Re: DOSBOX partition size limit: 512MB? Or I am doing something wrong?
Posted on 2025-04-26, 16:21
As this is the official DOSBox forum discussion of forks is off-topic.
Re: DOSBOX partition size limit: 512MB? Or I am doing something wrong?
Posted on 2025-04-26, 00:53
I made a DOS 6.22 install on DOSBox with 512,63,255,1024 geometry and it worked fine. Using a size that large is definitely asking for trouble - as I mentioned earlier, DOSBox uses regular buffered file I/O functions (fseek, ftell, fread, etc.) which do not handle file offsets larger than 2GB. Any …
Re: DOSBOX partition size limit: 512MB? Or I am doing something wrong?
Posted on 2025-04-25, 15:58
wierd_w wrote on 2025-04-25, 15:01: So, 'an actually 2GiB volume' has an ECHS geometry of 512, 32,128,1024 There are very valid reasons for not wanting to have exactly the max cyl count. The most valid reason is that 1024 doesn't fit in 10 bits, making it an invalid value.
Re: DOSBOX partition size limit: 512MB? Or I am doing something wrong?
Posted on 2025-04-24, 11:23
vanfanel wrote on 2025-04-24, 10:28: Maybe DosBOX is really limited to 512MB images? It's not. In theory it can support up to 8GB by using 512,63,255,1023 but depending on the build, the filesystem functions used by the linked C library will probably only handle image files up to 2GB. In either …
Re: Rant "Requires Windows"
Posted on 2025-04-23, 15:23
They can also have the program do a check at startup for the Windows version and if below the required version, it gives a popup stating the minimum version required. That is a super simple check and it is really annoying running programs and it crashing with a useless error or just not doing …
Re: Rant "Requires Windows"
Posted on 2025-04-23, 08:14
It's because half the time, the people producing the software don't even realize - they just use Visual Studio's default target which uses a windows 10 SDK, making the output program incompatible with anything earlier.
Re: DOS-compatible Descent 1 and 2 source ports?
Posted on 2025-04-15, 08:59
The mac version was basically the same as the PC version when the "-640x480" parameter was used, it had the cockpit mode disabled / didn't have any new graphics assets. Apart from CD audio the only extra "feature" it had was mouse control for the menus.
Re: NVIDIA's 32-Bit PhysX Waves Goodbye with GeForce RTX 50 Series Ending 32-Bit CUDA Software Support
Posted on 2025-04-07, 11:29
Why drop 32-bit PhysX/CUDA specifically, though? They could drop entire 32-bit support, if they wanted, right? No more 3D for 32-bit apps! Probably because those libraries require the biggest workarounds to get 32-bit apps talking to a 64-bit driver, especially with regards to memory allocation/ …
Re: HP LX200 null modem serial connection
Posted on 2025-04-01, 12:31
USB Serial adaptors can have very "loose" timings at low/high baud rates. Try something more standard like 19200.
Re: Ways to run a polling background TSR when running games that override timer interrupt without chaining?
Posted on 2025-03-18, 12:37
Then how do you return from your handler? The old handler will have already popped off the needed data so you can't use IRET... You can't return via a branch instead because you need to restore flags and the original segment atomically.
Re: Ways to run a polling background TSR when running games that override timer interrupt without chaining?
Posted on 2025-03-18, 12:06
You would need to set up the stack appropriately (with a return address, segment and flags) so that the original vector's IRET ends up "returning" to your code.
Re: Is it not possible to edit an MT-32 through DOSBox?
Posted on 2025-03-13, 06:44
You have to remember DOSBox is only intended for games, and there certainly aren't many (if any) that make use of midi in.
Re: Mini ISA ROM Card
Posted on 2025-03-12, 19:22
The best price I could find for a DOC was $10. I can live with that but finding a card that takes DIP32 ROMs seems like it might be more challenging. IIRC there are 5V UV EPROMS that go up to 4MB, but they're 42-pin DIP. Obviously you'd need a GAL or similar (like what is shown on the DOC) to …
Re: Do old 5.25 floppy games work in pure DOS mode?
Posted on 2025-03-05, 17:47
You might find this useful.
Re: CRT Terminator Digital VGA Feature Card ISA DV1000
Posted on 2025-03-05, 10:30
I guess if it's 96% used, you definitely don't have room for a 65536 (256x256) byte LUT to avoid multiplying...
Re: CRT Terminator Digital VGA Feature Card ISA DV1000
Posted on 2025-03-05, 05:51
Here's a detail view of how DOSBox, for example, handles 640x350 upscaled to 1600x1200: dosbox_640x350_1600x1200_detail.png I'm not really sure what this type of scaling is called. But it seems to involve shading a little around the edges of the pixels so that they appear perfectly even to the eye …
Re: Override mount directory within a program
Posted on 2025-03-03, 23:17
In the documentation (Yes, I actually read it) it strongly advised against using "mount c c:\" for safety reasons. Yes, because it gives the DOS programs access to your entire drive. But that's exactly what you're trying to do anyway, by escaping the sandbox imposed by only being able to access …
Re: Override mount directory within a program
Posted on 2025-03-03, 22:29
I'm struggling to understand what you're actually trying to do. From your opening post, why not just use "mount c c:\" if you don't want extra path translation steps?
Re: Which New HDDs R Still Made as 512e(or 512n),thus Usable as Spare/Upgrade Parts for Legacy PCs & Legacy OSs.
Posted on 2025-02-24, 08:40
A drive has to be one or the other, it can't support both sector sizes.
Re: Which New HDDs R Still Made as 512e(or 512n),thus Usable as Spare/Upgrade Parts for Legacy PCs & Legacy OSs.
Posted on 2025-02-24, 07:07
You can put an MBR partition table on any 512b sector disk, it just limits the partitions to being within the first 2TB. But typically what is done is one of the MBR partitions points to a GPT that has all the "proper" partitions.
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