Re: PowerVR Fun Thread

Posted on 2022-03-23, 15:33

by

by javispedro1

in Marvin \ Video

in Marvin \ Video

Interesting. Seems to include sources for the D3D/DDraw driver under MIT license. I don't remember if there was a sample driver available for this. Not sure which pieces are missing, though. Can't find the Win9x VXD.

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Re: Issues running VirtualBox & Win98

Posted on 2022-03-23, 14:16

by

by javispedro1

in PC Emulation

in PC Emulation

No surprise, Windows 98 is a supported guest OS on VirtualBox. Sorry what do you mean "permissions crap " ? On the guest -- Windows 98 ? Or is it a VirtualBox error ? The USB 1.1 controller should be recognized by Win98's builtin OHCI driver, no drivers required.

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Re: Accessing the parallel port registers - DOSBox-X

Posted on 2022-03-23, 14:01

by

by javispedro1

in DOSBox General

in DOSBox General

I am not sure if you can configure DOSBox-X to forward I/O access to real IO ports. However, it is likely trivial to implement, specially if you already know C. I see they tried to do that already for Adlib passthrough and for LPT passthrough in Windows (but it is all commented out). Under Linux, …

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Re: Dual-booting DOS 6.22 FAT32 & Win98SE FAT32 On Same HDD?

Posted on 2022-03-22, 23:25

by

by javispedro1

in Marvin \ Software

in Marvin \ Software

If you are already using a boot manager (say grub4dos) you don't have to install Windows on "letter" D: (which is another compatibility nightmare) , and you don't need to have only one visible primary partition. Just boot from the desired partition's boot record. As far as I can see, on win9x the …

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Re: UNISOUND - Universal ISA PnP Sound Card Driver for DOS v0.77a

Posted on 2022-03-19, 16:35

by

by javispedro1

in Marvin \ Sound

in Marvin \ Sound

After setting it up, I noticed that there's a difference in sound between ES1868 and ES1869, as if there's a high pass filter on the latter. I've checked different bands\models In ES1869 datasheet there's a mention about "3D Spatializer" which I believe is responsible for the quality loss. The …

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Re: Why did they rush Windows 11?

Posted on 2022-03-19, 16:11

by

by javispedro1

in Milliways

in Milliways

Compatibility layers will always have an overhead. That's just not true at all, mostly because "compatibility layer" is a very loosely defined thing. Technically I could even argue than any Win32 application runs under a "compatibility layer" even in Windows. You should not think that it's adding …

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Re: Why did they rush Windows 11?

Posted on 2022-03-19, 02:28

by

by javispedro1

in Milliways

in Milliways

A related question is why they suddenly backed down on their promises of Windows 10 being the "last point version of the operating system". I would even venture and guess the answer to these questions has something to do with the significant increase in the hardware requirements, in an era where a …

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Re: Converting modern video files to older formats

Posted on 2022-03-18, 14:51

by

by javispedro1

in Marvin \ Video

in Marvin \ Video

MPEG1 is also builtin since Win95, at least starting with OSR2 / ActiveMovie. Some of the sample video files in the Win95 CD where mpeg1. I tried ffmpeg's mpeg1 encoder (mp2 for audio) and it works with Windows 95, so at least you can use something more recent than Cinepak. ffmpeg -i input.mp4 -vf …

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Re: Converting modern video files to older formats

Posted on 2022-03-16, 13:36

by

by javispedro1

in Marvin \ Video

in Marvin \ Video

I don't know what codecs you tried .... the only time I remember having problems is when I tried to encode to WMV9 (using FFmpeg) to play on a PocketPC, and that didn't work (ffmpeg had no wmv9 encoder at the time), and I had to resort to a XP VM with the MS Windows Media Encoder 9 tool to do the …

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Re: Windows 3.11 and USB mouse

Posted on 2022-03-01, 13:23

by

by javispedro1

in Marvin \ General Old Hardware

in Marvin \ General Old Hardware

So, sure, everything discussed in this forum is an obsession, but let's keep it real that if it's just about playing Monkey Island, there are really simple, cheap solutions? The other day I threw away the mouse I was using to play Monkey Island because the optical sensor was getting repeatedly …

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Re: Windows 3.11 and USB mouse

