prowler (12:50:06)
https://www.truthorfiction.com

Agemixer (11:32:38)
https://youtube.com ..OMG!

Agemixer (11:06:01)
but probably the smallest size for the code: if the read scanline is other than previous+1, then we are just sync

Agemixer (11:03:55)
the slowest way is to check for chance of scanline using 62 or 64 cycle counts while the actual rasterline lenghtvis 63cy. (PAL machine)

Agemixer (11:01:33)
yet 4th way to sync chips is about halving the jitter, reading every scanline changes (slow method but not slowest)

Agemixer (10:58:39)
(badline DMA or sprite DMA, CpU has to stop executing for others chips accessing the bus)

Agemixer (10:56:33)

Agemixer (10:56:27)
Quite a trickery to synchronize CPU and graphics chip - there is also a DMA cycles choice of syncing in using the CPU execution cycles during DMA starts with 3 emptive cycles to get the CPU finish the command first

Agemixer (10:51:38)
so when an interrupt occurred, and reading whether 3rd scanline is reached at exact timing, then reducing one cycle

Agemixer (10:48:27)
they actually did it stable by interrupting at one scanline (raster int), then preparing int for the next scanline, and give NOPs that reduces the jitter to max 2 cycles instead of random 1..8,

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Papa Smurf (Kari Kuusela)

arneex

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