Question about DOS 16 color modes.

Posted on 2022-01-30, 22:45

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by videogamer555

in DOSBox General

in DOSBox General

I know in 16-color modes, such as EGA (320x200 and 640x200) and VGA (640x350), you have normally have to put the bits in one bitplane at a time (using a control register on the graphics card via the OUT x86 instruction, to set the plane that you are about to copy the image data to). However I also, …

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What exactly is the phyical reading order of sectors on a magnetic harddrive?

Posted on 2022-01-24, 01:36

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by videogamer555

in PC Emulation

in PC Emulation

I know that sectors are addressed using a CHS scheme. C is the cylinder to read, and controls the positioning of the read-write head mechanism. Its lowest possible value is 0 (zero). H is the head (or track) on a given cylinder, and it selects which read/write head should be used for the read or …

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How much of the VGA graphics card hardware is emulated in DosBox?

Posted on 2022-01-17, 01:05

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by videogamer555

in DOSBox Development

in DOSBox Development

I was reading here about all the different VGA registers http://www.osdever.net/FreeVGA/vga/vga.htm and there are a LOT of registers. How many of these are actually implement in DosBox though? I would like to try writing some DOS software in assembly language, that would create some some exotic …

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Bug report regarding emulated graphics cards in latest SVN version

Posted on 2022-01-14, 04:32

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by videogamer555

in DOSBox Development

in DOSBox Development

I discovered these bugs in SVN version r4471. First bug involves emulated EGA card (as set in dosbox.conf). When running with an emulated EGA card, the Aspect option being set to true is ignored in text modes. That is to say, it doesn't force the text modes to have a 4:3 displayed aspect ratio. …

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Re: Why can't DOS (from a boot disk image) find the emulated CD drive?

Posted on 2022-01-13, 09:18

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by videogamer555

in DOSBox General

in DOSBox General

If you want to continue with 9x as a guest in DOSBox then you can copy the install files to the HD and install from there this also eliminates having to put in the CD whenever 9x prompts for it. That doesn't work. The largest HDD image that DosBox recognizes is about 500MB. The total size of all …

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Re: Why can't DOS (from a boot disk image) find the emulated CD drive?

Posted on 2022-01-13, 09:12

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by videogamer555

in DOSBox General

in DOSBox General

DOSBox provides CD support by emulating mscdex, not by implementing IDE hardware so loading an operating system means there will be no CD detected. I assumed that ALL disk images (floppy, cd, and hdd) mounted by the imgmount command, would be usable after the boot command was called. After all, if …

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Re: Why can't DOS (from a boot disk image) find the emulated CD drive?

Posted on 2022-01-13, 09:06

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by videogamer555

in DOSBox General

in DOSBox General

So called "abandonware" isn't supported at vogons. I wasn't asking for help with abandonware itself. I was asking for help with an OS, which I happened to have gotten from an abandonware site. I only mentioned the site so that others wanting to help me with the issue I was having could get the …

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Why can't DOS (from a boot disk image) find the emulated CD drive?

Posted on 2022-01-12, 22:44

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by videogamer555

in DOSBox General

in DOSBox General

First I should say, I'm using the LATEST SVN (not release) version of DosBox, as it has all the latest features not found in the release version (including some that I might need for what I'm trying to do). I'm not using any of the community forks that include unofficial mods, only the latest …

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Re: Does the Dosbox imgmount command support non-compressed VHD disk images?

Posted on 2022-01-12, 21:39

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by videogamer555

in DOSBox General

in DOSBox General

Does nobody know an answer to this question?

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Re: What would be a good high accuracy old PC emulator?

Posted on 2022-01-12, 21:36

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by videogamer555

in DOSBox General

in DOSBox General

Are you trying to find a "one size fits all" program? Actually that's exactly what I'm looking for, and here's why. I want to run Windows 95, but Virtualbox (though highly accurate) can't run it. It constantly gives an error, which I've determined through research means the CPU is too fast for …

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What would be a good high accuracy old PC emulator?

