Settings
Mouse interrupt IRQ12
With the jumper BLOCK1-IRQ12 you can set the interrupt IRQ12.
IRQ12 used by mouse = jumper BLOCK1-IRQ12 set to 1-2
IRQ12 not used = jumper BLOCK1-IRQ12 set to 2-3
Default setting:
Jumper BLOCK1-IRQ12 set to 1-2 = IRQ12 used by mouse
VGA interrupt IRQ9
With the jumper BLOCK3-IRQ9 you can set the interrupt IRQ9.
IRQ9 not used = jumper BLOCK3-IRQ9 set to 1-2
IRQ9 used by VGA controller = jumper BLOCK3-IRQ9 set to 2-3
Default setting:
Jumper BLOCK3-IRQ9 set to 1-2 = IRQ9 not used
Processor settings
When you upgrade the processor, you must check and set the jumpers
BLOCK2-33/25M and BLOCK2-DX/SX.
External clock rate
With the jumper BLOCK2-33/25M you can define the external clock rate of the
processor (33 MHz or 25 MHz).
External clock rate 25 MHz = Jumper BLOCK2-33/25M set to 1-2
External clock rate 33 MHz = Jumper BLOCK2-33/25M set to 2-3
Default setting:
Depending on the built-in processor
A26361-D824-Z120-5-7619
21
Settings
Processor type
With the jumper BLOCK2-DX/SX you can define the processor type.
SX processor = Jumper BLOCK2-DX/SX set to 1-2
All other processor types (including SX2) = Jumper BLOCK2-DX/SX set to 2-3
Default setting:
Depending on the built-in processor
First level cache
The setting of the jumpers BLOCK4-WT and BLOCK4-RS depends on the first
level cache.
If the system board is fitted with a processor with a write-back cache (e.g. Pentium
OverDrive, i486DX2A), the jumpers must be set to 2-3. If it is fitted with a processor
with a write-through cache (e.g, DX, DX2, etc.) the jumpers must be set to 1-2.
Write-through = jumper BLOCK4-WT and BLOCK4-RS are set to 1-2
Write-back = jumper BLOCK4-WT and BLOCK4-RS are set to 2-3
Default setting:
depends on the type of processor installed
Monitor controller settings
Primary monitor controller
With the jumper BLOCK2-COLOUR you can set the primary monitor controller.
Color monitor controller = Jumper BLOCK2-COLOUR set to 1-2
Monochrome monitor controller = Jumper BLOCK2-COLOUR set to 2-3
Default setting:
jumper BLOCK2-COLOUR set to 1-2 = Color monitor controller
Monitor controller on the system board
With the jumper BLOCK3-VGA you can enable or disable the monitor controller on
the system board.
Monitor controller enabled = Jumper BLOCK3-VGA set to 1-2
Monitor controller disabled = Jumper BLOCK3-VGA set to 2-3
Default setting:
Jumper BLOCK3-VGA set to 1-2 = Monitor controller enabled
22
A26361-D824-Z120-5-7619
