4cade/src/prelaunch/serpentine.a

;license:MIT
;(c) 2019-2020, 2023 by 4am and qkumba

!cpu 6502
!to "build/PRELAUNCH.INDEXED/SERPENTINE",plain
*=$106

         !source "src/prelaunch/common.a"

         +ENABLE_ACCEL
         +NEW_RESET_VECTOR $3C0
         ldx   #(patch_e-patch)-1
-        lda   patch,x
         sta   $390,x
         dex
         bpl   -
         lda   #$90       ; call patch instead of $4000
         sta   $8C58
         lda   #$03
         sta   $8C59
         lda   #$4C
         sta   $8CEF
         jmp   $43F5      ; decompress and show title
patch !pseudopc $390 {
         +DISABLE_ACCEL
         jsr   $4000
         +ENABLE_ACCEL
         jsr   $8C5A
         +DISABLE_ACCEL
         jmp   $0800
}
patch_e

!if * > $1C0 {
  !error "code is too large, ends at ", *
}