Commodore 64 Assembler for Windows!
W64Asm Help
Version 1.0 Beta
8-5-06
----------------------------------------------------------------------------------------------
File.
New Source. Creates a new source for editing.
Load Source. Loads a source for editing,.txt or .asm
Merge Source Into File. Merge a source file in to editor at current postion.
Merge Prg Into Source. Merge a Prg file into editor as data statments
Merge Binary Into Source. Merge a binary file into editor as data statments
Save Source. Save the current source file,.txt or .asm
Save Selected Text. Save the selected text as a source file,.txt or .asm
Quit. Leave the assembler.
----------------------------------------------------------------------------------------------
Edit.
Undo. Undo last action.
Redo. Redo last action.
Cut. Cut the selected text to system clipboard.
Copy. Copy the selected text to system clipboard.
Paste. Paste the current contents of clipboard to editor.
Select All. Selects all the text in editor.
Select Text Colour. Select a new text colour.
Select Background Colour. Select a new background colour.
Select Font Select a new font for use in editor.
----------------------------------------------------------------------------------------------
Assemble.
Assemble Into Prg Assemble current source into a prg file.
Assemble Into P00 Assemble current source into a p00 file.
----------------------------------------------------------------------------------------------
Help.
Help. This.
C64 Memory Map. Display a c64 Memory Map.
----------------------------------------------------------------------------------------------
Using the assembler.
The start address should be set as follows.
*=$0800 or *=2048
----------------------------------------------------------------------------------------------
Comments.
All text found to the right of a semi colon ; will be ignored.
lda #$ff ;load 255 into a
----------------------------------------------------------------------------------------------
Labels Should have either a space or tab after them,and not be a op name(LDA Ect).
Labels should be placed against either an instruction or a byte/word/text/dword data type.
start lda #0
Label rts
*=$0800 ;set start at $0800
ipcvalue byte $ff ;set a label against a byte/data value
clc ;code start
lda ipcvalue ;load value that label is marked against,in this case $ff,255
ldx 0 ;copy values
loop lda table,x
sta $c000,x
inx
cmp 0
bne loop
rts
;
table byte 1,2,3,0
PLEASE NOTE
Do not use TEXT,WORD,DBYTE,BYTE as lables such as
ldx #$00
back lda text,x
sta $c000,x
inx
bne back
rts
;
text "abc"
;
Much better
ldx #$00
back lda tdat,x
sta $c000,x
inx
bne back
rts
;
tdat text "abc"
;
----------------------------------------------------------------------------------------------
Variables should be defined such as.
val=1 Decimal
val=$1 hex
val=%00000001 binary
val="a" ascii
val=`a` screen code,this only works for a-z and a few others
Or you can do somting like
value=$d015
lda 0
sta value
will be
lda 0
sta $d015
Or
Base=49152
lda 0
tax
loop sta base,x
inx
bne loop
rts
Should be
lda 0
tax
loop sta $c000
inx
bne loop
rts
If you want to access a zero page location just do
val=1
lda val
ora 1
sta val
will be
lda $01
ora #$01
sta $01
if you define variables
a=1
Or
a=$1
Or
a=%00000001
and then you do
lda a
sta a
it will be the same as
lda $01
sta $01
if you wish your variables to have the same effect as an immidiate load (LDA #$ff)
when you define the variable simple preceed with a hash,such as
a=#$ff
Or
a=#255
Or
a=#%11111111
lda a
will be
lda #$ff (immidiate)
----------------------------------------------------------------------------------------------
Data values.
Byte,word supported
8 bit data can be entered as follows.
byte 0,1,2,3,4,5 decimal
byte $ff,$ff hex
byte %00001111,%00001111 binary
You can mix such as
byte "a",123,$ff,`d`,%00001111
Or
text "a","b" ascii character
text `a`,`b` screen display code
But if using a string of chars,please only use 1 string per line(To be fixed)
text "abcdef" string of ascii--only use 1 string per line
text `abcdef` string of screen codes--only use 1 string per line
Also highbyte/lowbyte finding.
byte >4096 =16 highbyte
byte <$ff0a=10 lowbyte
byte >4096 =16
Also supports 16 bit word values
word %1111111100000001
word 53280
word $c000
Or if you enter
word $ff
This will be placed in memeory as $ffff
Also supports dbyte values
dbyte $ff01
will be stored in reverse order as
$01,$ff
----------------------------------------------------------------------------------------------
Including other files.
include "file.txt"
This will include another source file at assemlbe time,must be in same dir/folder as W64asm
include ""
This will include another source file at assemlbe time,but will open a requester
allowing you to chose which file to include.
includebinary "file.bin" will include a binary file,that must be in same dir/folder.
includebinary "" opens a requester for binary file include.
includeprg "file.prg" will include a PRG file,that must be in same dir/folder.
(Please not the first to bytes that hold the file`s start address will not be included).
includeprg ""
This will open a requester allowing you to choose a PRG file to include.
(Please not the first to bytes that hold the file`s start address will not be included).
----------------------------------------------------------------------------------------------
finding highbyte/lowbyte
a=$09ff
lda >a
ldx start
ldx
