Re: how to use DOS Int 21h + 4Bh for executing a sub program?

Posted on 2022-04-17, 04:34

by

by llm

in Marvin \ Software

in Marvin \ Software

the moment anything else touches that header your screwed (a packer, encryption, virus, anything that can mod the exe), you should always do it yourself than rely on magic in the header that is always manipulated by anything that wants to touch the header. What magic in the header, this is the …

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Re: how to use DOS Int 21h + 4Bh for executing a sub program?

Posted on 2022-04-16, 18:42

by

by llm

in Marvin \ Software

in Marvin \ Software

your com program that is doing the 4B needs to resize its memory with 4A, taking your stack into account. i don't need further dynamic memory allocation in this case, so i think it is ok that the called program claims all memory until its exited no, your exeload needs to resize itself to its …

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Re: how to use DOS Int 21h + 4Bh for executing a sub program?

Posted on 2022-04-16, 15:23

by

by llm

in Marvin \ Software

in Marvin \ Software

I remember MASM/LINK specifically has a command line argument to set the max allocation size to something else other than 0xFFFF. I also remember it's a command line argument, not a directive. But I totally forgot the name of the flag :( I always used later exemod since many linkers don't have this …

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Re: Sound Driver Pack

Posted on 2022-04-11, 05:45

by

by llm

in DOSBox Games/Apps

in DOSBox Games/Apps

your README.MD in the 7z file is not up to date 🙁

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Re: Wipeout sourcecode leaked

Posted on 2022-03-30, 05:12

by

by llm

in Milliways

in Milliways

Stiletto wrote on 2022-03-27, 20:46: Please note that it is currently unknown if these sources are fully buildable. seems to be buildable out of the box with some minor tweak in VS2019 see: https://news.ycombinator.com/item?id=30821818

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Re: DOSBox ReelMagic Fork

Posted on 2022-03-29, 10:28

by

by llm

in DOSBox Development

in DOSBox Development

the dosbox staging project forsters a dosbox SVN git: https://github.com/dosbox-staging/dosbox-staging/tree/svn/trunk this branch is the staging base line and always up to date with dosbox SVN -> its the merge base for staging even if Staging is not a thing to discuss here loudly, the Staging-SVN- …

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Re: how to use DOS Int 21h + 4Bh for executing a sub program?

Posted on 2022-03-27, 06:23

by

by llm

in Marvin \ Software

in Marvin \ Software

i've got latest EXEMOD.EXE 4.02 from Microsoft C 5.1 (DOS only) latest EXEHDR.EXE 3.20 from Visual C++ 1.52c (runs also under Win64) changed the max paragraphs to 0x21 for both - works thanks for the info

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Re: How to cure Rick Dangerous "Packed file is corrupt" error?

Posted on 2022-03-27, 05:58

by

by llm

in Marvin \ General Old Hardware

in Marvin \ General Old Hardware

there is also exepack from https://www.bamsoftware.com/software/exepack/ relativly new tool written in rust - can unpack dos stuff directly under windows/linux, very well mass tested

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Re: how to use DOS Int 21h + 4Bh for executing a sub program?

Posted on 2022-03-26, 18:36

by

by llm

in Marvin \ Software

in Marvin \ Software

i though exe program do not allocate the complete free ram like com programs - am im wrong - can find any references But only if the .exe does not request all the memory, and many linkers set it to request all the memory . See the value of the "Maximum allocation" in your .exe ( https://wiki.osdev. …

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how to use DOS Int 21h + 4Bh for executing a sub program?

Posted on 2022-03-26, 09:53

by

by llm

in Marvin \ Software

in Marvin \ Software

hello.exe that should get executed by exeload.exe hello.asm .model small .stack 200h dseg segment 'DATA' hello db 'hello',0dh,0ah,'$' dseg ends cseg segment 'CODE' assume cs:cseg start: mov ax,dseg mov ds,ax mov dx,offset hello mov ah,09h int 21h mov ax,4C00h int 21h cseg ends end start build with …

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Re: MASM and DEBUG in Dosbox

Posted on 2022-03-07, 07:10

by

by llm

in DOSBox Games/Apps

in DOSBox Games/Apps

and don't forget that you can using 64bit tools to cross assemble/compile without any problems under recent Win/Linux Systems most poeple tend to think that 16bit tools are needed for pure 16bit development - thats just not true recent UASM 32/64 bit linux/windows (a Port if Jwasm which itself is a …

