Re: Using debug.exe and experimenting with x86 instructions in DOSBox

Posted on 2020-02-14, 15:08

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by llm

in DOSBox General

in DOSBox General

A question: how does the CPU handle far calls in realmode? When e.g. an .exe file contains say "call far abdc:1234" does that mean the program will literally jump to that exact spot or is that what relocation items are for? every loading segment related data/code (jumps,call,offset,etc.) are …

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Re: Using debug.exe and experimenting with x86 instructions in DOSBox

Posted on 2020-02-14, 12:15

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by llm

in DOSBox General

in DOSBox General

Does the DOSBox debugger allow you to feed it a few instructions and execute them? no but as stated you can use a Visual Studio Debugger + simple x86 C/C++ Project for that (if VStudio is around) int main() { __asm { mov al, 2 mov dx,0xD007 add dx, al } return 0; } but maybe debug.exe fits already …

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Re: Using debug.exe and experimenting with x86 instructions in DOSBox

Posted on 2020-02-14, 05:14

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by llm

in DOSBox General

in DOSBox General

Looking for a way to quickly test the effect of x86 instructions 1. you can use visual studio with x86 inline assembler - works as long as segmented memory access or io ports access is not relevant to you, all 8/16/32bit opcodes still working 2. use Turbo/Borland C/C++ in Dosbox with Inline- …

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Re: dosbox-staging (DOSBox Git repo)

Posted on 2020-02-11, 10:48

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by llm

in DOSBox Patches

in DOSBox Patches

Nobody cares about ArcaOS support in dosbox-staging, so I consider this topic closed. i know - but still (because of with SDL2 + GCC 9.2 support) possible to build staging for this platform 😀

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Re: dosbox-staging (DOSBox Git repo)

Posted on 2020-02-10, 07:42

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by llm

in DOSBox Patches

in DOSBox Patches

btw: https://www.osnews.com/story/131305/gcc-9-2-c … os-ecomstation/, gcc 9.2 for OS/2

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Re: dosbox-staging (DOSBox Git repo)

Posted on 2020-02-10, 07:06

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by llm

in DOSBox Patches

in DOSBox Patches

Just before anyone else will jump in here and put the flames in discussion. Calm down, people we all very calm here :) Just few minutes ago me and krcroft had a friendly chat with Qbix about how to proceed and what kind of changes are acceptable upstream. great - are you able to give a brief …

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Re: dosbox-staging (DOSBox Git repo)

Posted on 2020-02-09, 19:21

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by llm

in DOSBox Patches

in DOSBox Patches

but it still seems that every extension dreamer and krcroft are talking about are more or less ignored by the main devs - or that is the feeling i get reading the responsens the main response seems to be: reject - if it reduces the amount of reachable platforms: Topics: SDL2, C++11, OS/2, Win95 …

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Re: Ways to dump memory to a file->

Posted on 2020-02-09, 18:58

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by llm

in DOSBox General

in DOSBox General

@Peter Swinkels reverse engineering is one of the stronges topics in software development - its very complicated and time consuming - you can spend month only on Alley Cats analysis (btw: someone does that already: https://github.com/gabonator/Work-in-progress/tree/master/DosGames/AlleyCat) 1. …

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Re: dosbox-staging (DOSBox Git repo)

Posted on 2019-12-10, 06:41

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by llm

in DOSBox Patches

in DOSBox Patches

Linux (make sure to install dependencies) Windows (follow instructions if Windows SmartScreen objects) the links are dead

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Re: dosbox-staging (DOSBox Git repo)

Posted on 2019-12-06, 08:27

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by llm

in DOSBox Patches

in DOSBox Patches

so no Problem with C+11 under OS/2 - even a little bit C++14 :) @the primary dosbox developers is there a list of used first class/second class operating systems that needs support and the used development environments for these? First class: - most downloads, user-feedback Linux? Windows (7,8,10) - …

