Re: UniPCemu's 8086 vs newer CPU BCD instruction flags?

Posted on 2017-06-30, 15:46

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by vladstamate

in PC Emulation

in PC Emulation

But then. Why does the EPC 80186 invalidate those flags? They don't match up with the dumped results(which I assume are taken from a real 801/286. I'm thinking 80286, because it expects flags bits 12-15 to be zeroed(on 80286+, not on 80186/8 and earlier). That is most certainly the case. They did …

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Re: Any good x86 pc emulators?

Posted on 2017-06-11, 07:49

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by vladstamate

in PC Emulation

in PC Emulation

I do recommend UniPCEmu. It is fairly flexible and more important superfury puts in a lot of effort to make it accurate. I think that is the main common trait on CAPE and UniPCEmu: strive for accuracy. As for CAPE, I know I cannot beat PCEmu, DosBox, Bochs and others so instead of reinventing the …

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Re: UniPCemu Compaq Deskpro 386 emulation problems?

Posted on 2017-06-08, 18:40

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by vladstamate

in PC Emulation

in PC Emulation

Here is what I get:

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Re: UniPCemu Compaq Deskpro 386 emulation problems?

Posted on 2017-06-08, 18:14

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by vladstamate

in PC Emulation

in PC Emulation

superfury wrote: I've copied the first table from http://ryan.servehttp.com/tech/hardware/bios/compaqbios.htm to create the file. That page does not work for me. All I get is a nginx error.

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Re: Disk size to CHS geometry conversion?

Posted on 2017-06-08, 14:20

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by vladstamate

in PC Emulation

in PC Emulation

Do you support all those hard disk types? http://www.win.tue.nl/~aeb/linux/hdtypes/hdtypes-3.html

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Re: UniPCemu crashing on current commit?

Posted on 2017-06-06, 22:29

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by vladstamate

in PC Emulation

in PC Emulation

I do not think you can have same command number that means something both to the 8042 and the keyboard/mouse device attached. So based on the command you can figure out if it is for the keyboard or not.

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Re: UniPCemu crashing on current commit?

Posted on 2017-06-05, 23:26

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by vladstamate

in PC Emulation

in PC Emulation

I do not have the answers to these questions, I am sorry. I do not have a Deskpro 386 in my collection. And the information online seems sparse. Try asking at vintage computer forums (vcfed). There must be some owners there.

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Re: UniPCemu crashing on current commit?

Posted on 2017-06-05, 22:22

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by vladstamate

in PC Emulation

in PC Emulation

What is your documentation for the Deskpro 386? BOCHS port list?

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Re: UniPCemu crashing on current commit?

Posted on 2017-06-05, 13:25

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by vladstamate

in PC Emulation

in PC Emulation

If you can run in Linux or Android I would recommend Valgrind (http://valgrind.org/). It is the best tool for the job.

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Re: What game are you playing now?

Posted on 2017-06-05, 01:52

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by vladstamate

in Milliways

in Milliways

I just finished Mass Effect Andromeda (on PS4). Quality wise it was somewhere between Mass Effect 2 and 3 (with the 2 being the better one in my opinion). About 51 hours it took. There are still a few quests I did not do, but the main story is done.

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Instruction execution performance - try it!

Posted on 2017-06-04, 21:51

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by vladstamate

in PC Emulation

in PC Emulation

Here is something that might help other emulator writers out there. Since my emulator's unit of execution is a cycle it has some performance issues as a lot of host cycles have to be spent executing 8+ types of cycles for each emulated instruction. As such I need to improve that so for that I need a …

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Re: And this is one of the many reasons why I tell people not to use password managers.

Posted on 2017-06-04, 21:39

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by vladstamate

in Milliways

in Milliways

I use 1Password and I am really happy with it. It works well on all my devices (my iPhone, my windows machine and my various iMacs (at work and home)). The password file is on the cloud sure but it is encrypted pretty well to my knowledge: https://support.1password.com/1password-security/

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Re: x86 segment descriptor type checking?

Posted on 2017-06-04, 18:28

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by vladstamate

in PC Emulation

in PC Emulation

Yes I see what you mean, at page 108 there is definitely an error. Like you said, the HTML version is likely newer.

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Re: x86 segment descriptor type checking?

Posted on 2017-06-04, 14:46

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by vladstamate

in PC Emulation

in PC Emulation

It is 0 for data and 1 for code. Figure 6-1 in the link you gave has the correct bits for both data and executable segments. Do you mean a different image?

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Re: x86 segment descriptor type checking?

Posted on 2017-06-04, 13:40

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by vladstamate

in PC Emulation

in PC Emulation

Did you check more in the Intel's own doc for 386? https://pdos.csail.mit.edu/6.828/2012/readings/i386.pdf

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Re: Best DOS tycoons?

Posted on 2017-06-03, 21:29

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by vladstamate

in Milliways

in Milliways

Railroad Tycoon 2 was my favorite. It was polished and fun. GoG has it: https://www.gog.com/game/railroad_tycoon_2

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Re: Virtual Reality

Posted on 2017-06-01, 15:47

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by vladstamate

in Milliways

in Milliways

Yes, I have a HTC Vive and I am using it a lot. I mainly play Elite Dangerous. After playing it in VR, just seeing it on the screen looks hideous. However my kids love it a lot too. I own about 20 or so VR games on Steam and many of them are kid friendly. The other VR games I enjoy are Vanishing …

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Re: DOS path tracing CPU benchmark

Posted on 2017-05-06, 15:31

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by vladstamate

in Release Announcements

in Release Announcements

still float is not much use in the software from those days, could this not be done with fixed point math? You could. Definitely for things like multiplies and divides. However you will have to get a bit more creative with square roots (for various distance calculations) and pow (for light …

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Re: DOS path tracing CPU benchmark

Posted on 2017-05-06, 14:34

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by vladstamate

in Release Announcements

in Release Announcements

As any DOS benchmark must be ran on a 386 here are my results: 386DX 40Mhz (with 387): 4758 s. 486DX2 66Mhz : 361 s Yes it took a long time. I had time to make lunch and eat it too :) The raytracer that I wrote (in my signature) supports multiple algorithms, including bi-directional path tracing ( …

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Re: Unipcemu slow on Android?

Posted on 2017-05-05, 16:32

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by vladstamate

in PC Emulation

in PC Emulation

According to this (http://stackoverflow.com/questions/26662264/c … ath-android-ndk) the very last post mentions that the ACTUAL module was not in the /sources/ file and he had to move it there.

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