Measurement Computing PC104-DIO48 - Manual (Page 6)

The actual address is constructed by calculating the HEX or decimal
number Base Address Select Switches which corresponds to the base
address bits the PC104-DIO48 will respond to. For example, in Figure
2-1, switches 1 and 2 down, all others are up. Switch 1 = 200 hex (512
decimal) and switch 2
= 100 hex (256 decimal). When added together
they equal 300 hex (768 decimal).
Certain address are reserved for use by the PC (Table 2-1). Others are
free and can be used by the PC104-DIO48 and other expansion boards.
We recommend that BASE = 300 hex (768 decimal) be tried first. See
Figure 2-2 for the orientation of the switch block.
Table 2-1. PC I/O Addresses
SERIAL PORT 3F8-3FF EGA 2B0-2BF
FLOPPY DISK 3F0-3F7 PARALLEL PRINTER 270-27F
SERIAL PORT 3E8-3EF ALT BUS MOUSE 23C-23F
CGA 3D0-3DF BUS MOUSE 238-23B
EGA 3C0-3CF EXPANSION UNIT (XT) 210-21F
PARALLEL PRINTER 3BC-3BF GAME CONTROL 200-20F
MDA 3B0-3BB HARD DISK (AT) 1F0-1FF
SDLC 3A0-3AF 80287 NUMERIC CO-P (AT) 0F0-0FF
SDLC 380-38F 8237 #2 (AT) 0C0-0DF
PARALLEL PRINTER 378-37F NMI MASK (XT) 0A0-0AF
HARD DISK (XT) 320-32F 8259 PIC #2 (AT) 0A0-0A1
PROTOTYPE CARD 310-31F DMA PAGE REGISTERS 080-08F
PROTOTYPE CARD 300-30F CMOS RAM & NMI MASK (AT) 070-071
SERIAL PORT 2F8-2FF 8742 CONTROLLER (AT) 060-064
SERIAL PORT 2E8-2EF 8255 PPI (XT) 060-063
GPIB (AT) 2E0-2E7 8253 TIMER 040-043
EGA 2D0-2DF 8259 PIC #1 020-021
EGA 2C0-2CF 8237 DMA #1 000-00F
FUNCTION HEX
RANGE
FUNCTION HEX
RANGE
The PC104-DIO48 BASE switch may be set for address in the range of
000 to 3F8 so it should not be hard to find a free address area for your
PC104-DIO48. Once again, if you are not using IBM prototyping cards
or some other board which occupies these addresses, then 300-31Fh are
free to use. Addresses not specifically listed, such as 390-39Fh, are free.
2