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Table 1: Addresses for standard I/O devices
Address Standard device
000-1FF Internal system board
200-20F Games port
210-217 Expansion unit
220-24F Reserved
250-257 Not assigned
258-25F Intel 'Above Board'
260-277 Not assigned
278-26F Reserved
280-2EF Not assigned
2F0-2F7 LPT2
2F8-2FF COM2
300-31F Prototype Board
320-32F Hard Disk
330-377 Not assigned
378-37F LPT1
380-38F SDLC communications
390-39F Not assigned
3A0-3AF Binary comms
3B0-3BF Mono Display Adaptor
3C0-3CF Reserved
3D0-3DF CGA
3E0-3E7 Reserved
3E3-3EF Not assigned
3F0-3F7 Floppy disk
3F8-3FF COM1
400-FFF Not used see below
Table 1: Standard I/O Addresses
1 2 3
ON
4 5 6 7 8
1000 800 400 200 100 80 40 20 Hex Weight when OFF
A12 A11 A10 A9 A8 A7 A6 A5 Corresponding Address line
Figure 1: Dip Switch Address Weight (in Hex)