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C. System Registers
The ZT 5504 provides several system registers to control and monitor a variety of functions.
Normally, only the system BIOS uses these registers, but they are documented here for
application use as needed. Take care when modifying the contents of these registers, as the
system BIOS may be relying on the state of the bits under their control.
System Register Definitions
The System Registers are accessible as follows:
I/O Address Register Name
Default Value
Access
Size
78h
Flash Control
0x00
R/W
8 bits
79h
Watchdog
0x00
R/W
8 bits
7Bh
J1 IPMB Control
0x00
R/W
8 bits
80h
Port 80
0x00
WO
8 bits
E1h
Event Monitors
0x00
RO
8 bits
E3h
Switch Monitors
0x00
RO
8 bits
E4h
Geographic Address
0x00
RO
8 bits
E5h
Control Bits
0x00
WO
8 bits
PAL
E6h
J5 SMBus Enable
0x00
WO
8 bits
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