VOGONS


First post, by vanfanel

User metadata
Rank Member
Rank
Member

Hello,

I just got a relatively cheap, fanless, brand-less minipc from Aliexpress that has this old Celeron 2955U CPU.
It has Haswell graphics, apparently.

It's ALMOST good! It has some good things going for it in regards to native DOS:
-DOS boots natively: has good CSM support.
-EMS works perfectly well with EMM386 and JEMMEX!
-SBEmu works! So yeah, it has OPL and digital audio in DOS games and programs!
-Scrolling registers work well: Prehistorik 2 scrolling map is flawless, Superfrog works perfectly well, Jazz Jackrabbit also works well... That sums up my "test suite" for games which ask good DOS support to the hardware and it passes them all! Wow!

But here's the catch: it insists on using a 60Hz mode for 320x200 games, so some games like Lemmings 2, Tyrian, etc.. have slow music.

I know that there's the VGA60HZ TSR: https://github.com/wbcbz7/dos-vga-tsr-goodies … /master/VGA60HZ
...But what I would need is the opposite: I would need something that tells the CRTC registers that 320x200 IS a 70Hz video mode!
Is there such a thing? Can you guys shed some light here?

Thanks!

Reply 1 of 2, by keenmaster486

User metadata
Rank l33t
Rank
l33t

Does your monitor natively support 70Hz? I don't know if there even is an LCD panel that supports 70Hz. Afaik they're all either 60 or 75, or something much higher.

World's foremost 486 enjoyer.

Reply 2 of 2, by vanfanel

User metadata
Rank Member
Rank
Member
keenmaster486 wrote on Yesterday, 19:08:

Does your monitor natively support 70Hz? I don't know if there even is an LCD panel that supports 70Hz. Afaik they're all either 60 or 75, or something much higher.

I'm using an OSSC, it eats 70Hz for breakfast, so yes.
It seems to be something with the VBIOS on this PC, which as things are, insists that all DOS modes including VGA 13h (320x200@8) are 60Hz...

That's why I am looking to revert that via a TSR or similar.