Technical Information 1-7
n Blanks out the monitor
Puts the video controller into sleep mode. The vertical sync clock and blank
signals to the monitor are disabled.
n Forces the IDE devices into stand-by mode
A suspend command is sent to the IDE devices which put the devices into a
stand-by mode.
I/O Addressing
The processor communicates with I/O devices by I/O mapping. The hexadecimal (hex)
addresses of I/O devices are listed in Table Section 1-5.
Table Section 1-5 I/O Address Map
Address (Hex) I/O Device Name
0000-000F DMA controller 1 (channel 0-3)
0020-0021 Interrupt controller 1
0040-0043 Timer 1
0048-004B Timer 2
0060 Keyboard controller byte
0061 NMI, speaker controller byte
0064 Keyboard controller, CMD/STAT byte
0070, bit 7 Enable NMI
0070, bit 6:0 Real-time clock address
0071 Real-time clock data
0073 Reserved for system board Configuration
0075 Reserved for system board Configuration (read only)
0078 BIOS timer
0080-008F DMA page register
00A0-00A1 Interrupt controller 2
00C0-00DE DMA controller 2 (channel 4-7)
00F0 Reset numeric error
0170-0177 Secondary IDE channel
01F0-01F7 Primary IDE channel
0278-027B Parallel port 2
02F8-02FF Asynchronous communications port 2
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