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Re: DOSBox-X branch

Posted on 2015-05-19, 18:05

Last time I looked, DOSBox only kept track of the CRT on a per-scanline basis, and only in CGA/EGA/VGAONLY configurations, not the default config. Doing rastersplits simply isn't even possible at all, cycle-exact or not I suppose the last sentence only applies to the default configuration, because …

Re: DOSBox-X branch

Posted on 2015-05-19, 13:11

Are they really that "exact", though? I keep thinking of BSNES/Higan , which aims for cycle-exact emulation of a much more primitive system and is much slower. Yes, especially on C64, a lot of graphics and sound effects require cycle-exact modification of certain registers. So in order for these …

Re: DOSBox-X branch

Posted on 2015-05-19, 09:35

And despite that I just found out a recent 2015 demo "8088mph" does some really bizarre things to CGA hardware that drives DOSBox's CGA emulation absolutely nuts. I reckon trying to emulate that one is mostly a lost cause. I have the impression that you'd need more cycle-accurate emulation than you …

Re: 486 DX2 in a 486DX Machine

Posted on 2015-05-06, 11:02

Maybe the poor performance are also guilty of integrated Paradise/WD 90C30 or mainly of ram? I'm not sure... I had a WD Paradise ISA card in my Commodore 386SX-16 (I think it was a 90C30 as well, not sure). When I built my own 486DX2-66 a few years later, I re-used that card until I could afford a …

Re: 486 DX2 in a 486DX Machine

Posted on 2015-05-01, 08:02

"Use Intel ODP486DX-33, ODPR486DX-33, DX2ODP66 or DX2ODPR66 to upgrade to 66 MHz Use Intel DX4ODP100 or DX4ODPR100 to upgrade to 100 MHz Use Intel PODP5V83 to upgrade to Pentium 83 MHz" Be careful with that list of options! These options are valid upgrades for the *CPU*, as they are all 5v- …

Re: If you could play any game for the first time ever again...

Posted on 2015-04-30, 13:52

in Milliways
Hum... those early adventures are most fun the first time, such as Monkey Island, Maniac Mansion, Larry etc. Also, games like Track 'n' Field and Dynablaster were TONS of fun :) I've never had as much fun as with those early games, which you could play with a group of friends. Track 'n' Field is so …

Re: Determining CPU Cycles?

Posted on 2015-04-30, 07:49

In short: the cycles-measurement is rather meaningless, because DOSBox is designed to treat every instruction as '1 cycle'. On real CPUs, there can be massive differences between execution times of different instructions, and even a single instruction can take shorter or longer depending on its …

Re: 486 DX2 in a 486DX Machine

Posted on 2015-04-29, 09:58

There is a special 'Overdrive' version of the DX2-66, which has a heatsink glued on. It is specifically meant for upgrading DX33-machines. The peculiarity lies in the special heatsink? There are other details... Wikipedia has a nice overview: http://en.wikipedia.org/wiki/Intel_80486_OverDrive So …

Re: 8088 MPH: We Break All Your Emulators

Posted on 2015-04-24, 08:26

in PC Emulation
I liked the full-motion video demo that someone did a few years ago. That was 8088 Domination by Trixter (MobyGamer): http://www.pouet.net/prod.php?which=63591 And 8088 Corruption before that (also Trixter): http://www.pouet.net/prod.php?which=13722 Trixter was also the initiator of this project, …

Re: 8088 MPH: We Break All Your Emulators

Posted on 2015-04-24, 08:24

in PC Emulation
The 1024 colour stuff is also great, but in a different way (less about coding, more artistically and exploiting the limited CGA hardware). The 1024 colours also required clever code to trick the CRTC into displaying that many colours. It starts a new frame every 2 scanlines. So you are technically …

Re: What Graphics Modes Can I Use With a 5151 Monitor?

Posted on 2015-04-17, 06:52

in Milliways
I guess there's some ATI Wonder cards that will support CGA on the 5151. I'm not 100% sure which models though. Yes, I have an ATi Small Wonder, which is a CGA/Plantronics/Hercules-clone. It can display CGA on an MDA/Hercules monitor without the use of SIMCGA or such (it can also do the opposite by …

Re: 8088 MPH: We Break All Your Emulators

Posted on 2015-04-11, 11:09

in PC Emulation
Tell that to CPC users who have to bother with 3 variants of the 6845 + 2 licensed clones :) http://www.cpcwiki.eu/index.php/CRTC Yes: HSync pulse width in characters (0 means 16 on some CRTC), should always be more than 8; VSync width in scan-lines. (0 means 16 on some CRTC. Not present on all …

Re: 8088 MPH: We Break All Your Emulators

Posted on 2015-04-10, 18:33

in PC Emulation
Here are two more articles on the demo, with background information on the 1k colour mode and the 16 KHz 4ch mod player: http://www.reenigne.org/blog/1k-colours-on-cga-how-its-done/ http://www.reenigne.org/blog/8088-pc-speaker- … r-how-its-done/

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