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Copyright 1991 David Jurgens |
Parallel Printer Port
Port 3BC printer data output (readable)
│7│6│5│4│3│2│1│0│ ports 278, 378, 3BC
│ │ │ │ │ │ │ └──── data bit 0, hardware pin 2
│ │ │ │ │ │ └───── data bit 1, hardware pin 3
│ │ │ │ │ └────── data bit 2, hardware pin 4
│ │ │ │ └─────── data bit 3, hardware pin 5
│ │ │ └──────── data bit 4, hardware pin 6
│ │ └───────── data bit 5, hardware pin 7
│ └────────── data bit 6, hardware pin 8
└─────────── data bit 7, hardware pin 9
Port 3BD printer status register (Parallel Printer Port)
│7│6│5│4│3│2│1│0│ ports 279, 379, 3BD
│ │ │ │ │ │ │ └──── 1 = time-out
│ │ │ │ │ └─┴───── unused
│ │ │ │ └──────── 1 = error, pin 15
│ │ │ └───────── 1 = on-line, pin 13
│ │ └────────── 1 = out of paper, pin 12
│ └─────────── 0 = Acknowledge, pin 10
└──────────── 0 = busy, pin 11
Port 3BE printer control register (Parallel Printer Port)
│7│6│5│4│3│2│1│0│ ports 27A, 37A, 3BE
│ │ │ │ │ │ │ └──── 1 = output data to printer, (pin 1)
│ │ │ │ │ │ └───── 1 = auto line feed, (pin 14)
│ │ │ │ │ └────── 0 = initialize printer, (pin 16)
│ │ │ │ └─────── 1 = printer reads output, (pin 17)
│ │ │ └──────── 0 = IRQ disable,1=IRQ enable for ACK
└─┴─┴───────── unused
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parallel port |
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