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From: R Daneel Olivaw <Danny@hyperspace.vogon.gov>
Newsgroups: comp.lang.fortran
Subject: Re: Feed control
Date: Thu, 4 Apr 2024 19:09:40 +0200
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Gary Scott wrote:
> On 4/4/2024 8:52 AM, Dr. What wrote:
>> -=> Gary Scott wrote to All <=-
>>
>>   GS> On 4/3/2024 7:43 AM, db wrote:
>>   > When I learned Fortran many years ago, the first
>>   > character in a line to be printed (or later,
>>   > displayed) controlled line or page feed. A blank
>>   > produced a new line, a "1" a new page. We used these
>>   > to control what happened.
>>   >
>>   > These days, this doesn't seem to be the case, so
>>   > in a sense, Fortran is no longer backward
>>   > compatible in this one sense. Or is it?
>>   >
>>
>>   GS> This was always, and remains device dependent.
>>
>> That's not completely true.
>>
>> Using MS-FORTRAN on my vintage computers, I always have to start my
>> FORMATs
>> with "1X".  If I fail to do that, the output, even to the screen, chops
>> off
>> that first character.
> 
> Hmmm.  I'd say that's precisely what "device dependent" means.  Although 
> some behavior in MS Fortran was just bugs.
>>
>>
>> ... Epitaph on a gravestone: Cheerio, see you soon.
>> ___ MultiMail/Linux v0.52
>>
> 

Not at all, the 1X means that the line-feed character is a space.  A "+" 
there would probably overlay whatever had previously been printed to 
that line with something new.
I have used several different compilers on several different 
architectures over the years (the newest adhered to the F77 standard) 
and the meaning of the first character on a line was common to all of them.