Interfacing The PC Using Interrupts Interrupt ReQuests (IRQs), Programmable Interrupt Controllers (PICs) Interrupt Service Routines (ISRs)

Interfacing the Serial - RS-232 Port Serial pinouts (D25 and D9 connectors) Null Modems 8250 Universal Asynchronous Receiver / Transmitters (UART) Polling vs. interrupt mode interfacing to 16450, 16550 UARTs interfacing to DP6402, AY-5-1015 - D36402R-9 etc UARTs Serial Port Interrupt Vectors Serial Port Interrupt Service Routines (ISRs)

Interfacing the Parallel Port Enhanced Parallel Port (EPP) read/write cycle diagrams Interfacing the Extended Capabilities Parallel Port ECP read/write cycle diagrams

Parallel Port Interfacing Example 16 Character x 2 Line LCD How to control a HD44780-based Character-LCD Parallel Port Debug Utility

Interfacing the PC's Keyboard Keyboard Scan Codes Host Commands, Keyboard return Commands, 5 pin DIN AT connector and PS/2 connector communications protocol diagram 68HC705 Keyboard to ASCII Decoder Keybrd05.zip 68HC705J1A Source code for Keyboard to ASCII Decoder

68HC11 based Two Line RS-232 Mini-Terminal full duplex mode keyboard scan codes converted to ASCII, which is transmited to the RS-232 output. RS-232 Input is displayed on a LCD.

This webpage was last updated on March 14, 2001

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