Acces 104-QUAD-8 User Manual

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Contents

Acces 104-QUAD-8 User Manual Manual pdf 12 page image

Manual 104-QUAD-812The board’s base address is set up by JUMPERS. Those jumpers control address bits A5 through A9.(Lines A4, A3, A2, A1 and A0 are used on the board to control individual registers. How these four linesare used is described in the Programming section of this manual.)To determine how to set these JUMPERS for a desired hex-code address, refer to the SETUP programprovided with the board. If you prefer to determine proper jumper settings yourself, first convert the hex-code address to binary form. Then, for each "0", install corresponding jumpers and for each "1", removethe corresponding jumper.The following example illustrates jumper selection corresponding to hex 300 (or binary 11000x xxxx). The "x xxxx" represents address lines A4, A3, A2, A1, and A0 used on the boardto select individual registers as described in the Programming section of this manual.Base Address in Hex Code 3 0Conversion Factors 2 1 8 4 2Binary Representation 1 1 0 0 0Jumper Legend A9 A8 A7 A6 A5Addr. Line Controlled A9 A8 A7 A6 A5Jumper Selection OFF OFF ON ON ONTable 4-2: Hex Conversion TableCarefully review the address selection reference table on the preceding page before selecting the boardaddress. If the addresses of two installed functions overlap, you will experience unpredictable computerbehavior.