Measurement Computing PC104-DAC06 - Manual (Page 7)

Table 3-1. 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
PROTOTTYPE 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 PC104-DAC06 BASE switch may be set for address in the range of 000-3F0 so it
should not be hard to find a free address area for your PC104-DAC06. Once again, if
you are not using IBM prototype cards or some other board which occupies these
addresses, then 300-31Fh are free to use. Address not specifically listed, such as
390-39Fh, are free.
3.2 SIMULTANEOUS UPDATE JUMPER
The analog outputs can be jumpered so that new output data is held until two, four, or
six DACs have been loaded with new digital data. Then, as a group, those that are
jumpered for simultaneous outputs will have that new data sent to the voltage outputs.
Simultaneous update occurs whenever any addresses BASE + 0 through BASE + 11
are read.
The analog output chips are dual DACs. A single jumper sets both DACs on a single
chip to be either simultaneous TRANSFER or individual UPDATE.
3