Posted on 2022-01-11, 11:45

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by videogamer555

in DOSBox General

in DOSBox General

Since DosBox is good for emulating only Dos games, what would you recommend for emulating old PCs in general (like IBM and compatible PCs with 8088,286,386,486, and original Pentium CPUs), with high accuracy, and with realistic speed (not sped up due to the host PC being a multi-gigahertz processor …

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Does the Dosbox imgmount command support non-compressed VHD disk images?

Posted on 2022-01-09, 08:15

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by videogamer555

in DOSBox General

in DOSBox General

I know it doesn't support compressed disk images (such as compressed VHD files), but does it at least support non-compressed VHD files? Like does it actually read the header on these (VHD files are a Microsoft-invented disk image format that contains I think either a header or footer with all the …

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Re: Why can't I install Win95?

Posted on 2022-01-09, 08:09

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by videogamer555

in DOSBox General

in DOSBox General

Windows 9x isn't supported in DOSBox as a guest but if you wish to continue down this path for some reason then you need to mount a hard drive image just like any other emulation or virtualization software. So the emulated drive that corresponds to a host system folder, isn't going to work? That's …

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Why can't I install Win95?

Posted on 2022-01-09, 07:02

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by videogamer555

in DOSBox General

in DOSBox General

I don't expect Win95 to run properly on Dosbox, after it's installed, but I at least expect the installer to perform the installation. However, the installer keeps saying "Windows Setup requires 7340032 bytes available on your C: drive.". But there's a problem with that. First, my HDD has far more …

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Re: Have you guys considered adding PC-98 mode?

Posted on 2021-05-28, 20:14

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by videogamer555

in DOSBox Development

in DOSBox Development

The PC-98 (full name being PC-9801) is a computer made by NEC, and only ever sold in Japan. It does use an intel CPU, specifically a 16-bit Intel 8086. This is different than the IBM-PC, which had an 8-bit 8088 CPU, though unlike the next generation of IBM machines (which used 16-bit 80286 CPUs), …

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Re: Have you guys considered adding PC-98 mode?

Posted on 2021-05-28, 04:31

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by videogamer555

in DOSBox Development

in DOSBox Development

Caluser2000 wrote on 2021-05-28, 04:28: The 8088 is as 16 bit processor. 8086 is 16bit, while 8088 is 8bit. Both I think have 16bit address lines, but 8088 has 8bit data lines and 8bit registers, while the 8086 has 16bit data lines and 16bit registers.

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Have you guys considered adding PC-98 mode?

Posted on 2021-05-28, 04:23

by

by videogamer555

in DOSBox Development

in DOSBox Development

The PC-98 (full name being PC-9801) is a computer made by NEC, and only ever sold in Japan. It does use an intel CPU, specifically a 16-bit Intel 8086. This is different than the IBM-PC, which had an 8-bit 8088 CPU, though unlike the next generation of IBM machines (which used 16-bit 80286 CPUs), …

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86Box feature suggestion

Posted on 2020-11-17, 07:45

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by videogamer555

in PC Emulation

in PC Emulation

Here's a suggestion to the developers of 86Box. As of now, you can mix and match machine types and display types. For example, you can emulate a modern PC with an old ISA-bus MDA (monochrome display adapter), an impossible combination based on separate settings in the Machine and Display settings …

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Re: Is there such a thing as a usb-to-serial mouse converter?

Posted on 2020-10-12, 21:08

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by videogamer555

in Marvin \ General Old Hardware

in Marvin \ General Old Hardware

There are many projects about converting a ps/2 mouse signal to a rs232 mouse signal using a PIC or Atmel chip.. For USB, there are a few, too. https://www.versalent.biz/usbm232.htm https://hackaday.com/2017/10/09/a-converter-you-wont-have-ps2-mouse-to-serial-mouse/ https://m.youtube.com/watch?v= …

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Is there such a thing as a usb-to-serial mouse converter?

Posted on 2020-10-08, 23:31

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by videogamer555

in Marvin \ General Old Hardware

in Marvin \ General Old Hardware

This isn't about DOSBox, but rather about using a modern mouse on a vintage computer. Is there such a converter, aimed at the "vintage computer collector" market? My thought is this. It would consist of a box that would contain a microcontroller, that would have a USB port to plug in a modern mouse, …

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