First post, by ux-3
- Rank
- Oldbie
I experience a short video freeze (~o.3s) in a game intro, if I use ESS ISA sound cards. It always happens at the same location, with various ESS ISA cards and chips. Other manufacturers like yamaha or creative don't cause the video stutter. System is a 486-40, graphics card is a Tseng ET 4000 ISA. Changing video to VLB S3 card will keep stutter.
This stutter disappears if video bios shadow is disabled.
The stutter also disappears if BUFFERS is increased to exactly the point (Buffers=47 here) where they no longer reside in high memory but are instead located in the low part. From this I suspected a conflict in high mem and turned off shadowing, see above.
The stutter also disappears if I raise the ISA bus speed to about 13.3 MHz.
Edit2: The stutter also disappears if smartdrive is loaded, even if C is not chached!+
Edit: If I turn video bios shadow off and use emm386.exe rom=C000-C7FF, I get the stutter too.
All three solutions come at price I am not really willing to pay. I would really like to understand, what is going on here.
Any help would be welcome.
Retro PC warning: The things you own end up owning you.