Typing game design using DOS function calls (INT21H) in the AH = 2CH get the system time, system time, except for 26 were random numbers, on this basis, with reference letters, it can be random letters. Re-use BIOS function calls in the INT10H AH = 02H, 06H, 09H, 0AH can control the decline in the letters and the letters to judge right or not. The use of 8253 means 2 for timing and 8259A interrupt can control every 10 minutes to print, while the print is applied parallel interface chip 8255A and 8259A interrupt chip to interrupt printing.

TypingGame.doc

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