I thought that had been done. I distinctly remember a graphics device emulation that implemented persistence, something I have since applied in another place (Cyber console emulation). I forgot the author?s name, but I thought it was for SIMH and specifically GT40 emulation. paul

On Fri, Apr 10, 2015 at 2:43 AM, Jim Stephens <jws at jwsss.com> wrote: If there are multiple buyers willing to pay that much for a GT40, I'd be tempted to sell, except that I was given the GT40 by a friend, so selling it would be inappropriate. Back in 2009, when CHM still had "Visible Storage"[*] and their "Timeline of Computer History" was just in the planning stages, I was asked whether I'd be willing to donate or lend the GT40 for an exhibit. I was definitely willing and even eager to do so. However, their plans changed, and it didn't happen. They don't have room to exhibit every interesting machine they might want to, and they've done a pretty good job of showing representative samples of many technologies. The last time I powered up the GT40 it had developed a fault which caused intermittent errors in the vertical positioning of points and line endpoints. I'm nearly certain that it was a fault in the digital electronics, prior to the vertical ADC, but did not have time to diagnose and repair it. Eric * Visible Storage was so-called because it wasn't considered to be true museum-grade exhibits. I have had no training in museum studies, so to my amateur eye the only thing it lacked was the glossy production values, which make things more presentable to the general public but are of no consequence to enthusiasts. Of course, the museum depends a lot on having appeal to the general public; aside from some generous wealthy benefactors, enthusiasts alone don't provide enough funding for such a museum.

The seller is Erik Brent. -Rik