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"... | DOS 6.22 |<--->| Zip |<--->| KXL-D720 | Suggestions?..." ~~~~~ have you tried reversing the order of scsi devices? i seem to recall having better luck with aspi devices (like cd roms) when they were the first device away from the card. "... Also, intermittently, on leaving Windows or soon after that, the system hangs and says that EMM386 has detected an error #6. ..." ~~~~~ if you were using a xircom card, i could help you. otherwise, i'm at a loss. "... suggests that SMARTDRV /double_buffer should be included in CONFIG.SYS when SCSI devices are used. Does anyone have any idea why? And should this be included before or after EMM386 gets loaded? (I have tried both and noticed no difference, but as my system is acting up every now and then, I can't be conclusive about this.) ..." ~~~~~ i always thought that was only for scsi *hard disks.* in any case, dos can help you with this one. boot up with double buffering loading in your config.sys. then at the dos prompt, type 'smartdrv' and you will see a list of your drives and cache information for each. the last column is 'buffering.' if any of the items in the list have a 'yes' under 'buffering' then, according to dos, you should have it loaded. if so, it needs to come *after* the memory manager, because smartdrv uses extended memory, not conventional. if every drive shows a 'no' in the buffering column, then you should load smartdrv in your autoexec instead. also, if this is the case, you can get some speed enhancement by writing it this way: c:\windows\smartdrv.exe 512 512 or c:\windows\smartdrv.exe 1024 1024 at 20mb, you have enough ram that you can afford 1024k each (dos cache, win cache). if you don't specify these cache sizes, it will default to 256k each and you won't nearly as much benefit from it. hope this helps. Michael J. Verne Systems Administrator, Ventana Communications Group michael_verne@vmedia.com http://www.vmedia.com/michaelv/ . . . . . . . . . . . . . . . First say to yourself what you would be, then do what you have to do. -Epictetus