John, I did something similar but on VSE reading and writing to tape drives
Scott ford www.identityforge.com from my IPAD 'Infinite wisdom through infinite means' > On Dec 9, 2013, at 3:35 PM, John McKown <[email protected]> wrote: > > The only EXCP that I every wrote as at my first job. It read cards from an > actual card reader and would do a "select output tray" (sorry don't > remember actual terminology) based on whether the card in question passed > initial validation testing. So that the "bad cards" could be gathered up > and sent back to the department that gave them to us. > > > On Mon, Dec 9, 2013 at 2:28 PM, Gerhard Postpischil <[email protected]>wrote: > >> On 12/9/2013 2:56 PM, Skip Robinson wrote: >> >>> Not sure what's meant by having to chain CCWs. I just finished updating an >>> old RYO program that writes 80 byte records to any device specified >>> because I needed to test >32K blocks on tape. I merely added a DCBE with >>> BLKSIZE=0 and pointed to it in the existing DCB. No other changes. Created >>> a tape file with BLKSIZE=261760 (256K) (as reported by RMM) by specifying >>> that block size in JCL. No attempt at chaining, which I would not know how >>> to do anyway. >> >> 1) The access method does the chaining for you. If you make the device not >> ready while its reading or writing, and take a dump, you will find both the >> xSAM CCWs and the converted CCW(s) and the IDAL. >> >> 2) That's a shame. Every programmer can benefit from familiarity with the >> hardware - write a test program using EXCP to read a multi-volume tape, or >> use XDAP to read a multi-volume DASD data set with unknown block sizes. >> >> Gerhard Postpischil >> Bradford, Vermont >> >> ---------------------------------------------------------------------- >> For IBM-MAIN subscribe / signoff / archive access instructions, >> send email to [email protected] with the message: INFO IBM-MAIN > > > > -- > This is clearly another case of too many mad scientists, and not enough > hunchbacks. > > Maranatha! <>< > John McKown > > ---------------------------------------------------------------------- > For IBM-MAIN subscribe / signoff / archive access instructions, > send email to [email protected] with the message: INFO IBM-MAIN ---------------------------------------------------------------------- For IBM-MAIN subscribe / signoff / archive access instructions, send email to [email protected] with the message: INFO IBM-MAIN
