Measurement Computing DaqBoard-ISA - Manual (Page 15)

DaqBoard-ISA User’s Manual 02-10-02 Setup and Startup 2-3
JP8 – DMA and Interrupt
Interrupt Selection. ISA-type DaqBoards may be set to interrupt the PC when certain
hardware conditions occur. The interrupt may be set to IRQ level 10, 11, 12, 14 or 15.
DaqBoard’s IRQ level cannot be shared with another device. To disable interrupt assistance
and background transfers you can configure JP8 to “Open Interrupt.” See the “Open
Interrupt” setting in the following figure.
DMA Selection. Direct Memory Access (DMA) configuration provides for:
(a) high-speed data transfer from the ADC FIFO, or
(b) high-speed data transfer to the DAC FIFO.
Note: Only DMA channels 5-7 (of an ISA AT machine’s seven channels) are
available to DaqBoard.
Set DRQ and DACK jumpers to the desired DMA channels. Note that DaqBoard does not
share DMA channels.
Set the DMA jumpers to OPEN when other devices will be using DMA channels 5, 6 and 7.
SW1 - Base Address
SW1’s factory default is 300 Hex. If 300 Hex presents an address conflict, set a new SW1 address within
the range of 1FF to 3FF (256 to 1023 Decimal). Note that the address must be on a 4-byte boundary.
Industry Standard I/O Addresses
Hex Range Device Hex Range Device
000-1FF Internal system 368-36B PC network (high address)
200-207 Game I/O 36C-36F Reserved
20C-20D Reserved 378-37F Parallel printer port 1
21F Reserved 380-38F SDLC, bisynchronous 2
278-27F Parallel printer port 2 390-393 Reserved
2B0-2DF Alternate enhanced graphics adapter 3A0-3AF Bisynchronous 1
2E1 GPIB (Adapter 0) 3B0-3BF Monochrome display and printer adapter
2E2 & 2E3 Data acquisition (Adapter 0) 3C0-3CF Enhanced graphics adapter
2F8-2FF Serial port 2 3D0-3DF Color/Graphics monitor adapter
300-31F Prototype card 3F0-3F7 Diskette Controller
360-363 PC network (low address) 3F8-3FF Serial port 1
364-367 Reserved
Notes:
(1) SW1’s address must be unique, i.e., not used by another device.
(2) I/O addresses, hex 000 to 0FF, are reserved for system board I/O.
(3) Hex 100 to 3FF are available on the I/O channel.
(4) Although the above table represents industry standards, some systems may vary.