Main > Monitor/Video Forum
Soft-15KHz - slim new tool for 15KHz on normal vga cards
Ummon:
--- Quote from: SailorSat on February 25, 2008, 04:21:08 pm ---p.s. Radeon HD 2400 Pro works fine with custom resolutions (Pixel Clock needs to be 7.12MHz or higher)
--- End quote ---
That's about the lower limit for proper native res, yes?
SailorSat:
Yeah. WITHOUT custom resolutions you can't go below 352x288.
To get some lower resolutions you'll need a custom15kHz.txt
--- Code: ---;Remove some "too low" resolutions
remove 240x240
remove 256x240
remove 256x256
remove 256x264
remove 321x256
;ReAdd some "low" resolutions with higher pclock and (way) larger sync width
modeline '288x240@59.885' 7.12 288 332 392 448 240 243 246 265 -hsync -vsync
modeline '296x240@59.941' 7.12 296 338 392 448 240 243 246 264 -hsync -vsync
modeline '304x240@59.305' 7.12 304 344 392 448 240 243 246 264 -hsync -vsync
modeline '321x240@59.014' 7.12 321 350 392 448 240 242 245 264 -hsync -vsync
modeline '336x240@59.749' 7.12 336 356 392 448 240 243 246 264 -hsync -vsync
--- End code ---
Silver:
--- Quote from: SailorSat on February 25, 2008, 04:21:08 pm ---p.s. Radeon HD 2400 Pro works fine with custom resolutions (Pixel Clock needs to be 7.12MHz or higher)
--- End quote ---
Ah, I wondered if newer cards were going to end up increasing the pclock floor....
powerstrip used to have a 10Mhz pclock floor inbuilt, and then a 5Mhz one - it should be a bit lower than that now, can't rememner what we ended up with. I thought it was my cards hitting the floor for a while.
I know plenty of radeon cards - 9700/x800 etc... seem to happy to go to down 5Mhz pclock or lower without very large sync widths to fake it, perhaps it would be good to keep a record which modern cards can't cut it.
I think the lowest resolution must be 240x192 for mrdo, or something similar.... I think you need to go under 5Mhz pclock for that (or use massive syncs...)
Silver:
Incidentally, I meant to post this before in case anyone found it useful.
Here is a list of all the resolutions and refresh rates used in mame (0.123) according to listinfo.xml. I've put up 2 lists - one for vertical and one for horizontal, it excludes all clones, and counts the number of games that use a particular resolution & refresh.
http://forum.arcadecontrols.com/index.php?topic=77103.0
I've linked to a seperate post, as I realised it takes up a few screens worth(!).
SailorSat:
As for those 192 line modes, I don't really know how they work with 15kHz, as they would need something like 90Hz to get near. The only think I could imagine would be actually 192pixels per line, 240 lines per frame.
*EDIT* Actually it IS exactly that way. (If you double the 192 pix width you end up with 384x240)
Hm... Some resolutions are pretty much bogus...
704x513@60Hz (nclubv3) is just the resolution the system (ST-V) could output, but the game itselt just outputs 384x224 :(
1024x1024 also seems pretty much like some kind of "don't know" resolution.
671x216 is quite weird, but should fit nice into 720x480 or 640x240
504x296 should be possible, maybe added as 512x296 or 512x300 for better compatiblity.