Posted on 2022-03-01, 12:00

by

by javispedro1

in Marvin \ General Old Hardware

in Marvin \ General Old Hardware

Sphere478 wrote on 2022-03-01, 04:33: It (the bios) supports usb keyboard but usb mouse is not working I haven’t tried the keyboard on usb in win 3.11 though. So it supports a USB keyboard, but not a USB mouse, and there are no USB related options in the BIOS at all ? Well that's new 😜

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Re: Windows 3.11 and USB mouse

Posted on 2022-03-01, 11:38

by

by javispedro1

in Marvin \ General Old Hardware

in Marvin \ General Old Hardware

The prerequisite is that the mouse itself must be recognizable by BIOS/CSM as standard USB mouse. Some recent mice are too advanced to be recognized as standard mouse and they'll never work under BIOS/CSM. I also had USB mice that behaved erratically (like wrong X/Y axes) when operating in BIOS/CSM …

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Re: Windows 3.11 and USB mouse

Posted on 2022-02-28, 16:24

by

by javispedro1

in Marvin \ General Old Hardware

in Marvin \ General Old Hardware

The keyboard/mouse worked fine via ps/2 emulation up until the Windows 98 started up, detected the USB controller etc. Then it was gone. Normally, that would be fine, but.. Lol. I had a machine with the same problem, but fortunately copying files to the HDD beforehand made it stop prompting at that …

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Re: Windows 3.11 and USB mouse

Posted on 2022-02-28, 15:08

by

by javispedro1

in Marvin \ General Old Hardware

in Marvin \ General Old Hardware

There is a reason most people do not ask this type of questions about USB mouse drivers for DOS. BIOS PS/2 emulation is good enough up to the point most people don't even notice that DOS/Win16/Win95 is not supposed to work with USB mice. USB BIOS usually use SMM or the like so it's practically …

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Re: Windows 3.11 and USB mouse

Posted on 2022-02-28, 14:19

by

by javispedro1

in Marvin \ General Old Hardware

in Marvin \ General Old Hardware

Literally yesterday I was working on a Windows 3.x driver for VirtualBox's mouse integration (which is a PCI device). https://git.javispedro.com/cgit/vbmouse.git/tree/ A good bunch of this driver is in C (unlike the other drivers I know -- including vmwmouse above -- which are in assembler) so it …

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Re: VIASBCFG - VIA SBPro configuration tool for VIA VT8231 & VT82C686/A/B chipsets (v0.12d)

Posted on 2022-02-27, 21:33

by

by javispedro1

in Marvin \ Sound

in Marvin \ Sound

Any plans to release the source of this tool ? I am interested in making some experiments regarding my issues with monkey island (I think they are related to the way VSR is initialized in the codec), but also about how volume control works. For example, I have found that VIASBCFG /VXX seems to be …

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Re: Some experiments on NT 3.51 software compatiblity.

Posted on 2022-02-24, 17:55

by

by javispedro1

in Milliways

in Milliways

KeSetSwapContextNotifyRoutine sounds like the one which sets the task switching callback (which will run FXSAVE). Sadly the fact it is lacking may be a dealkiller. Since KeSetAffinityThread doesn't exist on NT 3.51 I've been looking for alternatives that can be used, to configure the registers on …

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Re: Some experiments on NT 3.51 software compatiblity.

Posted on 2022-02-24, 14:27

by

by javispedro1

in Milliways

in Milliways

Do you know what kernel symbols are missing ? I can see that FXSAVE opcode is present in INTLFXSR, so my wild guess is that NT4 has a private API that allows setting a task switching callback . This would be very heavyweight so I rather doubt they would put this API in NT3 for no reason, but it does …

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Re: Tiny Vortex86-based DOS gaming PC - weeCee

Posted on 2022-02-23, 14:42

by

by javispedro1

in Marvin \ System Specs

in Marvin \ System Specs

NachtRave wrote on 2022-02-23, 14:23: and same issue: it gets to the Win98 boot screen and dies out. I suspect even if I used an image you provided me it would do the same thing. Out of curiosity, does it boot in Safe mode ? It will use the BIOS routines rather than WIn98's IDE driver. Not sure …

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Re: Some experiments on NT 3.51 software compatiblity.

Posted on 2022-02-23, 12:53

by

by javispedro1

in Milliways

in Milliways

During the progress he encountered an issue that there were SSE opcodes in the executable, which NT 3.51 cannot run out-of-box, as the CPU needs to have some registers set before it could run SSE instructions, and that requires kernel mode code (such as drivers). After setting those registers, he …

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