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Forums > CSDb Entries > Release id #200011 : Softwired
2021-02-18 21:03
Krill

Registered: Apr 2002
Posts: 3098
Release id #200011 : Softwired

Okay, so there were some unexpected raster glitches on Mibrishow.

Thing works just fine on my main realthing machine, ofc., and i did test oldcia vs newcia on x64sc (was too lazy to dig out even older realthings to test).

I'm on this mystery. =)
2021-03-14 15:13
Krill

Registered: Apr 2002
Posts: 3098
Mibri did a bit of investigation, and we're now sure it's all just an artefact of the capture/streaming pipeline.

The capture device seems to unconditionally convert C-64's non-interlaced 50 Hz video to interlaced, which would then be de-interlaced for streaming again, which can then produce visible glitches like in this example.

Pretty sure some similar threads exist already, but now the question is, what would be a good (and reasonably inexpensive) capture device for streaming C-64 content? =)
2021-03-15 19:44
MagerValp

Registered: Dec 2001
Posts: 1083
A RetroTink 2X and one of those new cheap HDMI capture sticks from eBay. Surprisingly good.
2021-08-15 21:10
mankeli

Registered: Oct 2010
Posts: 152
Does anyone know what this does to require x64sc?
2021-08-15 21:29
Krill

Registered: Apr 2002
Posts: 3098
Uses Quiss' ingenious extremely small stable-raster timer setup with Copyfault's refinements, exploiting different behaviour of an "illegal" instruction in the face of badline DMA:
                .cerror * != $08a3, "sync not at $08a3"
sync = * + 1
                ldx #$9e
                ldy #8
                cpx #0
                bne sync
See this insane thread: Shortest code for stable raster timer setup with TL;DR =)

(On x64, the loop just never terminates, as this special behaviour isn't emulated.)
2021-08-16 00:45
mankeli

Registered: Oct 2010
Posts: 152
Amazing! Thanks for the answer :D
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