99 lines
2.6 KiB
NASM
99 lines
2.6 KiB
NASM
;===============================================================================
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;
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; A Simple W65C816 Program
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;-------------------------------------------------------------------------------
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; Copyright (C),2016 HandCoded Software Ltd.
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; All rights reserved.
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;
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; This work is made available under the terms of the Creative Commons
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; Attribution-NonCommercial 2.0 license. Open the following URL to see the
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; details.
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;
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; http://creativecommons.org/licenses/by-nc/2.0/
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;-------------------------------------------------------------------------------
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;
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; Notes:
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;
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;
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;
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;-------------------------------------------------------------------------------
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.include "../w65c816.inc"
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.page0
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;===============================================================================
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; Memory Areas
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;-------------------------------------------------------------------------------
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.space 128
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STACK: ; Top of stack area
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;===============================================================================
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; Power On Reset Handler
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;-------------------------------------------------------------------------------
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.code
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.org $f000
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.longa off
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.longi off
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RESET:
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sei
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cld
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native
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long_ai
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lda #STACK
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tcs
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ldy #2
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repeat
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ldx #123
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repeat
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dex
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until eq
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dey
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until eq
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wdm #$ff
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;===============================================================================
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; Dummy Interrupt Handlers
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;-------------------------------------------------------------------------------
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IRQN:
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COPN:
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ABORTN:
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NMIN:
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BRKN
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bra $
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COP:
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ABORT:
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NMI:
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IRQBRK:
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bra $
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;===============================================================================
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; Vectors
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;-------------------------------------------------------------------------------
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.org $ffe0
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.space 4 ; Reserved
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.word COPN ; $FFE4 - COP(816)
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.word BRKN ; $FFE6 - BRK(816)
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.word ABORTN ; $FFE8 - ABORT(816)
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.word NMIN ; $FFEA - NMI(816)
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.space 2 ; Reserved
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.word IRQN ; $FFEE - IRQ(816)
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.space 4
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.word COP ; $FFF4 - COP(C02)
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.space 2 ; $Reserved
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.word ABORT ; $FFF8 - ABORT(C02)
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.word NMI ; $FFFA - NMI(C02)
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.word RESET ; $FFFC - RESET(C02)
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.word IRQBRK ; $FFFE - IRQBRK(C02)
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.end |