Hi Eric, > in case you used an USB mouse with BIOS PS/2 over USB > support: Try a PS/2 mouse or a DOS USB driver instead of > "BIOS legacy".
My mouse is not USB. It is a real old one, with a flat plug with two rows of holes. > > 4. Holding down keyboard keys while screen refreshes, as > > suggested by Larry (doc...@yahoo.com): shift, ctrl and > > alt keys cut screen refreshing time by half. > > Right-hand alt key is even slightly better. > Why does that make a difference? I have no idea why it makes a difference. I can only say that, for the drawing used for tests, the screen normally refreshes in about 10 sec, but will refresh in 5 sec if either shift, ctrl or alt is held down. > Did you try FDAPM ADV:REG instead of FDAPM APMDOS? I can try it, but as far as screen refreshing speed is concerned, option APMbios seems good enough: it is as fast as if FDAPM was not loaded. > > Methods 4 and 5 are cumulative, i.e., refresh time is > > reduced to one-quarter of the original time if both are > > used. This is a substantial improvement, but still a long > > way away from the speed of MS-DOS. > How big is the difference? Does the MS kernel matter, the > MS mouse driver or both? These are the differences observed under FreeDOS: -- Method 5 (avoiding option APMDOS for FDAPM) by itself reduces screen refreshing time from 10 to 5 sec. -- Method 4 (holding down keys) by itself also reduces it from 10 to 5 sec. -- Methods 4 and 5 in combination reduce it from 10 to 2.5 sec, i.e., both have their effect. The mouse driver does not seem to matter: speed is the same with either CuteMouse or Logitech driver. Please explain what "MS kernel" is. Is it a file in Microsoft DOS, like the one in FreeDOS? Anyway, tests with MS-DOS were done with version 6.22, installed from original floppies. Here is a summary of the whole thing: - Under FreeDOS, refresh speed is increased by avoiding FDAPM with option APMDOS. It can be further increased in two ways: by holding down keys or, much better, by moving the mouse. - Under MS-DOS, refresh speed is much faster than any of the above. Regards, Marcos ------------------------------------------------------------------------------ This SF.Net email is sponsored by the Verizon Developer Community Take advantage of Verizon's best-in-class app development support A streamlined, 14 day to market process makes app distribution fast and easy Join now and get one step closer to millions of Verizon customers http://p.sf.net/sfu/verizon-dev2dev _______________________________________________ Freedos-user mailing list Freedosfirstname.lastname@example.org https://lists.sourceforge.net/lists/listinfo/freedos-user