In a message dated 6/11/2008 7:27:53 P.M. Central Daylight Time, [EMAIL PROTECTED] writes: >I wish there was a documented interface to STARTIO; I'd like to play around with Format-1 CCW's. :-) In AUG 1987 there were two sessions by two different presenters (I was one of them) at SHARE in Chicago on how to use STARTIO. In my session, I distributed a simple, sample program that used STARTIO to read the volume label from a DASD volume. If you can find this session in the SHARE archives, that handout is in the proceedings. IBM has not chosen to make STARTIO an externally documented interface. The main danger in using STARTIO is when you build a channel program with real addresses that has read CCWs in it, as you can easily overlay storage that is not yours. Write CCWs will not overlay storage, but you will write the wrong data out to the I/O device if you get those real addresses wrong. As with any other authorized service, STARTIO must be used cautiously. Or, as Ed Jaffe suggested, you can use Format 1 CCWs with EXCP in unauthorized code. If your code is authorized, there is a lot more you can do by modifying DEB fields after you OPEN your DCB. Bill Fairchild Rocket Software
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