mirror of
https://github.com/a2stuff/prodos-drivers.git
synced 2024-12-21 14:29:18 +00:00
49 lines
1.2 KiB
ArmAsm
49 lines
1.2 KiB
ArmAsm
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.setcpu "6502"
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.linecont +
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.feature string_escapes
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.include "apple2.inc"
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.include "apple2.mac"
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.include "../inc/apple2.inc"
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.include "../inc/macros.inc"
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.include "../inc/prodos.inc"
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;;; ************************************************************
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.include "../inc/driver_preamble.inc"
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;;; ************************************************************
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.proc maybe_install_driver
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;; Find the current device's index in the list
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ldx #0
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: lda DEVLST,x
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and #$F0
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cmp DEVNUM
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beq found
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inx
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cpx DEVCNT
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bcc :-
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bcs exit ; last one or not found
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;; Save it
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found: ldy DEVLST,x
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;; Move everything up
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: lda DEVLST+1,x
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sta DEVLST,x
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inx
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cpx DEVCNT
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bne :-
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;; Place it at the end
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tya
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sta DEVLST,x
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exit: rts
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.endproc
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;;; ************************************************************
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.include "../inc/driver_postamble.inc"
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;;; ************************************************************
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