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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...
**ACC2036 Single Chip Solution 2036 (286/386SX) <Jul92
***Info:...
***Configurations:...
***Features:
o 100% hardware and software compatible with the IBM PC/AT
o Fully compatible with
Intel 8237 DMA controller
Intel 8259 interrupt controller
Intel 8254 timer/counter
Intel 82284 clock generator
Intel 82288 bus controller
Tl 74L8612 memory mapper
ACC 82021 AT chipset
o Functions include
7 DMA channels
3 timer /counter channels
14 external interrupt channels
Advanced memory controller
Power management features
o Supports 286 and 3868X micro- processors with up to 33 MHz system
clock
o Supports 287 and 387SX coprocessors
o 4-way or 2-way page interleaved memory controller
o Direct Access Memory Controller
o Supports EMS 4.0
o Shadow RAM for BIOS and video
o Simultaneous EMS and shadow RAM
o Supports up to 512K EPROM
o Supports single 8-bit EPROM
o Supports 64Kx1, 256Kx1, 256Kx4, 1Mx1, 1Mx4, 4M x1 DRAM memories up
to 16 MB
o Supports up to 8 banks of Memory
o Supports mixed type of DRAM memories from one bank to another
o On board 128K-64oK RAM can be disabled
o Speed change via hardware or software
o Supports dynamic remapping of 640K through 1M memory range
o Supports pipelined mode operation
o Programmable wait states for ROM
o Built-in bus conversion logic for 16-bit to 8-bit transfers
o Quick software switch from protected mode to real mode for OS/2
optimization
o Programmable I/O address decoder
o Supports standby mode operation at as low as 1MHz
o Power-saving features:
Selectable operating frequency.
Unused RAS lines can be shutoff.
Optional slow DRAM refresh.
Detect video display activities.
CLKSER and CLK8042 can be shut off.
o Data and address buffers
o Parity bit can be disabled
o 1.0/0.8 micron high performance CMOS technology
o 208-pin PQFP package
**ACC2046/ST 486DX/486SX/386DX Single Chip AT <Jul92...
**ACC2048 WB 486 Notebook/Embedded Single Chip [no datasheet] ?...
**ACC2051/NT PCI Single Chip Solution for Notebook Applications c96...
**ACC2056 ?Pentium 3.3V Notebook [no datasheet]<Jan96...
**ACC2057 PCI Notebook/Embedded Single Chip [no datasheet]<Aug96...
**ACC2066NT 486 Notebook/Embedded Single Chip [no datasheet] ?...
**ACC2086 486 VL-based System Super Chip Soluti[no datasheet] ?...
**ACC2087 Enhanced Super Chip (486 Single Chip) <Aug96...
**ACC2089 486 PCI-based System Super Chip [no datasheet] ?...
**ACC2168/GT 32-bit 486 Green System Single Chip [no datasheet] ?...
**ACC2178A 32-bit 486 Green System Single Chip [no datasheet] ?...
**ACC2268 ?486 [no datasheet] ?...
**ACC???? Maple/Maple-133 486-System-On-Chip [no datasheet] ?...
**
**Support Chips:
**ACC2016 Buffer and MUX Logic c96...
**ACC2020 Power Management Chip c92...
**ACC5500 Multifunction I/O Control Chip for PS2 Model 50/60 c88...
**
**Other chips
ACC1200 Clock synthesizer Supports Pentium-Pro and Pentium-class PCI
ACC16C451 Multi I/O 1x16450/1xLPT
ACC16C452 Multi I/O 2x16450/1xLPT
ACC16C461 Multi I/O 1x16450/1xLPT
ACC2042 Keyboard/Mouse Controller
ACC2188 PCI bus controller Support 32-bit PCI Bus interface with built-in power management control and synchronous / asynchronous clock feature.
ACC3201 PC/XT/AT FDD Controller
ACC3202 PS/2 FDD Controller
ACC3203 PS/2 FDD Controller
ACC3211 PC AT/XT FDD Controller (x4) + with IDE
ACC3221 Multi I/O Controller, floppy/IDE/2x16450/1xLPT
ACC3223 Multi I/O Controller, floppy/IDE/2x16550/1xLPT
ACC3350 Ultra SCSI
ACC3360 UltraWide SCSI
ACC3618 3D surround controller ISA
ACC5810 Micro Channel Interface Chip
ACC808 Plug-and-Play Controller
ACC???? Manhattan PCI-based FireWire for Pentium
ACC???? Memphis PCI-based CardBus and FireWire
*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...
**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...
**800 series...
*Headland/G2...
*HMC (Hulon Microelectronics)...
*Logicstar...
*Motorola...
*OPTi...
*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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