Activity

From 11/01/2017 to 11/30/2017

FO 09:37 PM Feature #3: High resolution antic support: Fixed gtia modes in 2x and 4x. Also fixed oddline flag (needed for svideo pal). foft

FO 10:15 PM Feature #3: High resolution antic support: Fixed the mode 8 stripes in 2x bug. Tricky to debug, one line fix!
Added gtia greyscale mode to the testbench. This isn't working properly in 2x and 4x - getting strange stripes. I guess the wrong clock is used in gtia somewhere. Will b... foft

FO 09:27 PM Feature #3: High resolution antic support: !manymodes.gif! foft
FO 09:24 PM Feature #3: High resolution antic support: Added a many modes at once screen (antic 8 through antic f for now) to debug in 1x,2x and 4x. I don't see the half colour clock shift in gr8, perhaps I was mistaken when looking on the TV. I am seeing some stripes in some low res modes i... foft

ST 12:28 AM Feature #3: High resolution antic support: Hoping to get back to being able to test out this new stuff real soon! I'm finally finishing up a major vehicle repair which has been keeping my tied up since mid April. I'll have it back on the road by end of day tomorrow.
Stephen

FO 09:38 PM Feature #3: High resolution antic support: gr.8 seems to be off by half a colour clock in 4x mode. Wonder if that is gtia or antic. Didn't notice that in gr.0 foft
FO 09:26 PM Feature #3: High resolution antic support: I think I have the antic alignment all working. Next up, gtia... foft

91 02:46 AM Feature #3: High resolution antic support: Keep up the good work, thank you for all the time you are putting into this! 917k

FO 09:15 PM Feature #3: High resolution antic support: Example output from sim. I display ctrl F and ctrl G at the start and end of a line - to check alignment. I switch colour clock multiplier after two mode 2 lines.
!colour_clock_offsets.png!
So some issues...
i) background colour s... foft

FO 09:43 PM Feature #3: High resolution antic support: I added rendering of the video output ot the test bench... Very helpful to debug visual video issues. foft

FO 09:57 PM Feature #3: High resolution antic support: Back to computing the dma clock start cycle, rather than applying hscrol high bits as a delay. With 2x and 4x support still though.
Next up, need to sort out the output timing to be aligned with the displayed area... Then onto some gti... foft

FO 10:10 PM Feature #3: High resolution antic support: Thinking about this I bet I just broke the hscrol change delay, since this will no longer allow late changes. One to think about... foft
FO 10:09 PM Feature #3: High resolution antic support: Fixed issue with sprites - I had changed hscrol to count at 4x original colour clock and forgot to adjust the dma address by 2 bits as well.
Made hscrol work as a colour clock delay, which should fix highres scrolling. foft

FO 10:15 PM Feature #3: High resolution antic support: Sped up the refresh cycles to 2x and 4x. No missing characters now mid-screen. However this will probably flicker on SDRAM, since its shorter than a real refresh cycle iirc.
Took a look at hscrol. Understand what needs doing but too t... foft

FO 09:53 PM Feature #3: High resolution antic support: Fixed a few more bugs and tried it again. Was starting to despair that it worked on sim but not the real hardware. Then I selected 2x CPU mode - and it worked! Of course I'm blocking most of the cycle to wait for PBI in 1x mode, doh. So ... foft

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