Re: A Few Apple II questions...

[dempson@actrix.gen.nz (David Empson)]

Labelas Enoreth <labelas@hotmail.com> wrote:

> In article <1dw6igd.6ct6ab1oxyvtiN@dempson.actrix.gen.nz>,
> dempson@actrix.gen.nz (David Empson) wrote:
> 
> > [pedantic mode on] It isn't a DB-15, it is a DA-15. [snip] [end pedantry]
>
> Yeah, I knew about the different sizing but I never can remember which
> letter goes where. But then, that was someone else saying that. How
> exactly does the size coordinate with the letter?

Here is an extract from an earlier article posted here by
david@uow.edu.au (David Wilson).  The original message ID was
<david.912561195@wraith>.  I've added one comment about the DA-15, in
square brackets.

<begin extract>

The D is the shape of the plug, the letter tells you the size and the
number the pin count. Here are the standard ones:

DE-9    (AT serial port, Apple //e joystick)
DA-15   (IBM PC joystick [also Mac/IIgs/IIc video connector])
DB-25   (standard serial port)
DC-37   (IBM-PC external floppy)
DD-50   (some really old SCSI devices from Sun etc)

And these are the high density ones:

DE-15   (VGA monitor)
DA-26
DB-44
DC-62

Other than the DB-25, the DD-50 is about the only one people get right.
All the rest get lumped together as DB-xx.

<end extract>

There doesn't seem to be any logic to the ordering of the connector
sizes.  I suspect the DE-9 was a late addition, with the original sizes
being 15, 25, 37 and 50.

Note that there is no official letter suffix (that I'm aware of, anyway)
for the 19-pin connector used for the drive connector on the Apple II.

-- 
David Empson
dempson@actrix.gen.nz
Snail mail: P.O. Box 27-103, Wellington, New Zealand