Re: Winevdm
Posted on 2019-01-16, 01:49
win87em.dll is loaded and used for some things whether an fpu is available or not.
Re: Winevdm
Posted on 2018-11-21, 22:37
The Tandy VIS exclusive game "The Secrets of Hosea Freeman" runs too (in a window rather than fullscreen). There's a patched binary at archive.org that fixes the crashes from VIS exclusive features.
Re: Winevdm
Posted on 2018-11-18, 04:03
The Sierra installer "can" install games, but there are two problems 1: it cant create subfolders in "start/program" with a lot of error. 2: If the installer need 256 color mode the game cannot be installed. You can set the 256 color compatibility mode in properties just like any other program but …
Re: Winevdm
Posted on 2018-11-08, 02:26
There's a new release at https://github.com/otya128/winevdm/releases/tag/v0.6.0 with a ton of fixes.
Re: JMP to call gate?
Posted on 2018-10-01, 23:13
A jmp though a call gate cannot change privilege. Basically it's a useless functionality.
Re: Winevdm
Posted on 2018-08-27, 02:30
Jezzball works properly now and support for old resources was added too so this (with one patch of a real mode only instruction) silly thing can be done.
Re: x86 TSS fault cause?
Posted on 2018-08-08, 13:43
The fault type raised for each check is noted in the manual. BTW, the 80386 manual has an incorrect order and fault types for TSS checks that will cause some programs to break. The IA32 manual is correct.
Re: Win3mu Soon OpenSource
Posted on 2018-07-15, 17:38
He made a new release https://github.com/otya128/winevdm/releases/tag/v0.3.0 Jezzball now throws a few faults but after clicking them away it works.
Winevdm
Posted on 2018-07-06, 19:35
I've stumbled on this thing https://github.com/otya128/winevdm which combines wine's win16 dlls with mame's [23]86 emulation. I haven't tried it though.
Re: Win3mu Soon OpenSource
Posted on 2018-07-06, 12:52
It's 1982 era technology and was quite advanced for its time. :) We have to keep in mind that it shared the same 70s technology of the 8086 and that the 8-Bit 8080 was developed just recently before it. So comparing it to the 432 or i386 isn't fair, I think. The 286 was born out of desperation and …
Re: Win3mu Soon OpenSource
Posted on 2018-07-05, 19:54
The 286 may have been clumsy at times, but it was a very clean design also. IMO, the 286 was a mess. They tried to bring ideas from the iAPX432 project to the 8086 architecture to make them more accessible (every object has it own segment with specific privileges etc..) but without the more …
Re: Value of CS after jump/call to a call gate?
Posted on 2018-06-08, 18:14
It has to be the destination code segment. If it were the call gate any subsequent far calls would return to the call gate which would be bad.
Re: Value of CS after jump/call to a call gate?
Posted on 2018-06-08, 17:44
Calls though call gates to conforming segments don't change stacks so the DPL of SS (CPL) and RPL would be equal.
Re: x86 far return vs stack increment on immediate?
Posted on 2018-06-05, 17:26
Yes, I'd forgotten that the caller stack pointer is pushed before the parameters when passing though a call gate. Anyway, the callee esp is still thrown away after the return so handle it however you want.
Re: x86 far return vs stack increment on immediate?
Posted on 2018-06-05, 12:38
You only add the count to the return esp because the pre-return esp is thrown away. Look closer at the dosbox implementation, they add bytes to reg_esp and never use it.
Re: 80386 TLB lookups/stores?
Posted on 2018-05-14, 22:25
Afaik, those four bits are Present, Dirty, Read/Write and User/Supervisor(according to the 80386 documentation). But are they the direct values that are read from the PTE? Does it have a combination of the PDE/PTE in those bits? What when PDE.U!=PTE.U, and all those combinations? Same for R/W bits? …
Re: 80386 TLB lookups/stores?
Posted on 2018-05-13, 23:52
(e.g. read then write to same memory location resulting in two entries: first the read/(non-)dirty entry, then the second write/dirty entry). What? Why? There's no way the real cpu would work this way. With a 4way associative tlb you'd fill it quickly with redundant entries.
Re: 80386 TLB lookups/stores?
Posted on 2018-05-11, 19:28
I don't think you can trust any official documentation for the test registers. Not even bios code touches them. You'd have to find some real software that does something with them.
Re: x86 segmentation access rights accessed bit setting?
Posted on 2018-05-10, 18:46
It's set when the descriptor is loaded into a segment register.
Re: Compaq Deskpro 386 CPU emulation issues?
Posted on 2018-04-20, 12:53
Trying to use the FreeDOS EMM386.EXE from the Floppy disk version on the 80386 emulation seems to triple fault because of nested #PF faults at address 0x113630->0x113660->0x113630=triple fault? The final address being the triple faul itself instead of a page fault? This should only happen when …
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