Measurement Computing PC104-AC5 - Manual (Page 6)

A complete address is constructed by calculating the HEX or decimal number which
corresponds to all the address bits the board has been instructed to respond to. For
example, in Figure 2-1, switches 9 and 8 are DOWN, all others UP.
Using figure 2-1 as an example, address 9 = 200h (512D) and address 8 = 100h
(256D); added together they equal 300h (768D).
Certain address are used by the PC, others are free and may be used by the
PC104-AC5 and other expansion boards. We recommend BASE = 300h (768D) be
tried first.
2.1.1 I/O Addresses
The BASE switch may be set for an address in the range of 000-3FC so it should not
be hard to find a free address area for your board. If you are not using IBM
prototyping cards or some other board which occupies these addresses, 300-31Fh are
free to use. Refer to Table 2-1.
Addresses not specifically listed, such as 390-39Fh, are free.
Table 2-1. Computer 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 0A0-0A1
PROTOTYPE CARD 310-31F DMA PAGE REGISTERS 080-08F
PROTOTYPE 300-30F CMOS RAM & NMI MASK
(AT) CARD 070-071
SERIAL PORT 2F8-2FF 8742 CONTROLLER (AT) 060-064
SERIAL PORT 2E8-2EF 82C55 PPI (XT) 060-063
GPIB (AT) 2E0-2E7 8253 TIMER 040-043
EGA 2D0-2CF 8259 PIC #1 020-021
EGA 2C0-2CF 8237 DMA #1 000-00F
FUNCTION HEX
RANGE
FUNCTION HEX
RANGE
2