474: Advanced Assembly Programming¶

In-depth study of x86 assembly language, covering hardware interfacing and low-level I/O.

Topics¶

x86 register architecture and addressing modes
Procedure calls, stack frames, and calling conventions
String and array operations using REP prefixes
Interrupt-driven I/O
Interfacing assembly routines with C

Projects¶

Homework Series (`474/hw4_.asm`, `474/hw5_.asm`, `474/hw6_*.asm`)¶

A progressive series of assembly assignments covering arithmetic, logical operations, string manipulation, and hardware I/O using DOS/BIOS interrupts. Includes a custom stdio.asm utility module implementing formatted output routines.

; stdio.asm — reusable I/O routines for the homework series
STDIO   PUBLIC  OUTCH, GETCH, CRLF, CLEAR, OUTSTR

OUTCH   MOVEM.L A0-A6/D1-D7,-(A7)   ; save registers
        MOVE.B  #248,D7              ; output character in D0
        TRAP    #14
        MOVEM.L (A7)+,A0-A6/D1-D7   ; restore registers
        RTS

GETCH   MOVEM.L A0-A6/D1-D7,-(A7)
        MOVE.B  #247,D7              ; read character into D0
        TRAP    #14
        BSR     OUTCH                ; echo to screen
        MOVEM.L (A7)+,A0-A6/D1-D7
        RTS

CRLF    MOVEM.L A0-A6/D1-D7,-(A7)
        MOVE.B  #227,D7              ; output CR+LF
        TRAP    #14
        MOVEM.L (A7)+,A0-A6/D1-D7
        RTS