Tài liệu Parallel Port Complete- P1 doc

... (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 thoughthe 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 ports, and if the port& apos;s ... market for a new parallel port or peripheral, it's worth trying to find out if the peripheral supportsusing EPP or ECP mode with your port. Port HardwareThe parallel port& apos;s hardware...

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Tài liệu Parallel Port Complete- P2 doc

... clues.10 Parallel Port CompletePlease 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19Data ... current, and if your parallel port has weak outputs, you may haveproblems in using other devices on the same port as the key.Alternatives to the Parallel Port The parallel port is just one of ... except for a few ports where this bit performs the direction-settingfunction normally done byC5.Bidirectional PortsAccessing PortsOn the original parallel port, the Data port was designed...

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Tài liệu Parallel Port Complete- P4 doc

... other waveform by connecting a parallel port& apos;soutputs 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 IssuesPorts that support ECP mode can use direct memory access (DMA), where datacan transfer between memory and a port without intervention by the CPU. TheDMA ... have to have soft-ware on the receiving end that knows how to decompress what it receives. Parallel ports in ECP mode can automatically decompress incoming data that uses ECPmode's protocol...

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Tài liệu Parallel Port Complete- P5 doc

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Tài liệu Parallel Port Complete- P7 doc

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Tài liệu Parallel Port Complete- P9 docx

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Tài liệu Parallel Port Complete- P3 pdf

... 0;Pascal programmers can use the port function to access parallel ports.To writeAAhto a Data port at 378h: port[ 378h]:=AAhTo read a Status port at 379h:value: =port[ 379h]Delphi 2.0The 32-bit ... ability.EPP and ECP SupportA port that supports EPP or ECP modes of data transfer has the best chance forfast parallel- port transfers. An SPP requires four port writes to read the Status port, write a ... microprocessor'sInand out instructions for port access.To writeAAhto a Data port at 378h:mov dx,378h;store port address in dx30 Parallel Port CompletePlease purchase PDF Split-Merge...

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Tài liệu Parallel Port Complete- P6 pptx

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Tài liệu Parallel Port Complete- P8 pptx

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Tài liệu Parallel Port Complete- P10 ppt

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