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When the port is written, the DiagP must be informed through an interrupt
line (PORT80_IRQ).
When the DiagP reads the port, the interrupt line must be automatically reset.
BIOS Page Register 120h (write only)
This controls the BIOS and SRAM paging. All bits are cleared on reset.
When the Flash disk/SRAM decoding is disabled, the BIOS has a page size
of 32 Kbytes. Bit 4 of the Control Register = 0.
Bits
7:3
2:1
0
When Flash disk/SRAM decoding is enabled, the BIOS has a page size of 16
Kbytes. Bit 4 of the Control Register = 1
Bits
7:3
2:0
DOS Flash Page Register 121h (write only)
This controls the Flash disk paging. All bits are cleared on reset.
Bits
7:0
Control Register 122h (R/W)
This contains miscellaneous control bits. All bits are cleared on reset.
Bits
7:6
5
4
3
2
1:0
S y s t e m m a n a g e m e n t c a r d s
Function
n/a
BIOS page (0 - 3)
n/a
Function
n/a
BIOS page (0 - 7)
Function
Flash disk page (0 - 255)
Function
IRQ select for COM port:
00 = No IRQ selected
01 = IRQ10
10 = IRQ14
11 = IRQ15
Management UART address: 0=COM3: 1=COM4
Enable DOS Flash/SRAM decode: 1=enable
Enable DOS Flash write: 1=enable
Enable BIOS Flash write: 1=enable
IRQ select for Diagnostic UART:
00 = No IRQ selected
01 = IRQ10
10 = IRQ14
11 = IRQ15
13/3
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