Re: Real hardware DOS gaming console for HDMI displays
Posted on 2020-12-10, 06:29
Jazz Jackrabbit is not a 320x200 game, it's a 320x240 game (square pixels) that uses letterboxing to achieve an active display area of 320x199.
Re: Real hardware DOS gaming console for HDMI displays
Posted on 2020-12-10, 01:28
Even with VT-d current CPUs can execute basic instructions differently from older CPUs if undefined behaviour is invoked, which some games rely on.
Re: What is good puzzle design in adventure games?
Posted on 2020-12-05, 16:27
Good example of a terrible puzzle is near the end of Police Quest 4, where Spoiler you get into the bad guy's "lair" not by using any sort of police work, but by going to an unrelated location and chasing a loose dog that just happens to appear.
Re: dynrec vs. secure platforms - opinions wanted
Posted on 2020-12-05, 16:23
Apparently the dosbox-x guys are also experimenting along similar lines, if I correctly interpret what I saw in their repository. Yes, obviously they were "inspired" by me mentioning memfd_create and how to use mach_vm_remap . A shame it was rather rushed and not discussed here like I suggested as …
Re: dynrec vs. secure platforms - opinions wanted
Posted on 2020-12-05, 13:11
Apparently rather than discussing possible solutions, other people just want to be told what works so they can slap it in their project and take credit for figuring it out.
Re: Is there a trick to stop games dumping stuff in C:\ ?
Posted on 2020-12-04, 16:45
Use subst to create a virtual drive, install on that?
Re: SATA to Micro SD adapter questions
Posted on 2020-12-04, 12:46
They're slow as hell (far slower than a regular SATA HDD) and will often pretend the disk is uninitialized if the first partition isn't FAT32 or NTFS.
Re: DOSBox-X branch
Posted on 2020-11-29, 05:48
That's the thing... where did you find out about mach_task_self()? I couldn't find anything about that. The most useful resource I could find was the MIT site that described what it *does*, the next problem was *how do you refer to your own task*. Neither that site, nor Apple's, nor anyone else on …
Re: DOSBox-X branch
Posted on 2020-11-29, 04:46
And yet, nobody describes how the hell you get your own VM map handle whatever-the-hell-it-is for yourself so you can use it. It's designed to map memory from one task (process) into another (possibly different) task. The vm_map_t arguments refer to the source and target tasks. We want the source …
Re: DOSBox-X branch
Posted on 2020-11-29, 03:53
ChromeOS solves it another way. https://chromium.googlesource.com/chromiumos/third_party/kernel/+/179b15db55fc3642a8e9f0e97e15cfe8a74a406e Unless I'm overlooking something they are skipping over a much simpler solution: linux has memfd_create to associate an fd with memory, avoiding the shmem/ …
Re: DOSBox-X branch
Posted on 2020-11-28, 22:55
You can also not mix i686 and x86_64 inside one process. You can on windows. All 32-bit apps get loaded with a 64-bit code segment accessible to them, for communicating with the kernel (it's how WoW64 works). Since the segment value is hardcoded and x86 has unprivileged instructions to get a …
Re: DOSBox-X branch
Posted on 2020-11-28, 22:43
It looks like there is a Darwin/mach-specific task remap function to make exactly that kind of split mapping, because Apple themselves uses it on iOS to JIT compile JavaScript. However portability is a concern and there are Linux systems with the same restriction, so I may have to either implement …
Re: DOSBox-X branch
Posted on 2020-11-28, 12:38
This typecast is optimized out by VS2019's compiler in Release builds, causing only the low 32 bits to be written in any case and a crash when executing the dynamically generated code. DOSBox-X fixes the issue by explicitly masking the pointer by 0xFFFFFFFF for that test instead of relying on …
Re: Boxedwine (Wine on multiple platforms)
Posted on 2020-11-27, 19:30
FWIW, early 2000s/win98 era safedisc protection is pretty easy to bypass assuming the .bin files contain full 2352 byte sectors. It uses a different read command to check for its "bad" sectors, so all you need to do is manually verify the requested sector's CRC and return a read error if it doesn't …
Re: PowerPC Dynamic Recompiler (patch)
Posted on 2020-11-27, 02:59
It's based on DOSBox SVN. There are other changes required to get a working wii build.
Re: What game are you playing now?
Posted on 2020-11-26, 20:45
Surprisingly, vpool tests a lot of basic CPU emulation edge cases. I saw balls do a lot of crazy stuff while testing the DOSBox x64 dynrec...
Re: What game are you playing now?
Posted on 2020-11-25, 22:43
GL_NEAREST_MIPMAP_NEAREST makes everything nearest neighbor filtered, that includes the mipmaps being drawn in place of full sized textures when you stand far away. I know this. But OpenGL allows different filtering options for magnification vs. minification. GL_NEAREST_MIPMAP_NEAREST is only a …
Re: What game are you playing now?
Posted on 2020-11-25, 20:58
Does it use the same setting for both enlarging and reducing? I always prefer playing old games with nearest filtering for enlarging, linear for reducing.
Re: hdd replacment - sd card, cf card or scsi
Posted on 2020-11-25, 20:47
Given SIV is a Windows utility it should and does use the Windows header files. It should be obvious these are what should be checked rather than none Microsoft Windows header files. Further whenever I make an error in a post I correct it and feel others should do the same. Then maybe you should …
Re: hdd replacment - sd card, cf card or scsi
Posted on 2020-11-25, 11:09
No, 0x0E is PARTITION_XINT13_EXTENDED which SIV reports as "Xint13 Extended". Partition Definitions from winioctl.h #define PARTITION_XINT13 0x0E // Win95 partition using extended int13 services Given Win95 originally didn't support FAT32 (and the fact that FAT32 has its own types), it should be …
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