Mitsubishi Apricot MS Series Owner's Handbook Manual page 53

OWNER'S HANDBOOK
On-board video disabling (J50)
If you install a video adapter expansion card, the
computer should automatically detect this and disable
the on-board video adapter. If for some reason this
does not happen, and you experience problems with a
newly-fitted card, you can manually disable the on-
board video adapter by moving the jumper in block
J50 to pins 2-3.
Audio disabling (J80)
The on-board audio codec can be disabled by moving
the jumpers on jumper block J80 to pins 2-3.
Disabling the audio system frees the interrupts and
DMA channels used by that system (normally IRQ5,
IRQ11, DMA0 and DMA1).
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