On 6/23/20 8:18 PM, John Forecast wrote: > Looks like a standard DOS/BATCH-11 tape file header. The first 6 bytes and > the last 2 bytes are the file name in rad50 - “HMMMD0P.SAV”. > Depending on where/when it was written the header can be either 12 or 14 > bytes: > > Format of DOS-11 magnetic tape header records: > > .rad50 /fn1fn2/ ;1st 6 letters of filename > .rad50 /ext/ ;3-letter extension > .byte proj,prog ;ppn (display it in octal) > .word prot ;protection code, usually <233> octal > .word date ;date: (year-1970.)*1000.+(day within year) > .rad50 /fn3/ ;[optional] letters 7::9 of filename > > Length=14. bytes (or 12. if no fn3, like in actual DOS/BATCH)
Thanks for straightening that out--all I know is that the tapes are from an 11/70, which isn't much information, admittedly. --Chuck
