I don't disagree on any point. Sorry for the way that post sounded.
On Fri, Aug 11, 2017 at 7:13 PM, Mike Stein <mhs.st...@gmail.com> wrote:
> Your use of "backwards" and "*everything *else" is mainly relative to
> IBM-PC compatible systems; some people don't realize that there were other
> computers before (and even after) IBM PCs and Apples.
> As I said, with a few notable exceptions the usual rear panel connector
> for serial (DTE or DCE), parallel and some SCSI ports was a female
> DB25F; serial printers of the day also used a female DB25F connector.
> In this context the Model T is essentially an intelligent terminal (DTE);
> have a look at the back panel of pretty well any terminal of the day
> (except DEC) or even a UNIX or CP/M computer and you'll probably find
> female DB25Fs.
> The IBM PC with its unusual (for the time) male DB25M was just becoming
> mainstream at the time of the M100; as its popularity grew the various ways
> that it deviated from the conventions of the day became the new "standard"
> and the market for gender changers grew substantially..
> The point is that when dealing with vintage equipment like the Model T or
> even an external modem do not assume that a female DB25 is a parallel port
> as IBM have (re)defined it.
> ----- Original Message -----
> *From:* Brian White <bw.al...@gmail.com>
> *To:* m...@bitchin100.com
> *Sent:* Friday, August 11, 2017 6:13 PM
> *Subject:* Re: [M100] M100 Digest, Vol 80, Issue 9
> It's wired as DTE, but with a female connector. *That's* what makes it
> backwards, not merely the female connector by itself.
> If it were a female connector, and wired as DCE, that would be unusual for
> a computer, but it would still be conforming to the same conventions as
> everything else.
> When you buy a random serial cable with male pins in a 25 pin connector,
> if you know nothing about the insides of the cable or where it came from or
> what the original packaging said etc, 99 44/100ths of the time that
> combination expects to be plugged into a modem, or other DCE device. The
> M100 isn't a modem, but if it's connector were wired DCE, that "modem"
> cable would still work.
> *today* such a plug would have an extra dimension of wrongness because it
> would be ambiguous with a printer port, but at that time, D25F might not
> yet have become a standard for parallel printer ports. It doesn't matter
> that the printer port on the M100 itself isn't confusable with it's own
> serial port, it's still a factor as long as a significant number of
> printers and their cables out there can physically plug in to the wrong
> port. At the time, that might not have been true like it absolutely is