Light Pens ...

From: Pete Turnbull <pete_at_dunnington.u-net.com>
Date: Tue Jul 17 18:36:40 2001

On Jul 17, 16:54, Richard Erlacher wrote:

> Viewed from the 6845, is the block 1 scan line high?

Yes.

> Getting the horizontal location right, as you'd have to in order to do
precise
> drawing, might be a bit more complicated, don't you think? an 8-pixel
extent of
> uncertainty is quite a bit on a 640-pixel display.

But it's usually less than 8 bits. For example, the pen I built (which had
assorted other problems as per my other responses) was mostly used on a
4-bit-per-pixel display (16 colours) or a 2bpp (4 colour) display, so the
resolution was usually 2 pixels or, at worst, 4.

-- 
Pete						Peter Turnbull
						Network Manager
						University of York
Received on Tue Jul 17 2001 - 18:36:40 BST

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