Re: Windows 3.0/EMM386.SYS strange subroutine when booting (Windows in standard mode)?

Posted on 2017-12-23, 19:03

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by superfury

in PC Emulation

in PC Emulation

After some debugging, I notice that the special error code of -2(used with plain INT/INTO/INT3 instructions) gets pushed on stack, causing the Virtual 8086 monitor to detect it as a valid fault. Disabling the push on the stack causes it to continue on to the next driver:D Now the VIDE-CDD.SYS …

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Re: Windows 3.0/EMM386.SYS strange subroutine when booting (Windows in standard mode)?

Posted on 2017-12-23, 12:51

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by superfury

in PC Emulation

in PC Emulation

After some little adjustments on loading NULL DS/ES/FS/GS descriptors(allowing for the clearing of DS-GS switching from Virtual 8086 mode to Privilege Level 0 monitor) and fixing the wrong offsets of the SS(0)/ESP(0) to be correct when firing interrupts(wrong base offsets and Privilege level shifts …

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Re: Windows 3.0 strange subroutine when booting in standard mode?

Posted on 2017-12-22, 09:52

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by superfury

in PC Emulation

in PC Emulation

Just looked at the SS descriptor that it's switched to: it has a limit of 0x17F, while being a normal data segment(0x92 attribute)? Thus it'll fail on the first PUSH, which decreases SP from 0 to 0xFFFF and tries to write there. Why is the ESP register set up to become 0 on PL0? Why not 0x180? Or is …

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Re: Windows 3.0 strange subroutine when booting in standard mode?

Posted on 2017-12-22, 00:33

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by superfury

in PC Emulation

in PC Emulation

The problem now is the following: The INT 21h causes a #GP because it isn't present. That #GP IDT entry is found, but it's DPL is 0, while CPL is 3. Since DPL triple fault(Remember, it's already a #GP fault handler running, so another stack fault causes a Double Fault, which triple faults due to not …

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Re: Windows 3.0 strange subroutine when booting in standard mode?

Posted on 2017-12-21, 22:41

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by superfury

in PC Emulation

in PC Emulation

The INT 21h call from V86 mode causes a #NP due to the descriptor's present bit being 0(entire descriptor is filled with zeroes). That causes another fault due to it not existing, thus double faulting. Then the double fault handler doesn't exist, thus triple faulting, rebooting the system? Is that …

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Re: Windows 3.0 strange subroutine when booting in standard mode?

Posted on 2017-12-21, 14:29

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by superfury

in PC Emulation

in PC Emulation

Just modified EMM386.SYS to use the parameter ON in CONFIG.SYS to force it on. Now, when it executes a normal protected-mode IRET eventually(probably to restore MS-DOS in Virtual 8086 mode or a task switch), it will load CS with a NULL descriptor? Three words are POPped off the stack: Flags(0x2AA), …

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Windows 3.0/EMM386.SYS/EXE(MS-DOS 6.22) issues when booting (Windows in standard mode)?

Posted on 2017-12-21, 10:17

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by superfury

in PC Emulation

in PC Emulation

When I try to run Windows 3.0 in Standard Mode on UniPCemu's 80386 emulation, I see it do something strange(it's an endless loop with invalid return point, seeing as the call instruction keeps retriggering infinitely until stack will overflow) at 51:FE1 in plain protected mode. It keeps returning to …

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Re: Suddenly can't edit posts anymore?

Posted on 2017-12-20, 19:05

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by superfury

in Milliways

in Milliways

One big thing that's changed with this limit is actually a really simple one: changing a topic's title, which requires you to 'edit' the first post to even do. I regularly update the topic title of my topics to reflect the current state being talked about in the latest posts(as opposed to the …

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Re: MSCDEX.EXE+VIDE-CDD.SYS in UniPCemu having problems detecting disk changes?

Posted on 2017-12-20, 18:59

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by superfury

in PC Emulation

in PC Emulation

After messing a bit with the processing of the Sense Packets(being incorrectly filled and put in the error register(Sense code being invalid, as well as writing the contents to the wrong register)) and related code bugs, I've managed to make it see the disk changes correctly now(using the 10 second …

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Re: MSCDEX.EXE+VIDE-CDD.SYS in UniPCemu having problems detecting disk changes?

