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COSC 456 Lesson 19: Laboratory 5

COSC 456 Lesson 19: Laboratory 5. IBM PC Interfacing. The parallel port is a 25-pin DB-25 (D-shaped) connector accessible from the back of the PC The expansion slot provides access to the address bus, data bus, several IRQ lines, clock signal, and several control lines.

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COSC 456 Lesson 19: Laboratory 5

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  1. COSC 456Lesson 19: Laboratory 5

  2. IBM PC Interfacing • The parallel port is a 25-pin DB-25 (D-shaped) connector accessible from the back of the PC • The expansion slot provides access to the address bus, data bus, several IRQ lines, clock signal, and several control lines

  3. Parallel Port (DB-25 connector)

  4. DB-25 Pin Functions • Pins 2 through 9 are the 8 data pins D0 through D7. Data Port = “base” address of the printer port(378) • Pins 18 through 25 are ground pins • Pins 1, 14, 16, and 17 are -strobe,-auto feed,initialize, and -select input. These are all outputs to the printer and accessed via the Control Port whose address is base + 2 • Pins 10, 11, 12, 13, and 15 are -acknowledge, busy,paper empty,select, and -error. These are outputs from the printer and accessed via the Status Port whose address is base + 1.

  5. Moving data IN and OUT IN Reads in the data from a peripheral device (I/O) OUT Sends data out to a peripheral device(I/O) MOV sends data to and from memory

  6. IN and OUT the right way . . . IN AL, 40H Data from port 40h is read into AL OUT 40H, AL Data from AL is sent to port 40h IN AL, 340H Illegal because 340 is > FF MOV DX, 378 Data from port 378 is read into AL IN AL, DX OUT DX, AL Data from AL sent to port 378

  7. Memory Map • 00000-003FF 1K Interrupt Vectors • A0000 - BFFFF 128 K Video RAM • B8000-BBFFF 16K CGA • A0000-AFFFF 64K VGA • 00400-004FF 1/4 K BIOS Data Area • F0000 - FFFFF 64 K BIOS ROM

  8. I / O Map • 00 - 1F DMA controller 8237A • 20 - 21 PIC1 (master) 8259A • 60 - 63 Keyboard controller 8042 • 70 - 71 Real-time clock MC 146818 • 80 - 83 DMA page register 74LS612 • 1F0-1F8 Hard-disk controller • 200-207 Game adapter • 278-27F Parallel "printer" port 2 (LPT2) • 300-31F Prototype adapter for interfacing • 378-37F Parallel "printer" port1 (LPT1) • 3D0-3DF CGA / VGA controller • 3F0-3F7 "Floppy" disk controller • 3F8-3FF Serial port1 (asynchronous: COM1)

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