turbo-pascal-assembly

Random(Int): Int Function

Returns a random number (Int/Word, 2 bytes). It takes one Int parameter and returns X in the range: 0 <= X < Int.

SYS0580: CALL 05DD

Call SYS:05DD Random Number Generator Engine.

Stack after SYS:0580

Index	Contents
SP	Return Address (OFFSET)
SP+02	Return Address (SEGMENT)
SP+04	Int parameter

SYS0583: MOV BX,SP
SYS0585: MOV CX,DX
SYS0587: SS:
SYS0588: MUL WORD PTR [BX+04]
SYS058B: MOV AX,CX
SYS058D: MOV CX,DX
SYS058F: SS:
SYS0590: MUL WORD PTR [BX+04]
SYS0593: ADD AX,CX
SYS0595: ADC DX,+00
SYS0598: MOV AX,DX
SYS059A: RETF 0002

See also: RandSeed, SYS:05DD Random Number Generator Engine or go back

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