Here are the pseudo opcodes that can be used in Mikro Assembler:
The BYT opcode is used to store a byte value in memory. It takes one or more comma-separated values as its argument, each representing a byte to be stored in memory.
Example:
100 BYT $01,2,'A,"BCD"
This will store the values $01, $02, $41, $42, $43 and $44 in memory at the current location.
The END opcode marks the end of the assembly file. Any code afterwards will not be assembled.
Example:
100 END
The LNK opcode is used to link multiple Mikro Assembler source files together. This allows the assembler to handle longer programs by breaking them up into smaller, more manageable files. The syntax is similar to the LOAD command in BASIC.
Example:
500 LNK "PART TWO",8
You must use the END command in the last file to link the assembler back to the first one. The END command should include the name of the first file and its device number.
; PART ONE
...
500 LNK "PART TWO",8
; PART TWO
...
900 END "PART ONE",8
The OFF opcode is used to stop the output from the OUT opcode during assembly.
Example:
10 OUT
...
200 OFF
This will stop assembly output from being displayed.
The OUT pseudo-opcode is used to output the subsequent code with its assembled code to a specified device during assembly. If no device number is specified, the output will be displayed on the screen.
To specify the device number, use the value associated with the device according to the C64-Wiki.
If the device is a printer that does not automatically perform a line feed, add 128 to the device number.
Example:
100 OUT 4
This will output the assembled code to device number 4, which is typically the first printer.
The TXT opcode is used to store a string of characters in memory.
Example:
100 TXT "HELLO, WORLD!"
This will store the ASCII values of the string "HELLO, WORLD!" in memory.
The WOR opcode is used to store a 16-bit word in memory, low byte first. It takes one or more comma-separated values as its argument, each representing a word to be stored in memory.
Example:
100 WOR $1234, $5678
This will store the values $1234 and $5678 in memory as $34 $12 $78 $56.
The * opcode is used to get or set the current memory position.
To set the current memory position for the assembly code to $C000:
10 *=$C000
To advance the current memory position by 1024 bytes:
300 *=*+1024
To store the current memory position into the POSITION label:
100 POSITION=*