16 Dec
2015
16 Dec
'15
3:03 p.m.
-----Original Message-----
From: cctalk [mailto:cctalk-bounces at classiccmp.org] On Behalf Of Chuck
Guzis
Sent: 16 December 2015 22:14
To: jwsmail at jwsss.com; General Discussion: On-Topic and Off-Topic Posts
<cctalk at classiccmp.org>
Subject: Re: IBM CMS dumpfile idiocy
On 12/16/2015 01:19 PM, jwsmobile wrote:
this tape
If it's an 80 byte record, the PSW is further
into the block. the
first 80 positions from the Green card should be a clue.
No, the first record is 4101 bytes long. Interestingly, all blocks on are an odd number of bytes in length.
--Chuck
There is a 0x02 character, followed by "CMS" in EBCDIC then a record type
"V", "F" or "N" for the file status table.
From the "cmstape.c" I sent you the link
too....
/*
* Format of a CMS TAPE DUMP tape entry for each file:
*
* 1) One or more blocks like this:
* +--+-+-+-+-+-+-+-----/ /-+-+-+-----
* |02|C M S V| l | data... | l | data...
* +--+-+-+-+-+-+-+-----/ /-+-+-+-----
* <-----------4101 bytes max---------->
*
* or this (for fixed records (lrecl in the FST)):
* +--+-+-+-+-+-----/ /-+-+-+-----
* |02|C M S F| data... | l | data...
* +--+-+-+-+-+-----/ /-+-+-+-----
* <-----------4101 bytes max---------->
*
* 2) Followed by an ending FST + filename
* +--+-+-+-+-+------------+
* |02|C M S N| FST data |
* +--+-+-+-+-+------------+
* <-------87 bytes------>
Dave