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**A note on VESA support of 486 chipsets.
Many chipsets state that they support VESA local bus. In some cases
these actually implement VLB somewhat like PCI, where it is entirly
decoupled from the CPU bus. Chipsets that do not state they work with
VLB, may be found on motherboards that contain VLB slots. VLB
is *basically* The 486 CPU pinout in a slot form. Unless these
m/boards contain some additional chips, there VLB implementation is
directly coupled to the CPU.
**Datasheets:...
*_IBM...
*ACC Micro...
*ALD...
*ALi...
*AMD . . . . . . . [no datasheets, some info]...
*Chips & Technologies...
*Contaq . . . . . [no datasheets, some info]...
*Efar Microsystems [no datasheets, some info]...
*ETEQ...
*Faraday...
*Forex . . . . . . [List only, no datasheets found]...
*Intel...
**82485 Turbo Cache (and 485Turbocache) c90
***Notes:...
***Info:...
***Versions:...
***Features:...
**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...
**800 series...
*Headland/G2...
*HMC (Hulon Microelectronics)...
*Logicstar...
*Motorola...
*OPTi...
**82C556/7/8N Viper-N Viper Notebook Chipset <05/25/95
***Notes:...
***Info:...
***Configurations:...
***Features:
CPU Interface
o Fully supports Intel’s 3.3V Pentium Processor and dual processor
configuration at 50, 60, and 66.667MHz
o Supports P54C, P55C, K5, and M1 processors
o Supports the Cyrix M1 Processor linear burst mode
o Three chip solution:
- 82C556 DBC (Data Buffer Controller) in a 160-pin PQFP (Plastic
Quad Flat Pack) or 176-pin TQFP (Thin Quad Flat Pack)
- 82C557 SYSC (System Controller) in a 208-pin PQFP or TQFP
- 82C558N IPC (Integrated Peripherals Controller) in a 208-pin
PQFP or TQFP
o Supports CPU address pipelining
Cache Interface
o Write-back/write-through, direct-mapped cache with size
selections: 64KB, 128KB, 256KB, 1MB and 2MB
o Support for synchronous and asynchronous SRAMs, pipelined sync-
hronous SRAMs, and Intel standard BSRAMs (BiCMOS SRAMs)
o Support for the Sony SONIC-ZWPT Cache Module
o Programmable cache write policy:
- Write-back
- Write-through
- Adaptive write-back
o Built-in tag auto-invalidation circuitry
o Fully programmable 3-2-2-2 asynchronous cache burst read/Write
cycles, 3-1-1-1/2-1-1-1 burst read/write support at 66/50MHz
o Options for cacheable, write protected. system and video BIOS
DRAM Interface
o Supports six banks of 64-bit wide DRAMs with 256KB, 512KB. 1MB,
2MB, 4MB, 8MB and 16MB addressing page mode DRAMs
o Supports DRAM configurations up to 512MB
o Supports 3-3-3-3 pipelined DRAM burst cycles
o 64-bit DRAM post write buffer
o Programmable drive currents for the DRAM control signals
o Hidden refresh with CAS-before-RAS refresh supported
o Support for two programmable non-cacheable memory regions
PCI Interface
o Interfaces the CPU and standard buses to both Peripheral Component
Interconnect (PCI) and VL bus operating in synchronous/async-
hronous modes, with VL bus always running at PCI bus operating
frequency
o Supports three PCI masters, one VL slave, and six ISA peripherals
o Supports PCI pre-snoop for PCI masters
o PCI byte/word merge support for CPU accesses to PCI bus,‘ and
support for PCI pre-fetch
o Burst mode PCI accesses to local memory supported
Miscellaneous
o Integrated two drive VL-based IDE controller
o Self-refresh supported during Suspend mode
o Support for flash ROM
o Shadow RAM option
o Transparent 8042 emulation for fast CPU reset and Gate A20
generation
o Supports Port 092h, fast Gate A20 and fast reset
o Includes a fully integrated 82C206 with external real-time clock
(RTC) interface
**82C556M/7M/8E Viper-N+ Viper Notebook Chipset c:96...
**82C566/7/8 Viper-Max Chipset Scalable MultiMedia PC Solution ?...
**82C571/572 486/Pentium c:93...
**82C576/7/8 Viper Xpress [no datasheet] ?...
**82C576/8/9 Viper XPress+ [no datasheet, some info] <01/16/97...
**82C596/597 PTMAWB Pentium Adaptive Write-back (Cobra) c:93...
**82C650/1/2 Discovery (Pentium Pro) [no datasheet] ?...
**82C681/2/6/7 386/486WB EISA c:92...
**82C683 386/486AWB EISA [no datasheet] ?...
**82C693/6/7 Pentium uP Write Back Cache EISA c:93...
**82C700 FireStar c:97...
**82C701 FireStar Plus c:97...
**82C750 Vendetta [no datasheet] ?...
**82c801 SCWB2 DX Single Chip Solution c:92...
**82C802 SCWB2 PC/AT Single Chip [no datasheet] ?...
**82C802G/GP System/Power Management Controller (cached) c:93...
**82C895 System/Power Management Controller (cached) c:Sep94...
**82C898 System/Power Management Controller (non-cache)c:Nov94...
**
**Support Chips:
**82C601/2 Buffer Devices <Nov94...
**82C822 PCIB (VLB-to-PCI bridge) c:94...
**Other:...
*PC CHIPS/Amptron/Atrend/ECS/Elpina/etc...
*SIS...
*Symphony...
*TI (Texas Instruments)...
*UMC...
*Unresearched:...
*VIA...
*VLSI...
*Western Digital...
*Winbond...
*ZyMOS...
*General Sources:...
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