This page is still very much a work in progress; I update it every now and then when I'm not focusing on programming. ;)

Last Updated 2017/04/17:

It's been a long time... No, I didn't disappear. I've had my hands full with other things.

That's it for now... A certain demo that appeared at a certain demoparty has me wanting to violently switch directions after the announcement of a certain videogame forced me into another direction entirely (hence the absence).


Stuff I wrote, or had a hand in developing. You should also check out the general utilities page for more tools.

Documents, Guides, etc.





Examples and Other Stuff

Tool Binaries


vasm is a portable and retargetable assembler. Ideally, you should compile it yourself, but I recognize that's not always possible for everyone. v1.7h is the current "release" version as of 2017/02/06.

Older Versions/68000 with Motorola Syntax

Older Versions/Z80 with oldstyle Syntax


vlink is a portable linker. Much like vasm, you are expected to compile the binaries yourself... v0.15d is the current release version as of 2017/02/06.

Older Versions

byteswap (Hans Vahlenkamp)

Before I ported ROMWak, I searched the Internet for some open source tools, including a byte swapping utility. I found one that fit the bill and am providing it here, just in case.

Future Plans

No promises on release dates for any of these.


This page by AJ/freem, 2014-2017.
"NEOGEO" is a registered trademark of SNK Playmore Corp. All other company and product names used are trademarks or registered trademarks of their respective owners.
The contents of this page are not authorized or licensed by SNK Playmore.