marqs85
Lumacode - C64 Line5x No Audio
Following the instructions on here to set my Ossc up to work with my C64 over Lumacode : https://theoasisbbs.com/theretrochannel-lumacode-on-the-ossc-hdmi-from-the-c64-and-c128/ I don't get any audio being passed to the TV, or speakers.
I've seen a couple of other people report the same thing, saying that dropping to Line2x makes the audio work, but this affects the aspect ratio. It's not the switch, on the side, as I know of it's use, and I use it for the Dreamcast when I use VGA input.
It's like the OSSC is seeing a resolution that wouldn't have audio in it and disables the audio processing side.
Have you tested multiple displays with it? C64 (PAL?) with Lumacode in 5x results to highly unusual timings which may not have full compatibility with many displays.
All the displays I tried were computer monitors. I tried a raspberry pi 15.4" monitor, a Lenovo 24" and a xiaomi 34 ultra wide. The only way I've been able to get sound is via directly connecting speakers to the c64. It's a PAL unit.
On Mon, Jun 30, 2025, 10:04 PM marqs85 @.***> wrote:
marqs85 left a comment (marqs85/ossc#125) https://github.com/marqs85/ossc/issues/125#issuecomment-3020717609
Have you tested multiple displays with it? C64 (PAL?) with Lumacode in 5x results to highly unusual timings which may not have full compatibility with many displays.
— Reply to this email directly, view it on GitHub https://github.com/marqs85/ossc/issues/125#issuecomment-3020717609, or unsubscribe https://github.com/notifications/unsubscribe-auth/AIHYIBASHRWBRL4IWDW7SL33GGQ4PAVCNFSM6AAAAACAOPIYWWVHI2DSMVQWIX3LMV43OSLTON2WKQ3PNVWWK3TUHMZTAMRQG4YTONRQHE . You are receiving this because you authored the thread.Message ID: @.***>
Cannot reproduce the issue on my PG27AQDM, but 480p/576p pillarbox option is added in 8c0a0c181d6a5f479540b534d402ab341cfebad9 which can help with the AR in Line2x if the display supports the new mode.
Would be good to check if the matching modeline below (from PC HDMI) is able to produce sound.
Modeline “C64PAL_lc_x5” 157.50 1920 1968 1992 2016 1080 1280 1295 1560 -hsync -vsync