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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 …

Re: Rare and lost demo/shareware releases wanted list

Posted on 2020-11-11, 21:46

in Milliways
Alright then, here is the floppy disk installer for "2 Fast 4 You", zipped straight from the CD: BIFIDISK.ZIP On a related note, this archive seems to be not quite the same version that's on my CD. Except for a missing README.TXT file and the DISK subdirectory I attached in the ZIP file, all the …

Re: Rare and lost demo/shareware releases wanted list

Posted on 2020-11-10, 23:17

in Milliways
I happen to own an original CD-ROM copy of "2 Fast 4 You". Bought it some time ago on a flea market, so I can't say for certain if this CD was actually sold for money at any point. What I have is just the CD in its original jewel case. There is no bar code anywhere on the case, and it actually says …

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

Posted on 2020-10-06, 22:32

I'd rather not. I don't own Golden Axe for the PC and I know nothing about its code. To write a fix like this, I would have to reverse engineer large portions of the game code to find out which code is responsible for the scrolling and what code would be safe to overwrite with new code for the fix. …

Re: Mystic Towers music/soundfx stops playing after 10 seconds

Posted on 2020-09-28, 20:31

in DOS
Yep, setting the base I/O address to 220 will definitely help. Further analysis showed that even though the code parses the BLASTER string and sets the base address variables accordingly, there are still a couple of instances in the code that are hard-coded for base address 220 and prevent the …

Re: Mystic Towers music/soundfx stops playing after 10 seconds

Posted on 2020-09-28, 05:48

in DOS
If you get sound, then the address is not the problem. The sound stopping after a while might indicate an IRQ issue, but 10 seconds seems way too long for that. The only advice I can give is to make sure that the BLASTER environment variable is set up correctly, since that's what the game uses when …

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