williams@umaxc.weeg.uiowa.edu (Kent Williams) (11/29/90)
I am addicted to using PRo-Yam. Under windows 2.x it ran fine in the
background doing file transfers. Now when I run it under 3.0
in enhanced mode, it drops characters during transfers if I do
anything else. I assume this stems from windows virtualizing the
async port. The question is, how would you go about fixing it?
And another thing -- when windows scrolls a dos session, why does it
redraw the whole window from the top, rather than bitblt the top+1 to
bottom lines up to the top and then write the bottom line? Or is that
what it does?
--
Kent Williams --- williams@umaxc.weeg.uiowa.edu
"'Is this heaven?' --- 'No, this is Iowa'" - from the movie "Field of Dreams"
"This isn't heaven, ... this is Cleveland" - Harry Allard, in "The Stupids Die"spolsky-joel@cs.yale.edu (Joel Spolsky) (11/29/90)
In article <3335@ns-mx.uiowa.edu> williams@umaxc.weeg.uiowa.edu (Kent Williams) writes: >And another thing -- when windows scrolls a dos session, why does it >redraw the whole window from the top, rather than bitblt the top+1 to >bottom lines up to the top and then write the bottom line? Or is that >what it does? Windows doesn't scroll the DOS session, the BIOS does, and it does it by basically "bitblt"ing a chunk of text mode video memory. (Well, it does a REP MOV, the bytewise equivalent). Windows takes snapshots of the text mode video memory, converts them to graphics, and displays them. It does this a certain number of times per second. If it does this while BIOS is in the middle of a scroll operation you get the effect of doubled lines (which you can get in straight DOS by hitting Pause at the right moment during a scroll). Joel Spolsky spolsky@cs.yale.edu Silence = Death