Posted on 2017-12-20, 08:51

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by superfury

in PC Emulation

in PC Emulation

Just implemented missing disk change support(Some eject refusal support as well as a missing mandatory command: MECHANISM STATUS command reporting disk change and insertion status, prevent/allow medium removal command having seperate flags from the normal locking used by the Microsoft feature(using …

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Re: 80386 emulation vs Megarace cutscenes?

Posted on 2017-12-17, 00:09

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by superfury

in PC Emulation

in PC Emulation

One thing I noticed with Megarace as well: having installed less than 2MB RAM(requirement of the game) also makes the cutscenes fail, but continue on to the main menu/game itself? Shouldn't it terminate with an out-of-memory error? (1MB tested, which happens switching between 80(1)8X processors and …

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Re: Suddenly can't edit posts anymore?

Posted on 2017-12-16, 16:21

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by superfury

in Milliways

in Milliways

Just added a new thread. The edit button(and delete button) show up correctly. My slightly older threads/posts from 1-2 days ago are still locked? How long can posts be edited now? Edit: The same applies to this post. Editing works atm.

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MSCDEX.EXE+VIDE-CDD.SYS in UniPCemu having delays detecting disk changes?

Posted on 2017-12-16, 16:20

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by superfury

in PC Emulation

in PC Emulation

I've implemented the Media Status Notification Support Specification, Version 1.03 documentation by Microsoft into UniPCemu, but for some odd reason, the CD-ROM driver(MSCDEX.EXE from MS-DOS 6.22/VIDE-CDD.SYS combo on MS-DOS 5.0a) fails to see the disk has actually changed? If I insert a different …

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Re: Suddenly can't edit posts anymore?

Posted on 2017-12-15, 23:44

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by superfury

in Milliways

in Milliways

Disallowing free email domains (especially receive-only throwaways) should help. THAT should have been, I dont know.... ALWAYS? Since those are especially odd to use: imagine losing your password and needing to use password recovery. But there's no mail to contact from registration(temp. email …

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Re: Suddenly can't edit posts anymore?

Posted on 2017-12-15, 23:40

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by superfury

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Whoops, Btw=>But. Another example of my frequent editing... Aaargh..... 😖

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Re: Suddenly can't edit posts anymore?

Posted on 2017-12-15, 23:38

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by superfury

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It's getting pretty annoying posting something, seeing a typo which I can't edit(or be bothered to go all the way contacting a mod for a simple three-letter word(Btw at the start of my last post), since it sounds kind of ridiculous to start with(Phone OSKs and typos, impossible to fix XD )).... Hope …

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Re: Suddenly can't edit posts anymore?

Posted on 2017-12-15, 23:32

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by superfury

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But even so, 2-factor authentication prevents other people from using your account, not you from creating another account. Also, afaik 2-factor authentication doesn't limit count in any way, so the problem with multiple accounts will still persist. Although I do agree that it's good to have, to …

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Re: Suddenly can't edit posts anymore?

Posted on 2017-12-15, 22:13

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by superfury

in Milliways

in Milliways

Of course, the whole manual editing/deleting of such cookies is a security risk as well, which should be protected against server-side. But imagine this: when someone is logged in and gets banned(or blocked etc.) all he/she has to do to create a new account to use is simply delete their cookies. …

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Re: Suddenly can't edit posts anymore?

Posted on 2017-12-15, 22:03

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by superfury

in Milliways

in Milliways

Afaik the whole reason cookies are used for storing login links(e.g. something like a session id and possibly other data to compliment/secure the session id) is to fix the whole problem of multiple computers/accounts/browsers and enable(until manually/automatically deleted) identification of such …

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Re: Suddenly can't edit posts anymore?

Posted on 2017-12-15, 21:57

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by superfury

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Well, the problem is in the combination of those: The only thing the php server(or any website hosting server in general) has is the computer's public IP address. So that can be the modem/router that's connected to the provider. Everything past that(individual computers connected with an internal IP …

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