Measurement Computing PC104-PDISO8 - Manual (Page 7)

Table 1-1. 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 BASE switches can be set for an address in the range of 000-3F8 so it should not
be hard to find a free address. Addresses not specifically listed, such as 390-39F, are
free.
2.3 AC INPUT FILTER
The inputs are eight individual, optically isolated (500V) inputs that may be read back
as a single byte. The inputs are not polarity sensitive and can be driven by either AC
(input range
−
24V to +24V RMS, 50 to 1000 Hz) or DC (input range
−
24V to
+24VDC). Each input has a switchable low-pass filter.
The switch which controls the input
filter is shown in Figure 2-2. From left
to right, the switches apply to inputs 0
to 7. The diagram shows the low pass
filter for inputs 0 and 1 enabled.
The filter must be used for AC inputs
and should be used for DC inputs.
Unless you have reason to turn off a
filter, we recommend it be left on.
Figure 2-2. AC Filter Switches
3