18 Mar
2005
18 Mar
'05
6:21 p.m.
On Fri, 18 Mar 2005, Eric Smith wrote:
Tony wrote:
You can cheat with P7 and other double layer phosphors by using a blue filter
as they have a medium or short persistance blue phosphor and a very long
persistance yellow or orange phosphor.
Peter Wallace
I can tell you that although the MDA card has a
light pen connector, the
light pen certainly doesn't work on the 5151 monitor (far too long a
persistance).
Long persistence phospor doesn't preclude the use of a light pen, it
just introduces some limitations on the usage model. The DEC Type 30
and 340 displays as used on the PDP-1 through PDP-10 use a P7 phosphor
which has very high persistence, yet light pens were commonly used with
them.
Eric