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Re: 5.25 Floppy, Best Brands or Years? (Disks)

Posted on 2022-02-08, 12:50

by

by llm

in Marvin \ General Old Hardware

in Marvin \ General Old Hardware

The issue I'm running into is I need a decent stock of floppies (around 500) for a project what project (on earth) needs five hundred floppies??? more background please :) can't you use a hardware floppy emulator for your project? the SD cards can easily hold the content of 500 floppies like: …

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Re: How can I image an IBM 486SLC N51 hard drive? It has a 14.4 modem and 1.44mb floppy drive.

Posted on 2022-01-24, 09:40

by

by llm

in Marvin \ General Old Hardware

in Marvin \ General Old Hardware

its this one: https://thinkwiki.de/N51 - the N51SLC ? maybe there is some adaptor to connect your ESDI 80MB HD to a normal PC? i can't find one try ask: David Gesswein djg@pdp8online.com from https://www.pdp8online.com/mfm/ - he developed a MFM/RLL emulator - maybe he knows a backup solution for …

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Re: "No"UniVBE: Try to find test games or testers that want to helper me with this project

Posted on 2022-01-21, 14:03

by

by llm

in DOSBox Games/Apps

in DOSBox Games/Apps

Azarien wrote on 2022-01-16, 16:44: llm wrote on 2021-12-02, 06:46: first run installes the TSR, second run de-installes it Most TSRs used /u command line parameter for uninstallation. Most TSR got more features so there is a need for some command line parameter but you can add it if you can't live …

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Re: Japanese game, Ayumi-chan Monogatari Jissha-ban

Posted on 2022-01-11, 08:41

by

by llm

in DOS

in DOS

FM Towns is a different beast - i don't know how good the support of that is in Dosbox - maybe try Dosbox-X - but it could be also that MAME or something is needed and please be more concret: "I can't get this game to work" is not very helpfull

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Searching for games that use UNIVBE.DRV for SVGA

Posted on 2021-12-31, 06:48

by

by llm

in Marvin \ Software

in Marvin \ Software

i've got a small TSR that inhihibts internal linked UniVBE 5.3x driver to be loaded by games https://github.com/LowLevelMahn/NoUniVBE i want to extend that to other relevant UNIVBE.DRV versions anyone around with a huge game collection who is is able to search for UNIVBE.DRV files to give me an …

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Re: How does Sierra's EGA640.DRV even work?

Posted on 2021-12-23, 11:26

by

by llm

in DOS

in DOS

Peter Swinkels wrote on 2021-12-23, 10:14: Only two? How did you conclude that? there are only 2 different hashes for all the files - first column

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Re: How does Sierra's EGA640.DRV even work?

Posted on 2021-12-23, 09:53

by

by llm

in DOS

in DOS

so there at least only 2 version in all your found drivers hash: 5ffbf897ebe1879434e7008b8f8575e8 D:\Other\g\ecoq1tlk\TSN\EGA640.DRV 1-9-1992 13:57:50 D:\Other\g\FrddyPhrk\INN\EGA640.DRV 17-6-2002 00:09:52 D:\Other\g\kq7\INN\EGA640.DRV 1-9-1992 18:57:50 D:\Other\g\Kqcd1\INN\EGA640.DRV 1-9-1992 12: …

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Re: How does Sierra's EGA640.DRV even work?

Posted on 2021-12-23, 09:23

by

by llm

in DOS

in DOS

Peter Swinkels wrote on 2021-12-23, 09:15: @ilm: LLM not ilm 😀 can you post MD5 keys of the files: https://www.nirsoft.net/utils/hash_my_files.html (small util on command line or ui, no installation)

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Re: How does Sierra's EGA640.DRV even work?

Posted on 2021-12-23, 07:18

by

by llm

in DOS

in DOS

(IDA Freeware 5 should give the same result): Just a hint: IDA Freeware 5 is obsolete. Currently, IDA Freeware is at 7.6, see https://hex-rays.com/ida-free/#download . For reverse-engineering 16-bit DOS stuff, IDA 5 should be good enough, or possibly even better, though. i've got a full version IDA …

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