mirror of
https://github.com/zellyn/diskii.git
synced 2024-11-21 23:31:47 +00:00
65 lines
932 B
NASM
65 lines
932 B
NASM
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* = $6000
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START = *
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;; Free addresses: 6, 7, 8, 9
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IOB = $6
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RWTS = $3D9
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GET_IOB = $3E3
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BUF = $6100
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start:
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; set up IOB address
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jsr GET_IOB
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sta IOB+1
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sty IOB
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lda #$f
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outer:
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ldy #0
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inner:
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sta BUF,Y
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iny
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bne inner
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pha
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jsr write
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pla
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tax
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dex
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txa
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bpl outer
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rts
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write:
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ldy #$5 ; sector number
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sta ($6), Y
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ldy #$2 ; drive number
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lda #$2 ; drive 2
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sta ($6), Y
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iny ; 3: volume
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lda #0 ; any volume
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sta ($6), Y
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iny ; 4: track
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sta ($6), Y
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ldy #$8 ; LO of buffer
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lda #<BUF
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sta ($6), Y
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iny ; $9: HI of buffer
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lda #>BUF
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sta ($6), Y
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iny ; $A: unused
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iny ; $B: Byte count
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lda #0
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sta ($6),Y
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iny ; $C: command
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lda #$02 ; write
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sta ($6),Y
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lda IOB+1
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ldy IOB
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jsr RWTS
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rts
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