Interrupt Level - Measurement Computing CIO-DIO24H User Manual

CIO-DIO24H User's Guide
Hex Range Function
0A0-0A1 8259 PIC #2 (AT)
0A0-0AF NMI MASK (XT)
0C0-0DF 8237 #2 (AT)
0F0-0FF 80287 NUMERIC CO-P (AT)
1F0-1FF HARD DISK (AT)
200-20F GAME CONTROL
210-21F EXPANSION UNIT (XT)
238-23B BUS MOUSE
23C-23F ALT BUS MOUSE
270-27F PARALLEL PRINTER
2B0-2BF EGA
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-DIO24H 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-DIO24H is quite simple. Pin 1 (
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,
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-DIO24H is shipped with the jumper in the "
( Figure 3 ). 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
(gold pins) if you want to set the interrupt.
.
IR Enable
2 3 4 5 6 7 X
Figure 3. Interrupt level select jumper (no interrupt level set)
Hex Range
320-32F
378-37F
380-38F
3A0-3AF
3B0-3BB
3BC-3BF
3C0-3CF
3D0-3DF
3E8-3EF
3F0-3F7
3F8-3FF
) of the board's 37-pin connector is an
IR Input
" position, which means that no interrupt level is set
X
IR1
11
Installing the CIO-DIO24H
Function
HARD DISK (XT)
PARALLEL PRINTER
SDLC
SDLC
MDA
PARALLEL PRINTER
EGA
CGA
SERIAL PORT
FLOPPY DISK
SERIAL PORT
above the PC bus interface
IR1