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35 lines
828 B
Plaintext
35 lines
828 B
Plaintext
;-------------------------------
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; Trace
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; common code for all boot tracers
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; in: A = lo byte of callback
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; X = hi byte of callback
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; never returns (exits via callback or UseUniversal)
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;-------------------------------
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!zone {
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Trace
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pha
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txa
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pha
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lda #$C6
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ldx #$16
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jsr CopyMemory1
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pla
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ldx #0
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ldy $16F8
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cpy #$4C
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beq +
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ldx #3
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ldy $16FB
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cpy #$4C
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bne ++
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+ sta $16FA,x ; hi byte of callback
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pla
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sta $16F9,x ; lo byte of callback
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jmp $1600
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++ pla
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jsr PrintByID ; unknown disk controller
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!byte s_canttrace
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; /!\ execution falls through here to UseUniversal
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}
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