRAM chips
    - Hidden refresh with staggered RAS
    - SMM memory support
    - Variety of timing modes for system optimization
o   Cache Controller
    - Direct mapped, external tag, internal comparator
    - 16 byte line size
    - 64K, 128K, 256K, 512K or 1M size
    - Write back or Write through
    - Single bank or dual bank (word interleaved) cache
    - Multiple timing modes supported for cost performance tradeoff
o   Power Management
    - SMI support
    - Many power management features can be utilized without SMI
    - Internal Clock switching and stopping
    - Intel, AMD, and Cyrix support
    - Event monitoring
    - I/O restart capability
o   Integrated Local Bus IDE
    - Requires only 3 TTL
    - Support for 8 drives (4 connectors)
    - Data port accesses accelerated via local bus accesses
    - Timing modes selectable for each drive
o   Keyboard Controller
    - Integrated state machine based keyboard controller
    - Mouse port included
    - Keylock input provided on a multifunction pin

**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:...
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**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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