Proper use of disassemblers?

[TheCount]

I dunno what I'm doing wrong, but I never seem to use disassemblers the right way. It's been a long time since I tried, but what I remember is that if I try to disassemble something and use an assembler (I use CDoty's ASM and DISASM) to piece it back together I get unrecognized mnemonic errors all over the command line output Could anyone enlighten me?

[Lazy Bastard]

Which disassembler, which assembler, and what kind of program (elf, exe, 32-bit, 16-bit, etc)?

[TheCount]

The programs I'm trying to use are called asm.exe and disasm.exe. I think the author is Charles Doty. They are meant to use with 68000.

[Lazy Bastard]

Are you modifying a macro of some kind? Occasionally, when an illegal index register name is passed to a macro, you'll receive an "Unrecognized Mnemonic" error when the macro is expanded.

Hmm...I think Doty only made the 68000 assembler set JAS/LD/Maccer...on that note, if you don't have Maccer, I recommend you get it, as it corrects some issues with JAS, and adds some functionality.

Also, a good disassembler for 68000 is the PC port of IRA (Intelligent ReAssembler).

If you like, I can dig up my copy of the JAS/LD/Maccer "suite", as well as the last version of IRA.

On that note, if you can get your hands on a copy of IDA (Pro Advanced, if at all possible), there's a good plugin for it for Genesis/Master Drive ROMs, which I also happen to have a copy of. I suppose I should just add these to the Downloads section.

[Lazy Bastard]

Hmm...it would appear Michael Hope made Maccer, incidentally.

[Chemist]

TheCount, for what do you need a disassembler?

[Lazy Bastard]

I've added the tools I mentoned to the Downloads section.

[MIR]

Isn't the 680xx series a processor made by moterola used in the early Macintosh computers before the AIM (Apple, IBM, Motorola) partnership that brought us the PowerPC processor (known as the G1)? are you disassembling a Macintosh?

[Lazy Bastard]

The 68000 series was used in a wide variety of computers, including Macs, as well as the Sega Genesis/Megadrive, NeoGeo (console version), and a bunch of arcade systems. It's still used today in some applications, and in any case is a good model to study.

[MIR]

That is right and a Sub processor of the G1/2 was used in the N64 (ie project Dolphin as well).

Another one is the TI Z processor. It is used in some of the early handheld consoles and is the proccesor of chose in graphing calculators.