CompuServe Messages

Fridli, Thanks for your attempt to duplicate my observations. I am using the same versions of MTMCDE.SYS and MSCDEX.EXE. When looking at your CONFIG.SYS entries, I noticed you have the line: DEVICE=c:\qemm\loadhi.sys c:\cdrom\MTMCDE.SYS /D:MSCD001 /P:300 /A:0 /M:30 /X You don't set the /T parameter which is used to select the DMA channel. I tried this setting and the result is DMA is not used and it defaults to Software Interrupt Transfer (the same as setting the /T option to /T:S). The corresponding line in my CONFIG.SYS file is: DEVICE=C:\QEMM\LOADHI.SYS /R:1 C:\DEV\MTMCDE.SYS /D:MSCD001 /P:300 /A:0 /M:40 /T:6 /I:10 /X I agree that without using the DMA channel, windowed DOS applications seem to work fine. I would like to get DMA transfer working because things should run faster and smoother in multimedia applications. Thanks again for your help. Ken