Tài liệu Parallel Port Complete- P7 doc

Ngày tải lên: 24/12/2013, 19:15

... (SPP) The parallel port in the original IBM PC, and any port that emulates the original port& apos;s design, is sometimes called the SPP, for standard parallel port, even though the original port had ... early PCs, the parallel port had a base address of 3BCh. On newer systems, the parallel port is most often at 378h. But all three addresses are reserved for parallel por...

Ngày tải lên: 15/12/2013, 13:15

... clues. 1 0  Parallel Port Complete Please purchase PDF Split-Merge on www.verypdf.com to remove this watermark. Table 2-2: Parallel port bits, arranged by register. Accessing Ports Parallel Port Complete  1 9 Data ... current, and if your parallel port has weak outputs, you may have problems in using other devices on the same port as the key. Alternatives to the Parallel...

Ngày tải lên: 15/12/2013, 13:15

... other waveform by connecting a parallel port& apos;s outputs to the inputs of a digital-to-analog converter (DAC, and writing a repeat- ing series of bytes to the port. One way to generate the ... remove this watermark. Programming Issues Ports that support ECP mode can use direct memory access (DMA), where data can transfer between memory and a port without intervention by the CPU. The...

Ngày tải lên: 24/12/2013, 19:15

Ngày tải lên: 24/12/2013, 19:15

Ngày tải lên: 24/12/2013, 19:15

... 0; Pascal programmers can use the port function to access parallel ports. To write AAh to a Data port at 378h: port[ 378h]:=AAh To read a Status port at 379h: value: =port[ 379h] Delphi 2.0 The 32-bit ... ability. EPP and ECP Support A port that supports EPP or ECP modes of data transfer has the best chance for fast parallel- port transfers. An SPP requires four port writes to...

Ngày tải lên: 15/12/2013, 13:15

Ngày tải lên: 24/12/2013, 19:15

Ngày tải lên: 24/12/2013, 19:15

Ngày tải lên: 24/12/2013, 19:15