I am interested in the "artificial device" described on page 330 here:
https://publib.boulder.ibm.com/epubs/pdf/dgt2u140.pdf (for use by iebcopy). I am actually interested in PDSes, not PDSE, but I would expect that an artificial device is the same either way, and that I could use it for a PDS too. It is defined as: 65536 cylinders 256 tracks (heads) and the tracks are 16M bytes, which means that regardless of the blocksize, you can fit 255 records in it. According to that page, it is subject to limits described here: https://www.ibm.com/docs/en/SSLTBW_3.1.0/pdf/idad400_v3r1.pdf But I'm not sure which page is relevant. I see limits on page number 41, but that's 16 MB for a single disk. This artificial machine can do that in a single track! What I'm interested in is why the number of heads is limited to 256. I normally see CCHHR - so that should mean 65536 heads, the same limit as the cylinders. Any idea why the heads on an artificial machine are only 256, and whether that is documented as suggested by page 330 of the first manual? Thanks. Paul. ---------------------------------------------------------------------- For IBM-MAIN subscribe / signoff / archive access instructions, send email to lists...@listserv.ua.edu with the message: INFO IBM-MAIN
