Hi Keith,
I've just checked: both computers are set at 1280 x 1024, which is the max. they'll go.
The Internet one also adds the information that it's at 75 Hz and 32-bit, the other one, the PS one, won't tell me its details beyond the 1280 x 1024 part and 32-bit.
I think they love me as I love them!
Thanks for your suggestions,
Rob C