"Actually, the bit is used by VSE. But it's use was never recorded in any OS mapping of the Format-1 DSCB."
The DOS footprint bit? It _was_ mapped at one time. DS4DIRF or something like that. DOS could happily use an OS/360 volume but didn't maintain the Formet 3s. We used to switch 2311 volumes between OS and DOS systems - if OS found the DIRF bit (also called the "Dirty Bit") on it would recalculate the F3s before starting allocation. It was a useful feature,and we used to ZAP the bit on every now and then as part of housekeeping. In faact I think even OS used to set it on before allocation and clear it afterwards. -- Phil Payne http://www.isham-research.co.uk +44 7833 654 800 ---------------------------------------------------------------------- For IBM-MAIN subscribe / signoff / archive access instructions, send email to [EMAIL PROTECTED] with the message: GET IBM-MAIN INFO Search the archives at http://bama.ua.edu/archives/ibm-main.html
