Posted by Genom on 1, 2000 at 5:32 PM:
In Reply to: PS/2 vs. serial mouse (i.e. Happ trackball encoder vs. KE-72) posted by Dave Dribin on 1, 2000 at 4:41 AM:
Actually, yes. PS/2 does indeed use mroe CPU cycles thana serial mouse. Serial port is usually locked at 9600 baud, thats a pretty measly data rate, however, the PS/2 port is already scanning at a faster rate than a serial port, giving you better resolution. If you move the sucker fast, than it takes up a bit more cpu tiem to process.
HOWEVER, it shouldnt be THAT noticeable. Might be the DrDOS driver?
: Hello gang,
: I did some experiments comparing PS/2 and serial mice, and I wanted to see if other people see the same behaviour.
: I'm running the DOS version of MAME under DR-DOS 7.03 with the DR-DOS mouse driver. I've noticed that a PS/2 mouse causes frame rates to drop when moved rapidly. I ran Centipede and I noticed the FPS drop from 60 to 50 or even 40 if I move the mouse around a bunch. Now, if I do the same with a serial mouse, I do not have this problem. Can anyone else confirm these results?
: Do PS/2 mice require more processing overhead? Is it just DOS? Is it the mouse driver?
: I'm trying to decide between the Happ trackball encoder and the KE-72. Given my results I'm going to spend the extra $$ for the Happ.
: -Dave