[HECnet] Help to identify tap file format

14.03.2013 19:25, Johnny Billquist : On 2013-03-14 16:07, blmink wrote: Dear All, I found several pdp-11 tape image files on the net which have ".tap" suffix. It isn't well known simh/e11/tap/tpc tape images. Please help to identify which format they have. How such file can be converted to simh .tap or .tpc or how it can be used/mounted? Below is the beginning of hexdump of one of these files named "F77.TAP": [...] Where did you find them? They look totally broken. I can't see any reasonable format in them at all. The first 512 bytes might be some kind of meta-information, but it's really weird. Get some proper images instead, as from trailing-egde. Johnny There's file on trailing-egde: ftp://ftp.trailing-edge.com/pub/rsxdists/rsx11mplus_4_6_bl87_dsk.zip It contains rsx11mplus_4_6_bl87.dsk disk image. If you mount or boot this image, you can find in [200,200] directory: Directory DU0:[200,200] 14-MAR-2013 19:35 RT57MU.TAP;1 7040. 03-NOV-1999 21:53 F77.TAP;2 2440. 03-NOV-1999 19:53 DNMP46EN.TAP;1 41840. 03-NOV-1999 20:43