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2008-08-24 23:20

chatGPZ

Registered: Dec 2001
Posts: 11386

upper/lower border details

for fpga64 testing/checking/verifying we are looking for some info...

- opening lower/bottom border, can it be done by using y-scroll only (not switching 25/24 line mode) ? if yes, can you point at a demo that uses that trick?
- whats the absolutely last point where you have to do the 25/24 lines toggle to open the border? does it depend on y-scroll?
- please point at a demo that uses the "opposite" of opening the borders, ie "close" them to get rid of badlines and then does sprite stuff... i know there are lots but, oh well. just tell :)

yeahyeahyeah. i could probably write testcode and find it out but god, i am lazy. and someone around here probably knows it offhand anyway =) (if you think there is some more interisting stuff related to upper/lower borders, please tell aswell. except the "half open" borders from krestage1, we covered that already =P)

... 10 posts hidden. Click here to view all posts....

2008-08-26 11:06

Ninja

Registered: Jan 2002
Posts: 411

algorithm: You can recover if you switch on $d011 bit 4 for a short time. But for most routines, this is a special case. Usually, you switch this bit off and keep it this way...

gpz: Darwin uses it in the Test-Bit-Digi-part. For a tiny testcase, try Borderless.

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