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Re: dosbox-staging (DOSBox Git repo)

Posted on 2019-12-03, 14:15

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by llm

in DOSBox Patches

in DOSBox Patches

Concerning the link: What am I seeing there? A bot building a OS/2 library of SDL 2? yes, that is the official SDL build server: OS/2 is unsupported but still built on every commit

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Re: dosbox-staging (DOSBox Git repo)

Posted on 2019-12-03, 12:36

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by llm

in DOSBox Patches

in DOSBox Patches

according to the https://wiki.libsdl.org/Installation#IBM_OS.2F2_and_eComStation_and_ArcaOS Support was removed in SDL 2.0. SDL 1.2 still supports OS/2. Our buildbot still builds SDL2 for OS/2 on every commit, but it's just compiling the core source files; we don't have video, audio, etc backends …

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Re: dosbox-staging (DOSBox Git repo)

Posted on 2019-12-03, 08:57

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by llm

in DOSBox Patches

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under Linux/Windows under ArcaOS? which gcc Version? what is needed to replicate your build-environment? i've found a gcc 8.3 port: https://ecsoft2.org/netlabs-gcc https://os2ports.smedley.id.au/index.php?page=gcc-v8.x

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Re: dosbox-staging (DOSBox Git repo)

Posted on 2019-12-02, 16:20

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by llm

in DOSBox Patches

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@josch what is your exact build environment - anything that can be "easily" done on a CI system?

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Re: dosbox-staging (DOSBox Git repo)

Posted on 2019-11-28, 07:53

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by llm

in DOSBox Patches

in DOSBox Patches

the question regarding XGA_SetDualReg(...) and the missing cases (M_CGA2, M_CGA4, M_EGA, M_VGA, M_LIN4, M_TEXT, M_HERC_GFX, M_HERC_TEXT, M_CGA16, M_TANDY2, M_TANDY4, M_TANDY16, M_TANDY_TEXT, M_ERROR) is: -should there be an implementation? -is the enum just to big? -is it correct to do nothing or …

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Re: dosbox-staging (DOSBox Git repo)

Posted on 2019-11-28, 07:02

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by llm

in DOSBox Patches

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@dreamer And what about other patches in there? Some of them are small, trivial fixes, which should not be controversial in ANY way, like this one: https://github.com/dreamer/dosbox-staging/commit/2b357bd1fc9642767513a65ec287cb5ac51cc5ee this one is very controversal - before your change its unclear …

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Re: dosbox-staging (DOSBox Git repo)

Posted on 2019-11-27, 12:00

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by llm

in DOSBox Patches

in DOSBox Patches

and... please keep staging as near as possible to the svn dosbox at least for some time with back/forth patching - let staging gain traction and support by the main developers - or else it would become just another fork in the end currently there a many small changes like reformatting, renaming of …

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Re: dosbox-staging (DOSBox Git repo)

Posted on 2019-11-27, 07:50

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by llm

in DOSBox Patches

in DOSBox Patches

We would love to - clang-format is awesome, but we need to discuss and establish some formatting rules first, and it can't be out-of-touch with the code that's already there. Work started on wiki, feel free to contribute! great another thing: is there a coding guideline for member/variable …

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Re: dosbox-staging (DOSBox Git repo)

Posted on 2019-11-26, 16:26

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by llm

in DOSBox Patches

in DOSBox Patches

stuff for the future: -clang-format? -clang-tidy for c++11 modernization (if c++11 is a thing) -also building debug/heavy-debug variants?

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Re: dosbox-staging (DOSBox Git repo)

Posted on 2019-10-28, 09:18

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by llm

in DOSBox Patches

in DOSBox Patches

Are you currently building DOSBox using it? no, i never tried - i don't know if its even possible - i just want to give a hint to support multi platform releases like watcom does (watcom gets build on every change) (or scummvms huge release list: https://www.scummvm.org/downloads/)

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