Questions tagged [emulation]

Processes and software for emulating retro hardware (e.g. MAME, QEMU). **Read tag wiki for guidance. Not every emulation question is on-topic.**

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1answer
40 views

What causes sprites to lag behind a scrolling map in first-generation Pokémon games?

This is something I often notice whenever I see a first-generation Pokémon game being played on a GameBoy emulator. It might be present on real hardware as well, but I don’t have that to test. When ...
2
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1answer
267 views

What is the file that VICE refers to as dos1541?

VICE needs a file called dos1541 if you want hardware emulation of the 1541 disk drive. What does that file contain, exactly? The 1541 seems to have two ROMs: a DOS and a KERNAL. But if I take the ...
9
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2answers
672 views

When does an IBM-compatible PC keyboard controller dequeue scancodes?

There is a not-unheard-of technique in DOS software to detect certain keypresses (like Ctrl+Break) by intercepting the keyboard interrupt (IRQ 1) and reading the scancode directly from the keyboard ...
2
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1answer
128 views

Basilisk II how mount unix filesystem

I use Linux Bassilisk II I setup unix path but how I can read file from it? It not appear in my desktop My system is in .sit file, how I can read file?
18
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1answer
784 views

Unable to install Colonization in DOSBox

I'm attempting to install Sid Meyer's Colonization in DOSBox from the original floppies, and it gives me the error message "You have specified a drive that doesn't physically exist!" when I ...
15
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2answers
1k views

Emulate a text-mode DOS program using a Unix terminal

Is it possible to run a text-mode DOS program in an emulator under a Unix-like operating system (Linux/*BSD/macOS) such that DOS text-mode input and output is done on a Unix terminal instead of a ...
2
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2answers
2k views

How does the Everdrive handle all the special chips and stuff that were put in cartridges?

An "Everdrive" is like a cartridge that looks just like a NES/SNES/N64/whatever cartridge, and is put into a real, original console. So you need the original hardware for it to work. And ...
4
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3answers
687 views

How is it possible that this “Polymega™” console will “not support” Everdrives?

I'm reading here: https://polymega.com/faq/ WILL EVERDRIVES, GAME GENIES AND MULTI-GAME CARTS WORK WITH POLYMEGA™? Polymega™ does not support Game Genies or Everdrives. How is that possible? What's ...
2
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0answers
83 views

Running Codenet on a Commodore 64 Emulator

I finally managed to get basic networking stuff working on VICE, thanks to another thread on Retrocomputing. I'm now wondering how to setup a Codenet server emulation. I was able to identify four ...
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40 views

How to Perform RR-Net MK3 Detection on VICE Commodore 64 Emulator?

RR-Net documentation describes a detection algorithm for the MK3 model. The algorithm is supposed to reveal the last four hex digits of the MAC address. According to documentation the MAC address 28:...
7
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1answer
113 views

Compucolor 2 emulator CCEmu's `.ccvf` disk format

This Compucolor 2 emulator uses disk images with the file extension .ccvf. Here is an example file. I would like to understand how to interpret that format. I understand from the documentation that ...
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5answers
4k views

Why are different emulators needed to run platforms that use 6502 assembly code?

To my knowledge, an emulator turns machine code for a console into something that your computer can understand. For example, assembly code from a Gamecube game is not the same as from a .exe file. ...
27
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4answers
11k views

What exactly is a cycle-accurate emulator?

Emulators such as Higan are cycle-accurate and thus have full compatibility with all existing software. In a 2011 Ars Technica article, much was said about cycle accuracy and how it preserves games by ...
3
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2answers
784 views

How can I get MAME to run modified ROMs whose checksums don't match the originals?

In the aftermath of the question about running the arcade Pac-Man ROM on a Sinclair ZX Spectrum I discovered that about the same time that was done, somebody else did the reverse, porting a classic ...
8
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3answers
987 views

How to transfer files to C64 emulator quickly

I just discovered the fun of writing small programs (Basic/asm) for an emulated C64 for me. Unfortunately, I cannot get used to the emulated C64 keybord, and would like to write the programs on the ...
23
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2answers
5k views

How to convert Amiga DMS to ADF?

Our demoscene group managed to release only one demo before it fell apart, but these being the early days of the Internet in my country, and me getting lucky with obtaining access to it and creating ...
8
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2answers
1k views

Build a hardware clone or emulator of Apple II?

These days we are constantly seeing low-cost boards that have huge power (raspberry pi, various arduino-like microcontrollers.) I am hoping I could make, or get, a clone or emulation of an Apple II ...
4
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3answers
220 views

Running WarpCopy64 on an emulator

I'm interested in IP networking capabilities of the Commodore 64. I learned there is a tool called WarpCopy64 that can be used to run a simple file server on the Commodore. The server can be accessed ...
39
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1answer
6k views

Fixing obscure 8080 emulator bug?

