IO Board and Direct modes don't work

[shazz]

Hi,

Mostly all the cores work on my Sony PVM14N5U more or less (sometimes the screen scrolls vertically, buggy display or double display for cores with higher horizontal freq) but the Atari ST core just freezes, black screen, "No signal" and no way to go back to the menu or load another core, looks to crash MiSTer.

Tested configurations:

• Sony PVM14N5U Composite and S-Video inputs
• IO Board 5.5, SOG enabled, 5V jumper, VGA-to-composite adapter
• HDMI to VGA adapter, VGA-to-composite adapter
• Release: AtariST_20200818.rbf

Thanks!

[StalkS-24x7]

Same Here - Sony BVM

[sorgelig]

Most likely your monitor simply doesn't support this core video. Try HDMI (not direct video) output.

[shazz]

This core with HDMI works for sure on a modern monitor but not as interesting :)

Testing various cores, it looks like my Sony PVM doesn't support any horizontal frequency, I cannot find the detailed specs to see where the limit is.

The Atari ST is one of the few cores I cannot manage to run on "VGA" and Direct-mode. But which horizontal frequency is the Atari ST core using?

I tried other cores supposed to be at > 15KHz:

• Apple II core works (and seems to be at 30.62 KHz)
• Lunar Lander: doesn't work well, double display
• 1 942: works (37.77 KHz)
• Lode Runner: works (37.8 KHz)
• Space Invaders: works (37.8kHz)
• Vectrex: doesn't work but show things
• BBX Micro: works (62.5kHz ?)
• MacPlus: doesn't work but display things (22.06kHz)

[sorgelig]

with forced_scandoubler=1 it generates 50Hz/31.34Khz and 60Hz/31.60KHz

[ArchiveRL]

Problem is, original Atari ST can output 15Khz. I have 1040STFM and it works fine on my CRT TV via SCART RGB. That's how most people used them back in the day, or via composite/RF.

Meanwhile the core seems to output only 31khz. So when I try it on the same TV via Direct Video, it doesn't work.

[sorgelig]

Core outputs 15Khz when forced_scandoubler=0
Although in monochrome mode it outputs 70Hz/35KHz regardless forced_scandoubler state - this is original ST design behavior.