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incCartInitiate.asm
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;*******************************************************************************
;* Cartridge Initialisation Routine *
;* *
;* Written By John C. Dale *
;* *
;* Date 26th October 2020 *
;*******************************************************************************
word CART_RESET
word CART_NMI
TEXT "CBM80"
CART_RESET
stx SCROLX
jsr krljmp_IOINIT$ ; CIA IO Initialisation
jsr krljmp_RAMTAS$ ; Perform RAM Test
jsr krljmp_RESTOR$ ; Restore RAM Vectors
jsr krljmp_PCINT$ ; Initialise Screen Editor and VIC Chip
cli
jsr $E453 ; Copy BASIC Vectors To RAM.
jsr $E3BF ; Initialise BASIC
jsr $E422 ; Print BASIC StartUp Screen
ldx #$FB ; Load Stack Pointer Start Value
txs ; Transfer To Stack Pointer
jsr COPY_CART
lda #<NMI_TEXT+1 ; Load Lo Byte of My Banner
ldy #>NMI_TEXT ; Load Hi Byte of My Banner
jsr bas_PrintString$ ; Prints out My Banner
jsr START ; GoSub my Start Routine
jmp NMI_EXIT ; NMI Exit Point
NMI_TEXT
BYTE CHR_ClearScreen
BYTE CHR_CursorDown
;COLS"1234567890123456789012345678901234567890"
TEXT "oldskoolcoder basic for the commodore 64"
BYTE CHR_CursorDown
TEXT "oskbasic v2.020a (c) 2020 oldskoolcoder"
brk
CART_NMI
jsr $F6BC ;
jsr krljmp_STOP$ ; Check Stop Key
beq @NMI
jmp $FE72 ; NMI RS232 Handler
@NMI
jsr krljmp_RESTOR$ ; Restore RAM Vectors
jsr krljmp_IOINIT$ ; CIA IO Initialisation
jsr krljmp_PCINT$ ; Initialise Screen Editor and VIC Chip
jsr krljmp_CLRCHN$ ; Restore Input and Output Channels
lda #$00
sta $13
jsr bas_CLRCommand$ ; Performing a BASIC CLR
cli
lda #<NMI_TEXT ; Load Lo Byte of My Banner
ldy #>NMI_TEXT ; Load Hi Byte of My Banner
jsr bas_PrintString$ ; Prints out My Banner
jsr START ; GoSub my Start Routine
NMI_EXIT
ldx #128
jmp (jmpvec_Error)
;*******************************************************************************
;* Start Routine *
;*******************************************************************************
START
ldy #0
VEC
lda MAP_VECTOR,y
sta jmpvec_Error,y
iny
cpy #12
bne VEC
lda #>CARTSTART-1 ; Protects Graphics BASIC From BASIC Corruption
sta 56
sta 54
sta 52
lda #<CARTSTART
sta 55
sta 53
sta 51
lda #1
sta COMM_GRAPHIC_COLOUR
lda #0
sta COMM_ERASE_ENABLED
jmp $A663 ; Perform NEW Command
MAP_VECTOR
;word $e38B
word VEC_ErrorHandler
word $A483
word VEC_TOKAN ; Tokan Jump
word VEC_LISTER
word VEC_BYEBYE
;word $A7E4
word VEC_EVALMY
;word $AE86
COPY_CART
lda #0
sta RIBUF
lda #$80
sta RIBUF + 1
GRAP
ldy #0
GRAP_Loop
lda (RIBUF),y
sta (RIBUF),y
iny
bne GRAP_Loop
inc RIBUF + 1
lda RIBUF + 1
cmp #$A0
bne GRAP
rts