[GreenKeys] 120vdc connectors - opinions?

[Bruce Gentry]

Do eight level machines print a zero with a slash?   During my war, 
especially in theater,  we would deliberately not slash zeros on time 
tickets and scheduled exam cards, the computer systems of the time would 
freak out. Eventually, the software was changed to prevent that from 
completely stopping the programs.  AFCS, Alcohol First, Communications 
Second!   US Air Force  1969-73

      Bruce Gentry, KA2IVY


On 6/26/18 7:58 PM, Jordan Spencer Cunningham wrote:
> Also a computer person here, and I've never seen a slashed O 
> representing Oh, only ever slashed zeroes or plain zeroes representing 
> zero, even on all the older computers I've worked with where standards 
> were more inconsistent.
>
> That being said, I have read that some mainframe manufacturers 
> including IBM did utilize the slashed O to represent Oh but later 
> flipped it to represent zero when they came to their senses. You can 
> see an example of this in some of the commands listed in this old 
> BASIC manual: 
> http://www.mirrorservice.org/sites/www.bitsavers.org/pdf/dartmouth/BASIC_Oct64.pdf 
> (e.g. F�R X = 1 T� 100). The funny thing is that these mainframes were 
> most likely all using some kind of teleprinter as a terminal; I am not 
> aware of a printer that used slashed O for Oh, but then I'm not so 
> familiar with the later machines from the 60s/70s. IBM did manufacture 
> some teleprinters or teleprinter-like machines, though, so they could 
> have easily selected their own typeface that way.
>
> Backslashes are often a bit of a pain, though they have their purpose 
> if you're escaping a special character in code or scripts (I've used 
> more than my fair share of backslashes in sed commands). I suppose I 
> can think of debatably better methodologies for escaping or avoiding 
> having to escape in the first place by better language/interpreter 
> design, but backslash escaping is too entrenched now and will probably 
> haunt us for another century. Windows, of course, has completely 
> abused the backslash by utilizing it as a delimiter in path structures 
> when the rest of the sane world uses forward slashes as God intended.
>
> --Jordan
>
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