no serial access for cdos program in Warp4

I am trying to get my cdos program that I use under warp 3 to work under warp 4. I use it to download code through the serial port to an eprom programmer. When run under warp 4 I get the error message "error in cdos open queue function --key dl disabled". If I reload warp 3 on the same machine, it works just fine. Any suggestions?
sandrewsAsked:
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StonewalCommented:
Try Ray Gwinn's SIO serial drivers, they seem to work
wonders over IBM's default ones
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