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Re: Alien Carnage/Halloween Harry sound problems

Posted on 2021-03-28, 20:28

in DOS
One patch wouldn't be enough, though. Alien Carnage/Halloween Harry consists of 16 different executables (HARRY0.-0 to HARRY99.-0) and every single one of them would need to be patched. A generic "find this sequence of bytes and modify it" sort of patch might work, but it could also mess up …

Re: Keen 4-5-6 choppy scrolling on EGA card

Posted on 2021-03-23, 22:16

Glad to hear you found a workaround for the problems you were experiencing. I still can't think of a good reason why Keen Dreams would run fine while Dave 3 and 4 (with the 35 fps patch) have issues on the same system. But now that you mention Setmul, is this how you've been running Dave 3 and 4 all …

Re: Keen 4-5-6 choppy scrolling on EGA card

Posted on 2021-03-11, 23:09

That doesn't really make sense. With these patches applied, the basic frame timing in Dave 3 and 4 should be more or less the same as in Keen Dreams, and the code that updates the CRTC start and panning registers of the video card (i.e. what actually makes the scrolling happen) is exactly the same …

Re: Keen 4-5-6 choppy scrolling on EGA card

Posted on 2021-03-10, 21:57

Alright, then you might as well try these patches for Dave 3 and 4: # Dangerous Dave 3 - Dave's Risky Rescue v1.00 (Rev 1.04): %exefile DAVE.EXE 207760 %patch $1451D $02 # set minimum frame time to 2 tics at 70 Hz (=> 35 fps) # Dangerous Dave 3 - Dave's Risky Rescue v1.01 (Rev 3): %exefile DAVE.EXE …

Re: Keen 4-5-6 choppy scrolling on EGA card

Posted on 2021-03-09, 00:33

The technology in Dave 3 and 4 is relatively close to what was used in Keen Dreams, but there are a few differences. I think the most important one is that Dave 3 and 4 will run at up to 70 fps while Keen Dreams is capped at 35 fps (as are Keen 4-6). Since you're using a relatively fast machine, the …

Re: Duke Nukem Joystick Problem

Posted on 2021-01-15, 22:47

Duke is always moving to the right unless I actively try to change directions to the left. Yup, that's definitely a speed problem. Joystick input is always CPU-speed-sensitive by design. To read the analog values of the x/y axis, the code basically has to count how many times the CPU can read the …

Re: Coding help

Posted on 2021-01-01, 23:10

Inter-process communication probably won't be possible unless you are talking about two programs/processes that you programmed yourself. The only value a DOS program can "return" is a simple integer value (the ERRORLEVEL value used in batch files). You could also hijack environment variables for …

Re: How did scrolling work in Keen 4-6?

Posted on 2020-12-19, 23:42

in Milliways
CGA cards generally only had 16k of video memory. That's just tiny bit larger than what is needed to store one single screen of 320x200 pixels at 4 colors (or 640x200 pixels at 2 colors). 4 colors means that you need 2 bits per pixel to store that color information (2² = 4). At 320x200 pixels, that …

Re: How did scrolling work in Keen 4-6?

Posted on 2020-12-19, 21:36

in Milliways
dual-page feature of EGA. I'm not sure what you're talking about, and I don't really see anything particularly helpful in the video you linked to. What is "dual-page" supposed to mean? If you're referring to the concept of having (at least) two full screens or "pages" in video memory (i.e. double …

Re: Let's talk about our hated trends

Posted on 2020-12-18, 23:19

in Milliways
Who remembers all the controversy over George Lucas endlessly modifying his SW movies? There is still, as far as I'm aware, no legal way to view the original 1977 film that won all the awards and caused all the buzz. However the original 1977 Star Wars is hugely important from a film history POV, …

Re: DOS anti-virus recommendation

Posted on 2020-12-13, 00:42

The built-in antivirus in Windows 10 can still detect the old DELWIN virus (infected files as well as infected boot sectors). Your mileage may vary, I guess, but I also don't see the point of removing any virus definitions from the antivirus database. Any halfway decent antivirus software should (in …

Re: Missing conventional memory

Posted on 2020-12-12, 22:36

You can also use DosZip to browse the entire 1 megabyte of address space. Select File -> Memory Info from the menu, then just hit enter on any if the entries in the window. This allows you to browse the memory contents like a file, either in HEX mode or ASCII mode. Use the seek command to jump to a …

Re: Trident 9388 and DOS games

Posted on 2020-12-12, 22:14

I think it's a hardware bug. My Lifebook C325 shows exactly the same symptoms. I solved most of it by changing to video mode 0x13 (320x200 pixels, 256 colors) twice in a row, which fixes the garbled screen (Asterix & Obelix) and half-height (Inner Worlds title screen) issues displayed in the first …

Re: Duke Nukem Manhattan Project on Windows 10

Posted on 2020-11-23, 00:03

in Windows
... or you could buy the game on Zoom Platform for a fiver. It's the only store still selling digital downloads of the old Duke Nukem games. From what I've heard, "they have a perpetual license to sell the Duke games that Gearbox cannot revoke". I have never used Zoom Platform myself, so don't …

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