PROSOFT MVI69E-MBS Communication module

The AS command invokes the line assembler of FGA Boot. It can assemble and disassemble all 68020/30/40 mnemonics. When the AS command is invoked, it displays the current address and disassembles the opcode at this location.

After the prompt on the next line, the user can enter one of the following: 1. A valid 680x0 mnemonic. Some addressing modes allow omission of arguments. These addressing modes can be entered by omitting the argument and typing the dividing character ",". Examples: CLR.W ([$1,A0],D0.W,$2) CLR.W ([$1,A0],,$2) CLR.W ([,A0],,) 2. A ’#’ sign followed by the new address changes the address counter to this absolute address

All immediate values, addresses

and offsets used within mnemonics are assumed to be entered in decimal. Hex values have to be specified by a dollar sign ’$’. In addition, binary values can be entered by a preceding percent sign ’%’, octal values by an at sign ’@’. The disassembler displays all values in hex representation. The line assembler accepts also pseudo opcodes of the form DC.B, DC.W, and DC.L to define constant data storage. An ASCII pattern can be stored by using DC.B with the format ’DC.B "text’. All characters after the ’"’ will be interpreted as ASCII characters and stored in memory. The disassembler displays all illegal or unknown opcodes as DC.W.

DI – Disassembler

 Format DI address DI address,count The DI command causes the disassembler to be invoked and displays the mnemonic, starting at the specified address. If the count parameter is given, the specified number of lines (mnemonics) will be displayed. If count is omitted, a full page is displayed on the terminal and the user is prompted to continue disassembly (enter) or to abort (enter any other key). The disassembler supports all 68020/30/40 mnemonics. 

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