The "this week" to be released DOSBox Staging 0.81.1 maintenance release will also include the option to emulate video memory access delays.
We’ve added the new vmem_delay setting to the [dosbox] section to more closely emulate the behaviour of old video cards. This approximates the CPU-throttling effect of accessing slow video memory via the ISA bus. The feature was adapted from DOSBox-X based on a tip by MX9000. Thanks man! 😎
To enable the feature, just set vmem_delay to on in your config. This can help reduce or eliminate flicker in Hercules, CGA, EGA, and early VGA games and “even out” emulation speed in speed-sensitive titles.
vmem_delay = on fixes the flashing graphics and various speed issues in at least the following titles:
Corncob 3-D
Corncob Deluxe
Crazy Brix (vmem_delay = 2000 and cycles = 70000 makes the game run smoothly)
Future Wars (also needs cycles = 1000)
Gold of the Aztecs, The
Hostages (also needs cycles = 1500)
Operation Stealth (when VGA or EGA is selected in the game’s setup)
Quest for Glory II (fixes the too-fast vertical scrolling in the intro)
