Lemmings supported for almost 10 years: http://www.dosbox.com/comp_list.php?letter=L&showID=382. Dosbox doesn't disconnect your display, that's a Vista issue and possibly SDL. Details help, too, such as laptop or desktop, and so forth. If you have details, perhaps someone could help diagnose your Vista issue.

This "Dell Studio 1555" laptop runs "Windows Vista 32-Bit Home Premium Service Pack 1" with an "Mobile Intel 4 Series Express Chipset Family" graphics device. There's a display configurator that has a "multiple displays" section, but no knobs to turn there (only "operating mode: single display" and "primary display: integrated display"). I don't feel like playing with source and building .exe files, so I guess I give up. Also, with LemmingsCorrected.zip, the problem persists.

Contact Dell support to find out whether the video driver and system bios may be updated: https://downloadcenter.intel.com/SearchResult … eng&ProdId=2991.

I see. The owner doesn't think that her laptop is broken, and she was already alarmed by me typing stuff at the dos command line and editing the dosbox config file ("You're programming something! No, I can see that is programming! Don't you break my computer!"). So no driver updates here. Thanks for caring. 😀

Perhaps disable the external monitor via the bios, if the option is available. There is also some SDL code to handle extra monitors, just in case that the video driver is reporting to SDL that there are multiple monitors. This is a guess, however, and would require testing.

Another option is to plug in a 2nd monitor, given there is a port for it, and see if it helps. (Also, try setting dosbox/sdl to "windib" instead of "directx").

Ouch! The BIOS setup hinted me in on the fact that I didn't press F1 to start the level. I pressed the "change displays multimedia key", because here you don't just press F1 to get F1, but you must use the blue Fn modifier. If you're laughing as hard as I am, your time wasn't wasted... 😀

😀

Anyway, once I had a programmable Hewlett-Packard RPN calculator where you could edit both the key mappings and the screen font. I interchanged the "7" and "8" keys in the key map, and then I interchanged the "7" and "8" glyphs in the font. Then I saw with glee how I had turned a calculator into a not-so-obvious mis-calculator. Muahaha.