invictius Posted October 31, 2016 I know an 8-bit one drops it down to 15fps, I've finally got a true '93 system, apart from not having a 16 bit isa card - I'm using a pci. Was it ever possible to run doom at full frames with a 16 bit isa? 0 Share this post Link to post
Linguica Posted October 31, 2016 invictius said:Was it ever possible to run doom at full frames with a 16 bit isa? Yes http://www.flaterco.com/kb/DOOM/VanillaDOOM.htmlSince DOOM uses only a standard VGA mode and is playable even with ISA VGA cards, 0 Share this post Link to post
Maes Posted October 31, 2016 The question has an interesting extension: an ISA videocard's bandwidth does put a limit on the maximum theoretical framerate when playing back demos with the -timedemo parameter. https://www.doomworld.com/vb/doom-general/73471-fastest-vanilla-doom-shareware-timedemo-youve-ever-seen/ If you observe the results in the famous Doom benchmark results page, you'll see that vanilla Doom, regardless of CPU power, seems to top off at 200-something fps, even if the CPUs used are up to a hunded times faster than what would be required to obtain 35 constant fps in vanilla doom. Any figure significantly higher than 200 fps was obtained with a source port and/or under a different OS/runtime environment (e.g. a VM). The theoretical max, for an pure ISA video card, with all timings accurate, would be about 260 fps. Using PCI or AGP video cards in DOS mode doesn't seem to be able to "break" this barrier, not even close. 0 Share this post Link to post