ErgoPro e-, x- and s- Series PC Specialist's Handbook
Page 88 First Edition, Release 4 - June 1998
I/O addresses
The I/O address map is shown below. The hexadecimal addresses 000 to 0FF are reserved for the system board
I/O. The addresses hex 100 through 3FF are available for the I/O channel. Additional addresses are allocated for
the TokenRing adapter boards, and serial ports COM3 and COM4.
Bold italics indicate I/O addresses that are used in the basic configuration, including the VGA Display adapter
board, the IDE interface, and the SCSI Mass storage adapter board.
System board addresses 000 to 0FF
Hex range
Device
000 - 00F DMA controller 1, slave
020 - 021 Interrupt controller 1, master
022, 024 Chip set configuration registers
040 - 043 Timer/Counter 1
060 , 064 Keyboard controller
061 Test register
070 - 071 Real-time clock, CMOS RAM
080 - 08F DMA page registers
0A0 - 0A1 Interrupt controller 2, slave
0C0- 0DF DMA controller 2, master
0F0 Clear Math co-processor busy
0F1 Reset Math co-processor
0F8 - 0FF Math co-processor
I/O channel addresses 100 to 3FF
Hex range
Device
102 ErgoGrafix
120 - 121 ICL config. registers by default
130 - 131 Alternative for ICL config. registers
140 - 141 Alternative for ICL config. registers
170 - 177 Secondary IDE interface
1CE - 1CF ErgoGrafix 422i (when PCI MACH64 I/O reloc is disabled (RSU))
1F0 - 1F7 Primary IDE interface
200 - 207 Aztech audio (xs-series)
220 - 22F On-board audio interface (10 bit decoding)
Aztech audio (xs-series, Sound Blaster compatibility module)
240 - 24F Alternative for audio interface (10 bit decoding)
278 - 27B Parallel port 2 (LPT 2)
278 - 27F Parallel port 2 (LPT 2), EPP mode
280 - 29F On-board Ethernet (alternative)
2A0 - 2BF On-board Ethernet (alternative)
2CE - 2EF ErgoGrafix 422i (when PCI MACH64 I/O reloc is disabled (RSU))
2F8 - 2FF Serial port 2 (COM2)
300 - 301 Aztech audio (xs-series, MIDI (MPU401) module)
378 - 37B Parallel port 1 (LPT1)
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