Thread: SIS 486-471 Rev:G Motherboard User Manual

- also known as SIS 486-471 VL BUS 5/3.3Volt Ver:G
- BIOS ID string 08/18/95-SIS-85C471B/E/G-2C419F32-00
- 2-72 pin SIMM slots (1-128meg FPM DRAM)
- 4-30 pin SIMM slots
- 3-32bit VESA Local Bus slots
note: - 7-16bit ISA slots
- 64k-1024k CACHE support in 8-32pin sockets
- Award 1995 Auto-Detect BIOS.
- Green PC Connector
- SiS 85C471 chipset
- Supports 3.3v/5volt CPU's
- ZIF 237pin CPU socket 3 which supports these processors:
INTEL 80486SX/SX2,80486DX/DX2/DX4,P24D
CYRIX CX486S(M6),CX486DX(M7),CX486-V66/V80, 5X86-100GP
AMD DX2 66/80, AMD DX4-100, AMD DX4-120 W/T, AMD DX4-120 W/B
- Supports speeds of 20/25/33/40/50 MHz.
- Manufactured by: ? (unknown)


==View or Print jumper settings using Fixedsys or New Courier fonts==

SIS 486-471 VL BUS 5/3.3V Ver:G Motherboard

- BIOS ID string 08/18/95-SIS-85C471B/E/G-2C419F32-00
- 2-72 pin SIMM slots (1-128meg FPM DRAM)
- 4-30 pin SIMM slots
- 3-32bit VESA Local Bus slots
note: - 7-16bit ISA slots
- 64k-1024k CACHE support in 8-32pin sockets
- Award 1995 Auto-Detect BIOS.
- Green PC Connector
- SiS 85C471 chipset
- Supports 3.3v/5volt CPU's
- ZIF 237pin CPU socket 3 which supports these processors:
INTEL 80486SX/SX2,80486DX/DX2/DX4,P24D
CYRIX CX486S(M6),CX486DX(M7),CX486-V66/V80, 5X86-100GP
AMD DX2 66/80, AMD DX4-100, AMD DX4-120 W/T, AMD DX4-120 W/B
- Supports speeds of 20/25/33/40/50 MHz.
- Manufactured by: ? (unknown)
================================================== =====================
External Battery J1
TURBO switch disabled J6 1-2
TURBO switch enabled J6 2-3 (1-2-3 with Turbo switch)
TURBO used for break switch J6 4-5
CMOS normal JP38 1-2
CMOS clear JP38 2-3
Monitor EGA/VGA/Monochrome JP39 open
Monitor CGA JP39 closed
RC pin break switch enabled JP40 1-2
RC pin used for RC JP40 2-3
-----------------------------------------------
( these over-ride the CPU jumpers below )
CX486S2 CPU installed JP5 closed
P24D only JP4 closed
P24D only (pins 1-2) JP6 closed
-----------------------------------------------
================================================== =====================
Config Bank 0 Bank 1 Bank 2
--------------------------------------------------------------
1 (30pin) (30pins) no other slots
2 SIMM5,6,7,8 SIMM10 SIMM9
3 SIMM9 SIMM10 SIMM5,6,7,8
DRAM SLOT Select Config JP36 JP37
-----------------------------------------------------
30pin / 30pin 1 1-2 open
30pin / 72pin / 72pin 2 1-2 2-3
72pin / 72pin / 30pin 3 2-3 1-2
DRAM configurations indicate support for:
30pin simms 72pin simms
-----------------------------------
256k x 9 256k x 36
1M x 9 1M x 36
4M x 9 4M x 36
8M x 9 8M x 36
16M x 9 16M x 36
* note: 8meg 30pin simms only work with all 4 slots of BANK 0 filled
and one 8meg 72pin simm installed in BANK 1 (DRAM Config #2).
================================================== =====================
Cache Memory Configuration - Yellow (cache) and Red(tag) Jumper Caps
Cache Bank 0 Bank 1 TAG
---------------------------------------------------------
64K 4 - 8kx8 4 - 8kx8 1 - 4kx8
128K 4 - 32kx8 none 1 - 8kx8
256K 4 - 32kx8 4 - 32kx8 1 - 16kx8
256K 4 - 32kx8 4 - 32kx8 1 - 32kx8
512K 4 - 128kx8 none 1 - 32kx8
1024K 128k*8 128k*8 128k*8
Cache JP1 JP2 JP3 JP25 JP26 JP27 JP28 TAG SRAM
-----------------------------------------------------------------------
64K 1-2 2-3 2-3,4-5 1-2 1-2 1-2 open 8k*8-20
128K 2-3 1-2 1-2,3-4 2-3 1-2 1-2 open 8/16k*8-20
256K 2-3 2-3 2-3,4-5 2-3 2-3 1-2 open 32k*8-20
256K 2-3 2-3 2-3,4-5 1-2 open open closed 16k*8-20
512K 2-3 1-2 1-2,3-4 2-3 2-3 2-3 open 32k*8-20
1024K 2-3 2-3 2-3,4-5 2-3 2-3 2-3 open 128k*8-20
================================================== =====================
CPU Configuration - Green Jumper Caps
CPU Type JP4 JP5 JP6 JP7 JP8
-----------------------------------------------------------------
80486SX open open open 3-4 open
80486DX/DX2 open open open 1-2,3-4 open
80486DX4 open open open 1-2,3-4 2-3
CX486SX open open open 1-2 2-3
CX486DX/DX2 open open open 1-2,3-4 2-3
CX486DX2-V66 open open open 1-2,3-4 2-3
CX486DX2-V80 open open open 1-2,3-4 2-3
SLE486SX open open open 2-3 open
SLE486DX/DX2 open open open 1-2,3-4 open
P24D/CX 5X86-100GP open open 1-2 1-2,3-4 1-2
P24T open open open 1-2,3-4 1-2
CX486DX4-100P open open open 1-2,3-4 2-3
AMD DX4-100 open open open 1-2,3-4 open
AMD DX4-120 W/T open open open 1-2,3-4 open
AMD DX4-120 W/B open open open 1-2,3-4 1-2

