==View or Print jumper settings using Fixedsys or New Courier fonts==
SIS 486-471 VL BUS 5/3.3Volt Rev:A Motherboard
- 2-72 pin SIMM slots (1-128MEG FPM DRAM)
- 4-30 pin SIMM slots
- 3-32bit VESA Local Bus slots
note: - 6-16bit ISA slots
note: - 1-8bit ISA slot
- 64k-512k CACHE support in 8-28pin sockets
- AMI 199??? 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)
SLE486SX,SLE486DX/DX2
- Supports speeds of 20/25/33/40/50/66 MHz.
- Manufactured by: VISION TECHNOLOGIES (now defuncted)
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External Battery J1
TURBO switch enabled J3 1-2
TURBO switch disabled J3 2-3
TURBO used for break switch J3 4-5
CMOS normal JP16 1-2
CMOS clear JP16 2-3
Monitor EGA/VGA/Monochrome JP17 open
Monitor CGA JP17 closed
RC pin break switch enabled JP19 1-2
RC pin used for RC JP19 2-3
CX486S2 CPU installed JP18 closed
CX486S2 not installed JP18 open
=======================================================================
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 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
Cache JP1 JP2 JP3 JP4 JP33 JP34 JP35
----------------------------------------------------------------------
64K 2-3 1-2 2-3,4-5 1-2 1-2 1-2 open
128K 1-2 1-2 1-2,3-4 1-2 2-3 2-3 open
256K 2-3 open 2-3,4-5 open 2-3 2-3 closed
256K 2-3 2-3 2-3,4-5 1-2 2-3 2-3 open
512K 1-2 2-3 1-2,3-4 2-3 2-3 2-3 open
=======================================================================
CPU Type JP30 JP31
-------------------------------
P24D closed closed
All others open open
=======================================================================
CPU Type JP8 JP9 JP10 JP11 JP12
--------------------------------------------------------
80486SX 2-3 open 2-3 open open
80486DX 1-2 closed 2-3 3-4 open
80486DX4 1-2 closed 2-3 3-4 3-4
CX486SX 2-3 closed 2-3 open 2-3,4-5
CX486DX 1-2 closed 2-3 3-4 2-3
SLE486SX 2-3 open 2-3 open 3-4
SLE486DX 1-2 closed 2-3 3-4 3-4
SLE486DX2 1-2 closed 2-3 3-4 3-4
P24D 1-2 closed 1-2 3-4 1-2,3-4
P24T 1-2 closed 1-2 2-3 3-4
CPU Type JP13 JP14 JP15 JP21 JP22
--------------------------------------------------------
80486SX open open open 2-3 1-2
80486DX open open open 2-3 1-2
80486DX4 1-2 2-3 4-5 2-3 1-2
CX486SX open 1-2,3-4 2-3 1-2 2-3
CX486DX open 1-2,3-4 2-3 1-2 2-3
SLE486SX 1-2 2-3 4-5 2-3 1-2
SLE486DX 1-2 2-3 4-5 2-3 1-2
SLE486DX2 1-2 2-3 4-5 2-3 1-2
P24D 2-3 2-3 4-5 2-3 1-2
P24T open 2-3 1-2 1-2 1-2
CPU Type JP24 JP25 JP32 JP41 JP42
--------------------------------------------------------
80486SX open open 1-2 2-3,5-6 closed
80486DX open open 1-2 2-3,5-6 closed
80486DX4 open open 2-3 1-2,4-5 open
CX486SX 2-3 2-3 2-3 2-3,5-6 closed
CX486DX 2-3 2-3 2-3 2-3,5-6 closed
SLE486SX open open 2-3 2-3,5-6 closed
SLE486DX open open 2-3 2-3,5-6 closed
SLE486DX2 open open 2-3 2-3,5-6 closed
P24D open 1-2 2-3 2-3,5-6 closed
P24T 1-2 1-2 2-3 2-3,5-6 closed
=======================================================================
CPU Speed for Clock Chips: U16-AVASEM, AV9107-03, KTS0147C
Speed JP5 JP6 JP7
-------------------------------------
20MHz closed open closed
25MHz closed closed open
33MHz open closed closed
40MHz closed open open
50iMHz closed closed open
50MHz open open closed
66iMHz open closed closed
CPU Speed for Clock Chip: U17-MX8315
Speed JP5 JP6 JP7
-------------------------------------
20MHz open open open
25MHz open closed open
33MHz closed closed closed
40MHz open closed closed
50iMHz open closed open
50MHz closed open open
66iMHz closed closed closed
=======================================================================
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 JP28
--------------------------------
0 wait state 1-2
1 wait state 2-3
CPU Speed JP29 (BUS SPEED)
-----------------------------------------
<= 33MHz 1-2
> 33MHz 2-3
=======================================================================
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