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Step 4: Configuring the GP488B/MM Interface DMA Channel
1. The factory default DMA channel is 1. If this creates a conflict, reset jumper JP2 according to the
figure.
2. If reset, record the new DMA channel being used.
Direct Memory Access (DMA) is a high-speed method of transferring data from or to a peripheral, such
as a digitizing oscilloscope, to or from the PC's memory. The factory default selection is DMA
Channel 1. Notice that jumper JP2 is used to select the DMA channel.
Check your computer documentation to ensure the selected DMA channel is not being used by another
device. The GP488B/MM board has circuitry which allows for more than one GP488B/MM board to
share the same channel. Most computers use DMA Channel 2 for floppy disk drives, making that
channel unavailable.
Personal488 User's Manual For Windows 95 and Windows NT
Personal488/MM (with GP488B/MM)
37
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