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49 lines
1.2 KiB
NASM
49 lines
1.2 KiB
NASM
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; this program adds 2 floats 1.2345 + 4.4444 and prints the result 5.67879
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; it works fine on C64 and CX16 but fails to add the right number on C128
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; I think it has something to do with the banking on the C128
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; because several rom fp routines mention "value in bank 1"
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; but I don't know what this means and why the program as given doesn't work
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.cpu '6502'
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* = $1300 ; sys 4864
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P8ZP_SCRATCH_W1 = 251 ; free zp word
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CHROUT = $ffd2
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; c128:
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MOVFM = $af63
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FADD = $af18
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FOUT = $af06
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;cx16:
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;MOVFM = $fe42
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;FADD = $fe12
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;FOUT = $fe7b
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;c64:
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;MOVFM = $bba2
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;FADD = $b867
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;FOUT = $bddd
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lda #<f1
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ldy #>f1
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jsr MOVFM ; load FAC1
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lda #<f2
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ldy #>f2
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jsr FADD ; add mem float to FAC1 DOESN'T WORK ON C128!?
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jsr FOUT ; convert to string
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sta P8ZP_SCRATCH_W1
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sty P8ZP_SCRATCH_W1+1
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ldy #0
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_printloop lda (P8ZP_SCRATCH_W1),y
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beq _done
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jsr CHROUT
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iny
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bne _printloop
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_done jmp _done
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f1 .byte $81, $1e, $04, $18, $93 ; float 1.2345
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f2 .byte $83, $0e, $38, $86, $59 ; float 4.4444
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