more sane directory name, updated binaries
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@@ -0,0 +1,4 @@
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Original Kernal location of the RESTOR routine.
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Routine moved to original location due to game 'Duotris' calling it instead of using the Kernal jumptable.
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Starting the game without this patch caused warm reset with 'BRK AT $FD15' message.
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@@ -0,0 +1,27 @@
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// #LAYOUT# STD * #TAKE
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// #LAYOUT# * KERNAL_0 #TAKE
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// #LAYOUT# * * #IGNORE
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//
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// Official Kernal routine, described in:
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//
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// - [RG64] C64 Programmers Reference Guide - page 293 (RESTOR), 304 (VECTOR)
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// - [CM64] Computes Mapping the Commodore 64 - page 237
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//
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// CPU registers that has to be preserved (see [RG64]): none
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//
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RESTOR:
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clc // clear carry - for writing to system table
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ldy #>vector_defaults
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ldx #<vector_defaults
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// FALLTHROUGH
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VECTOR:
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// Our implementation is longer than the original one,
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// placing it here would cause a collision with VECTOR defaults
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jmp vector_real
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@@ -0,0 +1,3 @@
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Address adjusted to support $FE2D - routine which is probably used by many cartridges and other software to initialize parts of the system. At least the UCart uses it - see here:
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- https://www.elektroda.pl/rtvforum/topic3293027.html
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@@ -0,0 +1,28 @@
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// #LAYOUT# STD * #TAKE
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// #LAYOUT# * KERNAL_0 #TAKE
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// #LAYOUT# * * #IGNORE
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//
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// Official Kernal routine, described in:
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//
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// - [RG64] C64 Programmers Reference Guide - page 288
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// - [CM64] Computes Mapping the Commodore 64 - page 240
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//
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// CPU registers that has to be preserved (see [RG64]): .A
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//
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MEMTOP:
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bcc memtop_set
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ldy MEMSIZK+1
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ldx MEMSIZK+0
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// FALLTROUGH
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memtop_set: // for compatibility reasons this has to start at $FE2D
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sty MEMSIZK+1
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stx MEMSIZK+0
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rts
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@@ -0,0 +1,28 @@
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// #LAYOUT# STD * #TAKE
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// #LAYOUT# * KERNAL_0 #TAKE
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// #LAYOUT# * * #IGNORE
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//
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// Official Kernal routine, described in:
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//
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// - [RG64] C64 Programmers Reference Guide - page 287/288
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// - [CM64] Computes Mapping the Commodore 64 - page 240
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//
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// CPU registers that has to be preserved (see [RG64]): .A
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//
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MEMBOT:
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bcc membot_set
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ldy MEMSTR+1
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ldx MEMSTR+0
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// FALLTROUGH
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membot_set:
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sty MEMSTR+1
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stx MEMSTR+0
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rts
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@@ -0,0 +1,85 @@
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// #LAYOUT# STD * #TAKE
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// #LAYOUT# * KERNAL_0 #TAKE
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// #LAYOUT# * * #IGNORE
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#if CONFIG_MEMORY_MODEL_46K ||CONFIG_MEMORY_MODEL_50K
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peek_under_roms_via_MEMUSS:
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// Store current memory mapping, unmap BASIC ROM
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lda CPU_R6510
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pha
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and #$FE
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sta CPU_R6510
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// Retrieve value from under ROMs
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lda (MEMUSS), y
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// FALLTROUGH
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peek_under_roms_finalize:
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// Store value in a safe place
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tax
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// Restore memory mapping
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pla
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sta CPU_R6510
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// Retrieve value and quit
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txa
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rts
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peek_under_roms_via_FNADDR:
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// Store current memory mapping, unmap BASIC ROM
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lda CPU_R6510
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pha
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and #$FE
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sta CPU_R6510
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// Retrieve value from under ROMs
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lda (FNADDR), y
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// Continue using common code
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#if HAS_OPCODES_65C02
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bra peek_under_roms_finalize
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#else
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jmp peek_under_roms_finalize
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#endif
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peek_under_roms_via_EAL:
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// Store current memory mapping, unmap BASIC ROM
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lda CPU_R6510
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pha
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and #$FE
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sta CPU_R6510
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// Retrieve value from under ROMs
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lda (EAL), y
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// Continue using common code
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#if HAS_OPCODES_65C02
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bra peek_under_roms_finalize
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#else
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jmp peek_under_roms_finalize
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#endif
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#endif
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@@ -0,0 +1,74 @@
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// #LAYOUT# STD * #TAKE
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// #LAYOUT# * KERNAL_0 #TAKE
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// #LAYOUT# * * #IGNORE
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#if CONFIG_MEMORY_MODEL_60K
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// IMPORTANT:
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// These routines lengths cannot be changed without changing
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// the aliases for peek_under_roms, poke_under_roms, etc.
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// Thus those addresses are expressed using formulae.
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install_ram_routines:
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// Copy routines into place
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ldx #__ram_routines_end-__ram_routines_start-1
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!:
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lda __ram_routines_start,x
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sta tiny_nmi_handler,x
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dex
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bpl !-
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// Point NMI handler to tiny_nmi_handler
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lda #<tiny_nmi_handler
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sta $FFFE
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lda #>tiny_nmi_handler
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sta $FFFF
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rts
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__ram_routines_start:
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tiny_nmi_handler_routine:
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inc missed_nmi_flag
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rti
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peek_under_roms_routine:
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php
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// Offset of arg of lda ($00),y
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stx peek_under_roms+pa-peek_under_roms_routine+1
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jsr memmap_allram
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pa: lda ($00),y
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jsr memmap_normal
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plp
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rts
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poke_under_roms_routine:
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php
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// Offset of arg of lda ($00),y
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stx poke_under_roms+pb-poke_under_roms_routine+1
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jsr memmap_allram
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pb: sta ($00),y
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jsr memmap_normal
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plp
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rts
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memmap_normal_routine:
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pha
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lda #$37
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sta $01
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pla
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rts
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memmap_allram_routine:
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sei
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pha
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lda #$04
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sta $01
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pla
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rts
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__ram_routines_end:
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#endif
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@@ -0,0 +1,48 @@
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// #LAYOUT# STD * #TAKE
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// #LAYOUT# * KERNAL_0 #TAKE
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// #LAYOUT# * * #IGNORE
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vector_real:
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// Use MEMUSS as temporary storage location - checked on real C64 that this is the
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// address originally used; after calling VECTOR and checking zero page
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// area afterwards, the address could be found there
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// According to 'Computes Mapping the Commodore 64' page 237,
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// the CBM implementation does not disable IRQs - yet, the
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// 'C64 Programmers Reference Guide' does not contain such
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// warning and does not mention any preparations needed.
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// Initial idea was to do php, cli, ..., plp to make the routine safer,
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// but it seems it might cause problem with initialization on XEMU emulator
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// XXX find out, why
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// Prepare the user data pointer - strange order to reduce risk
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// of potential similarity to the original routine
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sty MEMUSS + 1
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stx MEMUSS + 0
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lda #$00
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sta NMINV + 1 // our routine considers this a disabled interrupt
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// Select routine variant - store or restore vectors
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ldy #$1F
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bcc vector_restore
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lda CINV, y
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sta (MEMUSS), y
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bcs vector_end_loop // branch always
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vector_restore:
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lda (MEMUSS), y
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sta CINV, y
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// FALLTROUGH
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vector_end_loop:
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dey
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bpl vector_restore
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rts
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