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Management UART (COM3 or COM4)
This is a standard 16550-compatible serial port, occupying 8 contiguous
bytes. The Management UART interrupt is software selectable (Apricot
Control Register) to be IRQ10, IRQ14 or IRQ15. The serial interface
uses TTL levels.
Diagnostic UART
This is a standard 16550 compatible serial port, occupying 8 contiguous
bytes. The UART interrupt is software selectable (Apricot Control
Register) to be IRQ10, IRQ14 or IRQ15. The serial interface uses TTL
levels.
Diagnostic Processor
The Diagnostic Processor has its own power-on reset, as it holds the
entire motherboard in reset while its firmware initializes.
Port 0 : Input data port
The data source is selected via port 2.
Bits
Function
7:0
Port 80 diagnostic code (Port 0 : Input Port)
3
Ambient Temperature: 1 = over temperature (System Status
Monitor)
2:0
Fan fail; 1=fail (System Status Monitor)
Port 1
Bits
Function
4
Motherboard reset - active high
Port 2
Bits
Function
4
Port 80 port read : active low
1
System status port read: active low
T e c h n i c a l I n f o r m a t i o n
OWNER'S HANDBOOK 5-45
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