mame -switchres and CGA monitors

[codecrank]

Hi,

  I have a K7000 / jpac/ mame setup. Can someone please explain why vertical orientation games will not display properly ( scrambled / duplicated / etc ) when using "-switchres" ? how is the monitor able to interlace & display pac-man at 640x480 ( without -switchres ) but not at it's native resolution ?

   Horizontal games work great using -switchres , and because and the screen stability is perfect at native res, i would really like to use it for all games.

   Would I have to use per-game mame options ?

thanks !

[SailorSat]

Most likely because it doesn't run in native resolution.
I guess it starts up in 352x288 at 50Hz and your monitor can't sync to 50hz.

[codecrank]

According to the  service manual ( http://mirrors.arcadecontrols.com/OscarControls/arcadevga/19k7901.pdf , page 1 ) the K7000 supports 47Hz to 63Hz

 

SailorSat, Oh great video Guru, have pity on this humble newb and explain the relationship between resolution and refresh rate.

Thanks

[SailorSat]

Try running mame with "rotate 0" in mame.ini and "verbose 1".

Vertical games should run in 256/288/320x240 60hz like most other games do.
However MAME has a feature to "turn" vertical games by 90 degrees so the can be played on horizontal orientated monitors without turning your head.
Unfortunately the 256/288/320 part becomes the number of lines now, and MAME tries resolutions with those.
352x288 for example, but not every monitor works "out of the box" with it.

[codecrank]

ok, I been doing some reading (  Andy @ ultimarc has a great FAQ  http://www.ultimarc.com/monfaq.html )

Hfreq / vertical line count = Vfreq  ( ex: 15,000 hz / 240 lines = 62 hz )

what you said make sense,  15,000 hz /  320 = 46 hz : out of range for K7000 ( 47-62 Hz )

sounds like I sound get started a 2nd cabinet , for all the vertical orientation games
 

Thanks