mirror of
https://github.com/andrew-jacobs/emu816.git
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256 lines
15 KiB
Plaintext
256 lines
15 KiB
Plaintext
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Portable 65xx Assembler [16.06]
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;===============================================================================
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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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;===============================================================================
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; __ ____ ____ ____ ___ _ __
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; \ \ / / /_| ___| / ___( _ )/ |/ /_
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; \ \ /\ / / '_ \___ \| | / _ \| | '_ \
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; \ V V /| (_) |__) | |__| (_) | | (_) |
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; \_/\_/ \___/____/ \____\___/|_|\___/
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;
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; Western Design Center W65C816 device definitions
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;-------------------------------------------------------------------------------
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; Copyright (C)2015 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-ShareAlike 4.0 International license. Open the
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; following URL to see the details.
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;
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; http://creativecommons.org/licenses/by-nc-sa/4.0/
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;
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;===============================================================================
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; Notes:
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;
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; Various macros and definitions for the W65C816 microcontroller.
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;
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;===============================================================================
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; Revision History:
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;
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; 2015-12-18 AJ Initial version
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;-------------------------------------------------------------------------------
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; $Id$
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;-------------------------------------------------------------------------------
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.65816
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Portable 65xx Assembler [16.06]
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;===============================================================================
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; Status Register Bits
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;-------------------------------------------------------------------------------
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00000080 = N_FLAG .equ 1<<7
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00000040 = V_FLAG .equ 1<<6
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00000020 = M_FLAG .equ 1<<5
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00000010 = X_FLAG .equ 1<<4
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00000010 = B_FLAG .equ 1<<4
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00000008 = D_FLAG .equ 1<<3
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00000004 = I_FLAG .equ 1<<2
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00000002 = Z_FLAG .equ 1<<1
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00000001 = C_FLAG .equ 1<<0
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;==============================================================================
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; Macros
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;------------------------------------------------------------------------------
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; Puts the processor in emulation mode. A, X and Y become 8-bits and the stack
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; is fixed at $0100-$01ff.
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emulate .macro
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sec
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xce
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.endm
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; Puts the processor in native mode. The size of the memory and index register
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; operations is not controlled by the M & X bits in the status register.
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native .macro
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clc
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xce
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.endm
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; Resets the M bit making the accumator and memory accesses 16-bits wide.
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long_a .macro
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rep #M_FLAG
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.longa on
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.endm
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; Resets the X bit making the index registers 16-bits wide
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long_i .macro
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rep #X_FLAG
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.longi on
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.endm
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; Resets the M and X bits making the accumator, memory accesses and index
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; registers 16-bits wide.
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long_ai .macro
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rep #M_FLAG|X_FLAG
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.longa on
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Portable 65xx Assembler [16.06]
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.longi on
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.endm
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; Sets the M bit making the accumator and memory accesses 16-bits wide.
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short_a .macro
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sep #M_FLAG
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.longa off
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.endm
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short_i .macro
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sep #X_FLAG
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.longi off
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.endm
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short_ai .macro
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sep #M_FLAG|X_FLAG
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.longa off
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.longi off
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.endm
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.page0
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;===============================================================================
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; Memory Areas
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;-------------------------------------------------------------------------------
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00:0000' 0000000000000000> : .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 $f000
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.longa off
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.longi off
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RESET:
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00:F000 78 : sei
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00:F001 D8 : cld
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native
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00:F002 18 + clc
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00:F003 FB + xce
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long_ai
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00:F004 C230 + rep #M_FLAG|X_FLAG
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+ .longa on
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+ .longi on
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00:F006 A9???? : lda #STACK
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00:F009 1B : tcs
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00:F00A A00200 : ldy #2
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Portable 65xx Assembler [16.06]
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repeat
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00:F00D A27B00 : ldx #123
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repeat
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00:F010 CA : dex
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00:F011 D0FD : until eq
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00:F013 88 : dey
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00:F014 D0F7 : until eq
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00:F016 42FF : wdm #$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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00:F018 80FE : 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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00:F01A 80FE : bra $
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;===============================================================================
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; Vectors
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;-------------------------------------------------------------------------------
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.org $ffe0
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00:FFE0 00000000 : .space 4 ; Reserved
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00:FFE4 18F0 : .word COPN ; $FFE4 - COP(816)
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00:FFE6 18F0 : .word BRKN ; $FFE6 - BRK(816)
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00:FFE8 18F0 : .word ABORTN ; $FFE8 - ABORT(816)
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00:FFEA 18F0 : .word NMIN ; $FFEA - NMI(816)
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00:FFEC 0000 : .space 2 ; Reserved
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00:FFEE 18F0 : .word IRQN ; $FFEE - IRQ(816)
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00:FFF0 00000000 : .space 4
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00:FFF4 1AF0 : .word COP ; $FFF4 - COP(C02)
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00:FFF6 0000 : .space 2 ; $Reserved
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00:FFF8 1AF0 : .word ABORT ; $FFF8 - ABORT(C02)
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00:FFFA 1AF0 : .word NMI ; $FFFA - NMI(C02)
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00:FFFC 00F0 : .word RESET ; $FFFC - RESET(C02)
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00:FFFE 1AF0 : .word IRQBRK ; $FFFE - IRQBRK(C02)
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.end
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Portable 65xx Assembler [16.06]
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Symbol Table
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ABORT 0000F01A | __6501__ 00000000
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ABORTN 0000F018 | __6502__ 00000000
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BRKN 0000F018 | __65832__ 00000000
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B_FLAG 00000010 | __65C02__ 00000000
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COP 0000F01A | __65SC02__ 00000000
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COPN 0000F018 | C_FLAG 00000001
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C_FLAG 00000001 | __65816__ 00000001
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D_FLAG 00000008 | Z_FLAG 00000002
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IRQBRK 0000F01A | I_FLAG 00000004
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IRQN 0000F018 | D_FLAG 00000008
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I_FLAG 00000004 | B_FLAG 00000010
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M_FLAG 00000020 | X_FLAG 00000010
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NMI 0000F01A | M_FLAG 00000020
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NMIN 0000F018 | V_FLAG 00000040
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N_FLAG 00000080 | N_FLAG 00000080
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RESET 0000F000 | STACK 00000080'
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STACK 00000080' | RESET 0000F000
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V_FLAG 00000040 | ABORTN 0000F018
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X_FLAG 00000010 | BRKN 0000F018
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Z_FLAG 00000002 | COPN 0000F018
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__6501__ 00000000 | IRQN 0000F018
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__6502__ 00000000 | NMIN 0000F018
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__65816__ 00000001 | ABORT 0000F01A
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__65832__ 00000000 | COP 0000F01A
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__65C02__ 00000000 | IRQBRK 0000F01A
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__65SC02__ 00000000 | NMI 0000F01A
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