486 MOTHERBOARD SA486VP rev 1.0

- 4 PCI slots (1 shared), 5 ISA 16-bit slots (2 with VESA LocalBus).
- 4 SIMM slots 72pin.
- Intel Saturn chipset.
- PHOENIX ROM BIOS (A74340).
- Press Ctrl-Alt-S after memory test to access SETUP-program.

 .------JP1,2,3--JP4,5,6---------------------.
 |...JP21  ::::  ::::    P1.  ##     |KB|    |
 |#   #   #   #   #               +++++++++++|
 |#   #   #   #   #                 .-------.|
 |#   #   #   #   #  #   #   #   #  |72pin| ||
 |#   #   #   #   #  1   2   3   4  |S|I|M|M||
 |#   #   #   #   #  #   #   #   #  | | | | ||
 |#   #   #   #   #  #   #   #   #  |1|2|3|4||
 |                   #   #   #   #  | | | | ||
 |#   #   #   #   #  #   #   #   #  | | | | ||
 |#   #   #   #   #  #   #   #   #  | | | | ||
 |#   #   #   #   #            JP9: | | | | ||
 |#   #   #   #   #            JP8: `-------´|
 |       .----.     JP11...                  |
 |#   #  |    |                              |
 |#   #  `----´                              |
 |#   #    JP35...  .                        |
 |#   #             :JP12       #:JP14       |
 |#   #             :JP13       #:JP15       |
 |          .-------\           #  #  #  #  #| 
 | :JP16    |ZIF    |=   : ::::::  # U39-42 #| <--- note
 |          |socket3||JP17 JP19-25 #  #  #  #|  If IC's have fewer pins
 |          |       || JP26       #  #  #  # |  than socket, then insert
 |          `-------´| :     JP31 # U43-46 # |  IC as "low" as possible,
 |  ..  ..    ...  ... :   JP30:: #  #  #  # |  i.e ICpin1 in socketPin3.
 `--J3--J5-----J6---J7-----------------------' 

J3=TurboLED, J5=ResetSwitch, J6=Speaker, J7=Keylock/PowerLED

Disable VESA functions of the mainboard if VESA localbus slots is not
used. This will enhance performance. Both VESA slots are slave slots.
VESA bus.   JP12  JP35
Enabled     2-3   2-3
Disabled    1-2   1-2

Cache memory.
        JP14  JP15  JP22  JP23  JP24  JP25  JP30  JP31  U25   U39-42 U43-46
128kB:  open  open  1-2   2-3   1-2   1-2   open  open  8Kx8  32Kx8  none
256kB:  short open  1-2   1-2   1-2   2-3   short open  32Kx8 32Kx8  32Kx8
512kB:  short short 1-2   1-2   1-2   1-2   short short 32Kx8 128Kx8 none

CPU type selection.    JP26
486DX/DX2,487SX,P24T   1-2,3-4
486SX                  2-3

CPU speed select. JP17  JP19  JP20  JP21
25MHz             short short 2-3   2-3
33MHz             short open  1-2   2-3

BIOS.              JP11
Flash ROM on U9    1-2
EPROM BIOS on U9   2-3  (default)

Display adapter.  JP8
Monochrome        1-2
Color             2-3  (default)

Interrupts in the PCI slots. PCI slot 1,4 = slave, 2,3 = master.
Install PCI master add-on cards in master slots, slave add-on cards
in any slot. PCI slots have 4 common IRQ lines (INTA..INTD). When
a card is inserted and uses an IRQ-line, jumpers must be set to
map that IRQ-line to the mainboard IRQ you intend to use.
Only INTA supports shared interrupt.
            IRQ7       IRQ9       IRQ10     IRQ11     IRQ15
INTA#       -          -          JP5:1-2   JP4:1-2   JP3:1-2
INTB#       JP6:2-3    JP6:1-2    -         -         -
INTC#       -          -          JP5:2-3   JP4:2-3   JP3:2-3
INTD# is always hardwired to IRQ14 for IDE or IDE cache
(Defaults is INTA:IRQ11, INTB:IRQ7, INTC:IRQ15)

Green function sense. The Green functions monitors IRQ lines.
1: IRQ7(default):JP1:1-2, IRQ10:JP1:3-4, IRQ11:JP1:5-6
2: IRQ5(default):JP2:1-2, IRQ9:JP2:3-4

Reserved jumpers:
JP32:2-3, JP33:open, JP9:open, JP16:open

/Tomas Andersson 1997 (updated jan2000)