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Forums > C64 Coding > VIC idle graphics / ghostbytes in sideborder

2018-12-19 20:26

spider-j

Registered: Oct 2004
Posts: 443

VIC idle graphics / ghostbytes in sideborder

Hey guys,

can anyone tell me what types of "idle graphics" / "ghostbytes" there are?
I know about VICBANK + $3FFF, but I vaguely remember there are more.
My situation:
Open Sideborder, sprites 4, 5, 6, 7 are on. Sprite 7 is at x position $170 and in the open sideborder one line before the actual sprite I have 3 "ghostbytes" visible at the same x coordinates. One (the second of them) seems to be $3FFF. At least if I set $3FFF to zero, the second one disappears. What about the other ones?

Cheers,
spider.

2018-12-19 22:14

Copyfault

Registered: Dec 2001
Posts: 466

Hi spider,

I sutmbled upon this a while ago which led to the discussion Sprite data fetch in sideborder.

I think this will explain the sprite data sources;) If not, feel free to ask again and point me to the open questions!

Cheers

Copyfault

2018-12-19 22:14

tlr

Registered: Sep 2003
Posts: 1702

Those other bytes are from the internal VIC-II bus. Basically it's whatever is written to or read from the VIC-II registers in that cycle. It defaults to FF due to the NMOS pull ups on the bus.

Previously discussed here: Sprite data fetch in sideborder

2018-12-19 22:29

spider-j

Registered: Oct 2004
Posts: 443

Thank you, guys! I knew I've read something about that somewhere before - was just too stupid / lazy to find it ;-)

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