Measurement-computing CIO-DAS08-PGH User Manual download pdf (Page 7)

The following table shows some typical interrupt assignments on a PC. The CIO-DAS08-PGx use interrupt levels 2 through 7.

The levels most often available are 5 and 7.

Table 1-2. IRQ Assignments

LPTIRQ7

UNASSIGNEDIRQ15FLOPPY DISKIRQ6

HARD DISKIRQ14HARD DISK (XT) or LPT (AT)IRQ5

80287 NUMERIC CO-PIRQ13COM OR SDLCIRQ4

UNASSIGNEDIRQ12COM OR SDLCIRQ3

UNASSIGNEDIRQ11RESERVED (XT)

INT 8-15 (AT)

IRQ2

UNASSIGNEDIRQ10KEYBOARDIRQ1

RE-DIRECTED TO IRQ2IRQ9TIMERIRQ0 (AT)

REAL TIME CLOCK (AT)IRQ8PARITYNMI

DESCRIPTIONNAMEDESCRIPTIONNAME

NOTE: IRQ8-15 are AT only.

1.2.3 XTAL/PC Bus Clock Jumper

The A/D pacer clock sources for the MetraByte DAS-8PGA differs from the DAS-8.

The source for the DAS-8PGA is fixed at 1 MHz while the source for the DAS-8 gets

its clock pulse from the PC Bus Clock.

The CIO-DAS08-PGx pacer clock is selected by jumper to satisfy software written

for either board (Figure 1-3). The default choice for this jumper is the 1 MHz

position. You can alternately select the PC Bus Clock as the source for the A/D pacer

clock.

Figure 1-3. Pacer Clock Select Jumper

1.2.4 Wait State

A wait state can be enabled on the CIO-DAS08-PGx by selecting WAIT STATE ON

at the jumper provided on the board. Enabling the wait state causes the personal

computer's bus transfer rate to slow down for board reads and writes ..

The wait state jumper is provided in case your computer ever has an I/O bus transfer

rate which is too fast for the CIO-DAS08-PGA. If your board were to fail sporadically

in random ways, try selecting the wait state ON.

Figure 1-4. Wait State Jumper Block

1.2.5 Installing The CIO-DAS08-PGx In The Computer

1. Turn the power off.

2. Remove the cover of your computer. Please be careful not to dislodge any of the cables installed on the boards in your

computer as you slide the cover off.

3. Locate an empty expansion slot in your computer.

4. Push the board firmly down into the expansion bus connector. If it is not seated fully it may fail to work and could short circuit

the PC bus power onto a PC bus signal. This could damage the motherboard in your PC as well as the board.

1 MHz

CLK

BUS

CLOCK SOURCE JUMPER - For a

standard DAS-8PGA 1 MHz A/D

Pacer Clock, place the jumper on the

two leftmost pins. For a DAS-8 type

A/D Pacer from PC Bus Clk, place the

jumper on the two rightmost pins.

WAIT

STATE

wait state is not selected on this

jumper block. For a wait state,

place the jumper on the two

leftmost pins.

WAIT STATE JUMPER BLOCK - A

1 2 3 4 5 6 7 8 9 10 11 12 ... 27 28

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Measurement-computing CIO-DAS08-PGH User Manual Page 7

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