mirror of
https://github.com/mist64/msbasic.git
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136 lines
2.9 KiB
ArmAsm
136 lines
2.9 KiB
ArmAsm
.segment "CODE"
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; ----------------------------------------------------------------------------
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; "RND" FUNCTION
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; ----------------------------------------------------------------------------
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.ifdef KBD
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RND:
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ldx #$10
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jsr SIGN
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beq LFC26
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bmi LFC10
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lda $87
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ldy $88
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LFBFA:
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sta FAC+2
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sty FAC+1
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LFBFE:
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asl a
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asl a
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eor FAC+2
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asl a
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eor FAC+1
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asl a
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asl a
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asl a
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asl a
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eor FAC+1
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asl a
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rol FAC+2
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rol FAC+1
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LFC10:
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lda FAC+2
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dex
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bne LFBFE
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sta $87
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sta FAC+3
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lda FAC+1
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sta $88
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lda #$80
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sta FAC
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stx FACSIGN
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jmp NORMALIZE_FAC2
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LFC26:
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ldy $03CA
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lda $03C7
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ora #$01
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GOMOVMF:
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bne LFBFA
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.byte $F0
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.else
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; <<< THESE ARE MISSING ONE BYTE FOR FP VALUES >>>
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; (non CONFIG_SMALL)
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CONRND1:
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.byte $98,$35,$44,$7A
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CONRND2:
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.byte $68,$28,$B1,$46
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RND:
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jsr SIGN
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.ifdef CONFIG_CBM_ALL
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bmi L3F01
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bne LDF63
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lda ENTROPY
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sta FAC+1
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lda ENTROPY+4
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sta FAC+2
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lda ENTROPY+1
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sta FAC+3
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lda ENTROPY+5
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sta FAC+4
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jmp LDF88
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LDF63:
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.else
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tax
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bmi L3F01
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.endif
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lda #<RNDSEED
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ldy #>RNDSEED
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jsr LOAD_FAC_FROM_YA
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.ifndef CONFIG_CBM_ALL
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txa
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beq RTS19
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.endif
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lda #<CONRND1
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ldy #>CONRND1
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jsr FMULT
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lda #<CONRND2
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ldy #>CONRND2
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jsr FADD
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L3F01:
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ldx FAC_LAST
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lda FAC+1
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sta FAC_LAST
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stx FAC+1
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.ifdef CONFIG_CBM_ALL
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ldx FAC+2
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lda FAC+3
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sta FAC+2
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stx FAC+3
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LDF88:
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.endif
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lda #$00
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sta FACSIGN
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lda FAC
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sta FACEXTENSION
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lda #$80
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sta FAC
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jsr NORMALIZE_FAC2
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ldx #<RNDSEED
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ldy #>RNDSEED
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GOMOVMF:
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jmp STORE_FAC_AT_YX_ROUNDED
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.endif
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.segment "CHRGET"
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; ----------------------------------------------------------------------------
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; INITIAL VALUE FOR RANDOM NUMBER, ALSO COPIED
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; IN ALONG WITH CHRGET, BUT ERRONEOUSLY:
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; <<< THE LAST BYTE IS NOT COPIED >>>
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; (on all non-CONFIG_SMALL)
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; ----------------------------------------------------------------------------
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GENERIC_RNDSEED:
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.ifndef KBD
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; random number seed
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.ifdef CONFIG_SMALL
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.byte $80,$4F,$C7,$52
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.else
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.ifdef CONFIG_11
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.byte $80,$4F,$C7,$52,$58
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.else
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.byte $80,$4F,$C7,$52,$59
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.endif
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.endif
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.endif
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GENERIC_CHRGET_END:
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