Len, - would John need a video card if he used his laptop? I was under the impression laptops have built-in video cards, if that is the case, couldn't it be utilised?
This is an interesting subject because I am long-sighted and had to have glasses made especially for reading music.
Here's a tip for your John - I have an HP Printer/Fax/Photo Copier which is capable of reducing or enlarging the print, so I copy the sheet music to A4 and for me it works very well, particularly as I keep all my music in A4 ring-binders anyway, so it is quite a good alternative.
I'll be watching this post - with great interest.
Audrey