On a sunny day (Mon, 17 Feb 2020 08:21:14 -0600) it happened Richard Owlett
 wrote in
:

>The references I was given did not make it make simple to select
>mutually compatible components -- the required information being
>scattered among multiple tables or URLs.
>
>I propose to create a single spreadsheet {likely distributed in the TAB
>delimited variation of a CSV file}.
>
>I have two specific questions:
>   1. Has this been done before?
>   2. Is there an already existing site that would accept it?
>      {Their submission requirement could affect my layout.}
>      {I'm still working on column headings that would balance
>       coverage and simplicity ;}
>
Just for the record
what you say makes no sense whatsoever for me
Your OP was to connect a touch display to a raspi

This has been done

There  are a zillion types of displays and all can  [by the cunning]  be
interfaced to a raspi.
To do that you need to
1) know electronics design (interface [logic]levels, interface types, interface
speed,
  both for GPIO and the display unit.
2) know programming in a close to hardware language to write the driver, and
the user program,
  interface protocols i2c, SPI, maybe USB and HDMI.

When /if you use the search engines and ask for a display for raspberry there
are plenty around

or use ebay:
 
https://www.ebay.com/sch/i.html?_from=R40&_trksid=m570.l1313&_nkw=rspberry+pi+t
ouch+LCD+&_sacat=0

take the first hit:
 https://www.ebay.com/itm/381182253906

Seems there is a free driver for it (come to think of it I do have a display
like that somewhere I think ;-) )
I do not like small displays end even less 'touch screens', good keyboard and
typing speed
is essential for programming or even writing these texts.

And that programming you WILL have to do sooner or later...

I will leave it at his.

You say EE 1960, well then it was much the same... I did my exams in those
years, no puters yet,
Electronics is a never stopping learning thing  /experience.. I never stopped,
Somebody starting from scratch these days would make me wonder :-) :-)
There is a newsgroup sci.electroncs.design if you are into hardware design,
maybe there is still activity there.

And then what should the PDA do?
Are you gonna write that or write your own?
Usually all I need is 'wcalc' and 'units' and a few more Unix utilities,
there is also a windows emulator and LTspice for electronics simulation that
runs on that (never use it much myself).
How far does 'PDA' reach? Do you have an oscilloscope? test equipment? All that
here and without that
I would not venture into raspi interfacing unless it was a ready to plug in
solution display.
...
intergalactic connection broken earthling lost

--- SoupGate-Win32 v1.05