IBM 8478 Hardware Maintenance Manual - Page 53
System, board, switches, jumpers
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Mouse Keyboard Serial A Parallel Serial B Ethernet USB 2 USB 3 MIDI Line out Line in Mic System board switches and jumpers The following illustration identifies the switches and jumpers on the system board. 1 2 3 CMOS jumper (JBAT1) Boot block jumper 3 2 1 Boot block jumper (JROM1) For normal operations of the system, a jumper is installed on pins 2 and 3 of the boot block jumper. See "Recovering BIOS" on page 18 for information about the boot block jumper. Chapter 5. Installing options 43
Keyboard
Mouse
Serial A
Parallel
Serial B
Ethernet
USB 2
USB 3
MIDI
Line out
Line in
Mic
System
board
switches
and
jumpers
The
following
illustration
identifies
the
switches
and
jumpers
on
the
system
board.
CMOS jumper
(JBAT1)
Boot block jumper
(JROM1)
1
1
2
2
3
3
Boot
block
jumper
For
normal
operations
of
the
system,
a
jumper
is
installed
on
pins
2
and
3
of
the
boot
block
jumper.
See
“Recovering
BIOS”
on
page
18
for
information
about
the
boot
block
jumper.
Chapter
5.
Installing
options
43