Measurement Computing CIO-DIO24/CTR3 - Manual (Page 10)

CIO-DIO24/CTR3 User's Guide Installing the CIO-DIO24/CTR3
PC I/O Address Summary
Hex Range Function Hex Range Function
000-00F 8237 DMA #1 2C0-2CF EGA
020-021 8259 PIC #1 2D0-2DF EGA
040-043 8253 TIMER 2E0-2E7 GPIB (AT)
060-063 8255 PPI (XT) 2E8-2EF SERIAL PORT
060-064 8742 CONTROLLER (AT) 2F8-2FF SERIAL PORT
070-071 CMOS RAM & NMI MASK (AT) 300-30F PROTOTYPE CARD
080-08F DMA PAGE REGISTERS 310-31F PROTOTYPE CARD
0A0-0A1 8259 PIC #2 (AT) 320-32F HARD DISK (XT)
0A0-0AF NMI MASK (XT) 378-37F PARALLEL PRINTER
0C0-0DF 8237 #2 (AT) 380-38F SDLC
0F0-0FF 80287 NUMERIC CO-P (AT) 3A0-3AF SDLC
1F0-1FF HARD DISK (AT) 3B0-3BB MDA
200-20F GAME CONTROL 3BC-3BF PARALLEL PRINTER
210-21F EXPANSION UNIT (XT) 3C0-3CF EGA
238-23B BUS MOUSE 3D0-3DF CGA
23C-23F ALT BUS MOUSE 3E8-3EF SERIAL PORT
270-27F PARALLEL PRINTER 3F0-3F7 FLOPPY DISK
2B0-2BF EGA 3F8-3FF SERIAL PORT
You can set the base address switch to any address in the range of 000-3FC. If you are not using IBM
prototyping cards or another board which occupies these addresses, the CIO-DIO24/CTR3 board's default
address of 300h is free to use.
Addresses not specifically listed, such as 390-39Fh, are not reserved and may be available. Check your
computer for other boards which may use I/O addresses.
Interrupt level
The trigger logic on the CIO-DIO24/CTR3 is quite simple. Pin 1 (
IR Input
) of the board's 37-pin connector is
an input jumper which maps the interrupt directly onto the PC bus. The signal to the bus is buffered. The buffer
is enabled by a LOW level on Pin 2,
IR Enable
.
Interrupts are hardware-initiated software routines. Most hardware interrupts are assigned by the computer and
are reserved for internal system use. Refer to the following table for some typical interrupt assignments on a
computer.
The CIO-DIO24/CTR3 is shipped with the jumper in the "
X
" position, which means that no interrupt level is set
( ). Leave the jumper in the default "X" position for now. If your software employs interrupt service
routines, it will direct you to select an IRQ level. Use the jumper block labeled
IR
above the PC bus interface
(gold pins) if you want to set the interrupt.
Figure 3
Figure 3. Interrupt level select jumper (no interrupt level set)
IR
2 3 4 5 6 7 X
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