-----Original Message----- From: IBM Mainframe Discussion List [mailto:[email protected]] On Behalf Of Dale R. Smith Sent: Tuesday, August 07, 2012 11:16 AM To: [email protected] Subject: Re: Using NOTE and POINT simulation macros on CMS? >The TTR for POINT to use was calculated based on user input. We used to share >a CA-TMS TMC between VM and MVS. VM:Tape had read/write access and users had >read only access to the TMC file. We had a VM/CMS program that could read the >TMC >volume/dataset records and display the information using XMENU. The TMC >contained control records at the beginning of the file with block offsets for >the volser ranges that were defined. The LRECL and BLKSIZE of the TMC were >used to calculate the >number of blocks per track based on the device type, >(was 3380, then later 3390). The user entered the volser of the tape they >wanted to display and the TTR of the block/record was calculated, (based on >the above info), and supplied to POINT, then a >READ was issued to get the >correct block/record.
So presumably when the control records were created, CA software did a NOTE of the TTR of the beginning of each volser range and saved the results of the NOTE in the control record. This saved NOTE value was the base to which the offset, calculated from the user's input, was added. Bill Fairchild Programmer Rocket Software 408 Chamberlain Park Lane • Franklin, TN 37069-2526 • USA t: +1.617.614.4503 • e: [email protected] • w: www.rocketsoftware.com ---------------------------------------------------------------------- For IBM-MAIN subscribe / signoff / archive access instructions, send email to [email protected] with the message: INFO IBM-MAIN
