VOGONS

Search

Common searches

Search results

Display options

Display options

Re: Digger and Hercules Graphic, using CGA Emulation

Posted on 2016-08-31, 16:45

in DOS
The second line is only necessary on true blue IBM CGA cards since you must set the border to a nonblack color in 80-column text mode or you'll get a B&W picture (a hardware bug that does not occur on the PCjr, Tandy, and all CGA clones) This is only for composite. And the reason for this is that …

Re: Digger and Hercules Graphic, using CGA Emulation

Posted on 2016-08-31, 16:39

in DOS
Vertical retrace causes problems on VGA too because it's 70Hz on there while CGA is 60Hz. While this won't prevent games from running, a lot of them like Alley Cat and Sierra titles have choppy animation. In the case of Hercules, you have a bigger problem because the refresh on there is 50Hz ( …

Re: PowerVR Fun Thread

Posted on 2016-08-30, 12:49

Tuxality wrote: It's not done yet, but I'll just implement software rasterizer from scratch that works like PCX2 after reverse engineering meaningful registers. Yea, would be great if it actually renders with the same quality as a real PCX2.

Re: PowerVR Fun Thread

Posted on 2016-08-30, 12:28

And how do you do the emulation? Are you building a software renderer that works exactly like the PowerVR? Or are you using VRAM and the registers to sniff out drawing commands and geometry/texture data, and feed that to OpenGL/D3D/Vulkan or such?

Re: 386 posts!

Posted on 2016-08-30, 09:26

in Milliways
FPU is used for fast memcpy routines only. Later this was not recommended anymore as it slows down task switching on multi tasking OSes due to the required FPU state save. But I don't think CD2 uses it, because I'm pretty sure I ran it on my 386SX without FPU, and it worked fine. Besides, afaik …

Re: 386 posts!

Posted on 2016-08-30, 08:55

in Milliways
elianda wrote: Yeah it enables the awesome mandelbrot zoomer in crystal dream 2. Are you sure? I thought that ran on my 386SX as well. FPUs are far too slow for demo effects on anything below a Pentium.

Re: PowerVR Fun Thread

Posted on 2016-08-30, 06:44

Tuxality wrote: I managed to get SGL and Direct3D to work on my emulated NEC PowerVR PCX2 card! 😀 😀 😀 Ossom! So what did you have to do to make it detect the card? Was it trying to read some special kind of identification string or such?

Re: FM and PCM Volume Balance of SB Cards

Posted on 2016-08-29, 09:56

I've had an SB Pro v2 in my machine for years, and I basically always had the mixer flatout on the FM and DAC channels, and controlled the overall volume with the dial on the back. The SB Pro's mixer was designed to have the same balance between FM and DAC as the earlier SBs had 'hardwired', so …

Re: PowerVR Fun Thread

Posted on 2016-08-29, 07:51

I got SGL to work in Windows, and wrote some simple code with it: https://www.youtube.com/watch?v=azfQHgUKOrk Do you have the SDK? I believe it is posted here on Vogons somewhere. I can give you my code, so you can play around with it (Visual C++ 6.0): https://www.dropbox.com/s/2ir10zpnbp27lj5/SGL. …

Re: IBM PC hardware clock division (XT 14MHz clock)?

Posted on 2016-08-28, 14:09

in PC Emulation
The video card emulation(VGA-based) is unchanged, able to function as a VGA, CGA, MDA and Tseng ET4000/ET3000 graphics cards. Technically, VGA in EGA/CGA/MDA mode is not the same as native EGA/CGA/MDA hardware, because both the refresh rate and the actual resolution are different. Aside from that, …

Re: How fast is the nec v20 compared to a 286?

Posted on 2016-08-27, 17:51

in Milliways
Accurately as I've described, games playing around the right speed vs not. As I say, DOSBox can't play certain software, including games, accurately. Especially with more complex stuff, such as 3d calculations in flight simulators etc, DOSBox is very inaccurate. For a simple game like Commander …

Page 143 of 226

Go to top of page Go to top of page
Close window
Close window