[cctalk] Re: IBM VM "CMS" tape format

Might be IBM CMS Conversational Monitor System (CMS, originally Cambridge Monitor System). Used it in 1977. Don’t know about the format though. Sent from my iPhone On Sep 20, 2023, at 17:24, Chuck Guzis via cctalk <cctalk(a)classiccmp.org> wrote: Group, Ive got a tape here from what I believe to be a VM system. The structure is unknown to me, although I can possibly take a stab at it. Lots of data between tapemarks that seems to consist of a number of records that start out something like this (translated from EBCIDC): 00000000 02 43 4d 53 46 30 30 30 31 31 32 30 35 31 31 32 |.CMSF00011205112| 00000010 34 37 30 37 36 30 31 32 32 32 31 31 30 31 31 31 |4707601222110111| Another example: 00000000 02 43 4d 53 46 44 41 54 41 20 5f 4e 55 4c 4c 5f |.CMSFDATA _NULL_| 00000010 3b 20 20 20 20 20 20 20 20 20 20 20 20 20 20 20 |; | 00000020 20 20 20 20 20 20 20 20 20 20 20 20 20 20 20 20 | | The data itself appears to be a bunch of 80 character card images. I found a mention on the old yahoo groups H390-VM discussions, but no clarity was ever shed on the subject. Does anyone know about this tape format? --Chuck