Random Number Generator Engine

SYS05DD: MOV AX,[RandSeed.Low]
SYS05E0: MOV BX,[RandSeed.High]

Load RandomSeed (LongInt) into BX:AX.

SYS05E4: MOV CX,AX
SYS05E6: CS:
SYS05E7: MUL WORD PTR [0613]
SYS05EB: SHL CX,1
SYS05ED: SHL CX,1
SYS05EF: SHL CX,1
SYS05F1: ADD CH,CL
SYS05F3: ADD DX,CX
SYS05F5: ADD DX,BX
SYS05F7: SHL BX,1
SYS05F9: SHL BX,1
SYS05FB: ADD DX,BX
SYS05FD: ADD DH,BL
SYS05FF: MOV CL,05
SYS0601: SHL BX,CL
SYS0603: ADD DH,BL
SYS0605: ADD AX,0001
SYS0608: ADC DX,+00

SYS060B: MOV [RandSeed.Low],AX
SYS060E: MOV [RandSeed.High],DX

Update RandSeed (LongInt) with DX:AX.

SYS0612: RET

Return to calling Random function (Real/Int). Because it returns with a NEAR RET, it can only be called from within the system library.

SYS0613: 05 84

Magic Number 8405h/33797. Used internally.

See also: RandSeed, or go back