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118 lines
2.4 KiB
ArmAsm
118 lines
2.4 KiB
ArmAsm
.segment "IP65ZP" : zeropage
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; pointers for copying
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copy_src: .res 2 ; source pointer
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copy_dest: .res 2 ; destination pointer
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end: .res 1
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.segment "STARTUP" ;this is what gets put at the start of the file on the C64
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.word basicstub ; load address
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.include "../inc/common.i"
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basicstub:
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.word @nextline
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.word 2003
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.byte $9e
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.byte <(((init / 1000) .mod 10) + $30)
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.byte <(((init / 100 ) .mod 10) + $30)
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.byte <(((init / 10 ) .mod 10) + $30)
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.byte <(((init ) .mod 10) + $30)
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.byte 0
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@nextline:
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.word 0
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init:
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;clear screen
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lda #147 ; 'CLR/HOME'
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jsr $ffd2
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;turn off BASIC
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lda $01
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and #$FE ;mask out bit 0
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sta $01
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;now relocate the cart
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ldax #cart_data
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stax copy_src
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ldax #$8000
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stax copy_dest
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ldax #$4000
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jsr copymem
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;if this is a KIPPERKART, then set default drive to
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;be whatever we just booted from
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lda $8009
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cmp #'K'
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bne @drive_done
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lda $8009
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cmp #'K'
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bne @drive_done
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lda $8036 ;location in cart config of default drive
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cmp #08
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bne @drive_done
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lda $ba
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sta $8036
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@drive_done:
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jmp ($8002) ;warm start vector
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;copy memory
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;inputs:
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; copy_src is address of buffer to copy from
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; copy_dest is address of buffer to copy to
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; AX = number of bytes to copy
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;outputs: none
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copymem:
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sta end
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ldy #0
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cpx #0
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beq @tail
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: lda (copy_src),y
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sta (copy_dest),y
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iny
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bne :-
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inc copy_src+1 ;next page
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inc copy_dest+1 ;next page
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dex
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bne :-
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@tail:
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lda end
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beq @done
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: lda (copy_src),y
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sta (copy_dest),y
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iny
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cpy end
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bne :-
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@done:
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rts
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;this is where the cart data will be appended to:
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cart_data:
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;-- LICENSE FOR c64_cart_ram_header.s --
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; The contents of this file are subject to the Mozilla Public License
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; Version 1.1 (the "License"); you may not use this file except in
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; compliance with the License. You may obtain a copy of the License at
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; http://www.mozilla.org/MPL/
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;
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; Software distributed under the License is distributed on an "AS IS"
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; basis, WITHOUT WARRANTY OF ANY KIND, either express or implied. See the
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; License for the specific language governing rights and limitations
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; under the License.
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;
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; The Original Code is netboot65.
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;
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; The Initial Developer of the Original Code is Jonno Downes,
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; jonno@jamtronix.com.
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; Portions created by the Initial Developer are Copyright (C) 2009
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; Jonno Downes. All Rights Reserved.
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; -- LICENSE END --
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