CPU Type JP9 JP10 JP11 JP12 JP13 JP14 JP16 JP17
-------------------------------------------------------------------------
80486SX 2-3 1-2 open open open open open open
80486DX/DX2 2-3 1-2 open 3-4 open open open open
80486DX4 2-3 1-2 open 3-4 2-3 3-4 1-2 4-5
CX486SX 2-3 1-2 2-3 open 1-2,3-4 2-3,4-5 open 2-3
CX486DX/DX2 2-3 1-2 2-3 3-4 1-2,3-4 2-3 open 2-3
CX486DX2-V66 2-3 1-2 2-3 3-4 1-2,3-4 2-3 open 2-3
CX486DX2-V80 2-3 1-2 2-3 3-4 1-2,3-4 2-3 open 2-3
SLE486SX 2-3 1-2 open open 2-3 3-4 1-2 4-5
SLE486DX/DX2 2-3 1-2 open 3-4 2-3 3-4 1-2 4-5
P24D and
CX5X86-100GP 2-3 1-2 open 3-4 2-3 1-2,3-4 open 1-2
P24T 1-2 1-2 open 3-4 2-3 1-2,3-4 open 1-2
CX486DX4-100P 2-3 1-2 2-3 3-4 1-2,3-4 2-3 open 2-3
AMD DX4-100 2-3 2-3 3-4 1-2,3-4 open open open open
AMD DX4-120W/T 2-3 1-2 open 3-4 2-3 3-4 1-2 4-5
AMD DX4-120W/B 2-3 1-2 open 3-4 2-3 1-2,3-4 2-3 4-5
CPU Type JP18 JP19 JP33 JP34 JP41 JP42 JP43

80486SX closed 2-3 2-3 1-2 2-3,5-6 open open
80486DX/DX2 closed 2-3 2-3 1-2 2-3,5-6 open open
80486DX4 open 2-3 2-3 1-2 1-2,4-5 open open
CX486SX closed 2-3 1-2 2-3 2-3,5-6 open open
CX486DX/DX2 closed 2-3 1-2 2-3 2-3,5-6 open open
CX486DX2-V66 closed 2-3 1-2 2-3 1-2,4-5 closed open
CX486DX2-V80 closed 2-3 1-2 2-3 1-2,4-5 closed open
SLE486SX closed 2-3 2-3 1-2 2-3,5-6 open open
SLE486DX/DX2 closed 2-3 2-3 1-2 2-3,5-6 open open
P24D/CX 5X86-100GP closed 2-3 1-2 1-2 1-2,4-5 open open
P24T closed 2-3 1-2 1-2 2-3,5-6 open open
CX486DX4-100P closed 2-3 1-2 2-3 1-2,4-5 open open
AMD DX4-100 closed 2-3 1-2 2-3 1-2,4-5 open open
AMD DX4-120 W/T open 2-3 1-2 2-3 1-2,4-5 open open
AMD DX4-120 W/B closed 2-3 1-2 1-2 1-2,4-5 open open
================================================== =====================
CPU Speed for Clock Chips: U16-AVASEM, AV9107-03, KTS0147C
- Blue Jumper Caps
Speed JP22 JP23 JP24
------------------------------------------
20MHz closed open closed
25MHz closed closed open
33MHz open closed closed
40MHz closed open open
50MHz open open closed
CPU Speed for Clock Chip: U17-MX8315
Speed JP22 JP23 JP24
----------------------------------------
20MHz open open open
25MHz open closed open
33MHz closed closed closed
40MHz open closed closed
50MHz closed open open
================================================== =====================
CPU voltage JP41
-------------------------------
3.3 volts 1-2,4-5
5.0 volts 2-3,5-6
(note: if the voltage regulators Q4, Q5 and/or Q6 )
( are installed set JP41 to 1-2,4-5. )
Those are the various DX4 (3.3volt) voltage regulators. Q6 is usually the
only one used but I suppose the others might be found on older boards.
Q4 - part# IRF540 or IRF520
Q5 - part# 2N2222 or TO-92
Q6 - part# LT1085CT
================================================== =====================
VESA Wait States JP31
--------------------------------
0 wait state 1-2
1 wait state 2-3
CPU Speed JP32 (BUS SPEED)
-----------------------------------------
<= 33MHz 1-2
> 33MHz 2-3
================================================== =====================