[Coco] [Spam] hardware scrolling

[Simon Jonassen]

Hey Nick...

Here are some more vids to prove the screen can be scrolled
independantly....

https://www.youtube.com/channel/UCscBsB4XgvFUFtI25vXigqQ/videos

Theres also some overscan vids and some hardware zooming....

All on a coco II

/Simon :-)
 

-----Oprindelig meddelelse-----
Fra: coco-bounces at maltedmedia.com [mailto:coco-bounces at maltedmedia.com] På
vegne af Nick Marentes
Sendt: 26. oktober 2013 07:53
Til: CoCoList
Emne: [Spam] [Coco] hardware scrolling

This is not a new feature. It's been known. I just don't think that anyone
used it.

Does anyone know of a CoCo 1/2 game that actually used the ability to set
start of video for vertical or horizontal scrolling? I think everyone just
used software which allowed for 1 byte movement. As it stands, it jumps in
increments of several bytes (6?).

Also, same problem as the CoCo3 GIME... it moves the whole screen.

Simon, your next challenge is split screen scrolling which I think the VDG
would be able to do by syncing on the horizontal scanlines and changing the
$FF22 at set points.

Nick

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