dab@jhereg.Minnetech.MN.ORG (David A. Bright) (07/22/89)
I have been trying to write a device driver for a tape drive under System V/AT, but can't seem to get DMA to work. When I initiate data transfer, it doesn't seem to work (I get an error indication from the tape drive); sometimes the residual count is non-zero, sometimes it isn't. I don't know exactly what is the problem (from the drive's perspective), because to get extended status, I need to do DMA (Catch-22!). The documentation from Microport on writing device drivers is, to say the least, sketchy. Any help would be greatly appreciated. -- David A. Bright 910 W. Burke Avenue dab@Bright.MN.ORG (Home) Roseville, MN 55113 612 487-2407 (Voice) 612 487-2416 (Data) -- David A. Bright 910 W. Burke Avenue dab@Bright.MN.ORG (Home) Roseville, MN 55113 612 487-2407 (Voice) 612 487-2416 (Data)