Even when things go dark on the Web, their history doesn't. The Internet Wayback Machine is always watching and recording, taking snapshots of sites or their content that's been removed. So long as there's a Wayback, there's a way back, so to speak.
I discovered this yesterday when checking on freeware from AICS Research. The company still supports its HP 3000 users of QueryCalc, but at the moment the feature-rich website has nothing on its face but a static graphic. AICS did business long ago as a tax service, and all the website reports is a gaggle of details about that enterprise.
As 3000 users know, a lot more resided at aics-research.com. In years past, there was a 3000 Relative Performance Chart, an essay to guide users on remaining on the 3000 indefinitely (called Plan B at the time), as well as a rich history of early Hewlett-Packard computing products. But most of all, there was QCTerm, the free 3000 emulator that AICS created for the 3000 community. QCTerm has always been "freely distributed to all users for their personal and corporate use, without time limit or any form of obligation being incurred by any party."
QCTerm is a full-function HP700/92 terminal emulator, very similar to other terminal emulators, running in Windows. The only difference is that QCTerm carries no cost "and may be freely distributed to as many users as you wish."
QCTerm was not constructed as a precise mimic of an HP700/92 terminal, although it identifies itself as such. "Rather, we wanted to make QCTerm simpler, more browser-like, and more intuitive, while retaining the full functionality that would be expected of an HP terminal," the software's description reports.