Five Most Wanted

HP 2000ASR-33APF Imagination MachineHeathkit H11Enterprise 64

Welcome to The Trailing Edge

This site is devoted to computing technology which has been left behind by the rapidly advancing Leading Edge of computing. Many interesting and useful systems have been forgotten with the mad rush to stay on the Cutting Edge and maintain the high sales of hardware and software companies. While we too like to have the latest and greatest, we don't want people to forget the legacy which lead to today's systems. Many of these older systems were once considered part of the Bleeding Edge but most people know little if anything about them or just dismiss them. If you have some item related to these old systems that you'd like to clear out or just want to say hello and share some story about them, you can email me at

If you are looking for the used PC store in Canada, this is not it. What you are looking for is here.

Recent News

2024-04-11Minor Updates
Just doing some minor updates on the site in preparation of future enhancements. Also added a few pictures for systems that were missing them.

2022-09-28MTU-130 and MAME
Happy to announce that MAME now has a working MTU-130 emulation! Been working towards this day for some time and it is finally here. You can now start to explore some of the features of this interesting and rare 6502 based system now as well as the 68000 addon card. Working on additional hardware to be emulated as well as recovering more documentation and software so should have more updates soon.

2022-09-09MTU-130 Updates
Added some more documentation to the MTU-130 resource section. Also have some hopefully big news related to the MTU-130 coming around the end of the month so check back then.

2022-03-03More resources
Added more PDFs to the Apple 2 and the MTU-130 resource section.

2021-11-24MTU-130 Updates
I've been able to gather all my MTU-130 hardware, software and documentation together again in one place. I've begun to catalog all of it in preparation to scan/image/document everything. You can see the current catalog of documentation and software here.

Site Copyright © 1997 - 2024 David Williams