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Database System Concepts
Database System Concepts
7th Edition
ISBN:9780078022159
Author:Abraham Silberschatz Professor, Henry F. Korth, S. Sudarshan
Publisher:Abraham Silberschatz Professor, Henry F. Korth, S. Sudarshan
Chapter1: Introduction
Section: Chapter Questions
Problem 1PE
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SAMPLE PROGRAM BACK_SP EQU $08 ASCII code for backspace DELETE EQU $01 ASCII code for delete CAR_RET EQU $0D ASCII code for carriage return ORG $00400 Data origin LINE DS.B 64 Reserve 64 bytes for line buffer * Input a character and store it in a buffer ORG $001000 Program origin LEA LINE,A2 BSR GET_DATA CMP.B #BACK_SP,D1 BEQ MOVE_LEFT CMP.B #DELETE,DI BEQ CANCELL CMP.B #CAR_RET,D1 BEQ EXIT MOVE.B D1,(A2)+ BRA NEXT MOVE_LEFT LEA -1(A2),A2 BRA NEXT CANCEL LEA LINE,A2 BRA NEXT GET_DATA MOVE #5, D1 TRAP #15 RTS NEXT EXIT STOP #$2700
Transcribed Image Text:SAMPLE PROGRAM BACK_SP EQU $08 ASCII code for backspace DELETE EQU $01 ASCII code for delete CAR_RET EQU $0D ASCII code for carriage return ORG $00400 Data origin LINE DS.B 64 Reserve 64 bytes for line buffer * Input a character and store it in a buffer ORG $001000 Program origin LEA LINE,A2 BSR GET_DATA CMP.B #BACK_SP,D1 BEQ MOVE_LEFT CMP.B #DELETE,DI BEQ CANCELL CMP.B #CAR_RET,D1 BEQ EXIT MOVE.B D1,(A2)+ BRA NEXT MOVE_LEFT LEA -1(A2),A2 BRA NEXT CANCEL LEA LINE,A2 BRA NEXT GET_DATA MOVE #5, D1 TRAP #15 RTS NEXT EXIT STOP #$2700
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