I'm using cpudiag.bin from http://www.emulator101.com/files/cpudiag.bin to test my emulator. I've already implemented the CP/M CALL function at 0x05, offset the program at 0x100 and fixed the offset ...
8
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5answers
481 views

Getting Music Functioning for Raptor: Call of the Shadows (1994)

I can't get the music audio working for the 1994 version of Raptor. Does anyone know how I can remedy this? I'm not sure if this is the correct forum for this question, but here goes. I have an ...
10
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1answer
269 views

Understanding the DMK disk image file format used by TRS-80 emulators

DMK is a low-level disk image file format used by TRS-80 Model I & Model III, Tandy Color Computer, Dragon 32 & 64, and MSX emulators. It's capable of representing copy-protected disks and all ...
20
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3answers
5k views

How to detect a real Commodore 64, THEC64, or VICE emulator in software?

Some programs notice if they are run on a real Commodore 64 or an emulator. For example, this demo from 2007 stops on VICE emulator 3.2 with the message "No VIC inside". How is this done? I ...
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5answers
575 views

Are there any good resources on emulating/simulating early computing input/output?

Note: I hope this question is on topic. I'm not sure where else to put it. There are several tutorials available online for writing emulators/simulators. Unfortunately they all seem to focus on ...
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2answers
446 views

How do I slow down the emulation in VMware and make it go “proper fullscreen” for Windows 3.11?

I have just managed to find and install my native language versions of MS-DOS 6 and Windows 3.11 in a virtual machine, just as I had on my first computer: an IBM 486 DX2 66 MHz. VM software: VMware ...
8
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1answer
274 views

ZX Spectrum fuse-emulator - how to use loader/multi-file program?

I'm using fuse-emulator on Ubuntu. In a book of type-in programs, some are spread across multiple files. There is a "loader" (usually setting up graphics or some machine code parts) which ...
20
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2answers
2k views

How to check the C64 graphics mode used by Maniac Mansion

I have been investigating the MS-DOS port of the C64's Maniac Mansion game. The original MS-DOS port used the C64-specific character map to draw the various backgrounds in the game. I noticed that ...
3
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1answer
180 views

PC Task performance

What sort of performance I can expect from PC Task 4.4 on Amiga 500 + 030 50MHz MMU, 64MB RAM? Would it be possible to run Windows 3.11 / 95 and have any real use from it?
4
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3answers
996 views

How was it possible to run IBM mainframe software in emulation on HP?

... At least, without getting sued into the ground? According to one of the answers to What was the most critical supporting software for COBOL on IBM mainframes? We installed a new HP replacing an ...
5
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1answer
166 views

Menu in Octapolis

I have been retrogaming with Octapolis on an emulated Commodore 64. Starting up the game presents a menu offering a choice between one or two players, and between music and sound effects. But I don't ...
8
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1answer
934 views

Is there a seamless, Wine-like AmigaOS emulator for Linux, specifically for text-based programs?

After trying out FS-UAE on my Fedora Linux system, which worked quite nicely, I got to thinking. Even though when the Amiga was originally released in the middle 1980s, it was revolutionary in its ...
0
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1answer
104 views

VICE loads files slowly on Fedora 32 Linux [closed]

I lately wanted to try some of the Commodore 64 games I have kept as D64 files on my Fedora Linux system using VICE. I have lately upgraded the system from Fedora 26 to Fedora 32. After I started up ...
8
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1answer
7k views

Symbian emulator to run Ngage games

I don't really know if this is the correct place to ask this, if not let me know where I should. I would like to know if it would be possible to run Ngage games on an existing Symbian emulator. There ...
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1answer
239 views

Is the Raspberry Pi Model B (2014) technically inferior to an original Xbox (2001) in compute power/specifically for emulators? [closed]

(I first asked this in the Raspberry Pi section, but it received no responses. I think this, Retrocomputing, might be a better fit.) I the year 2003, I had my Xbox chipped in order to be able to run ...
2
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1answer
232 views

How likely is it that a ROM could be “corrupted” resulting in visual artifacts during gameplay? [closed]

I watch a lot of retro game streams. Frequently, whether they are running on a software emulator, hardware emulator (Retron 5 or whatever), or an Everdrive, whenever there is some weird glitch in the ...
2
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0answers
193 views

Does RetroArch have a PAL filter like the NTSC one?

RetroArch the emulator "wrapper" has an option to enable an NTSC filter over the image, simulating the visual look of a composite NTSC signal/TV. Here is a comparison between the "raw&...
-1
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1answer
328 views

Why are there no actual complete and 100% verified/vetted ROM collections still? [closed]

Recently, I've been searching far and wide to collect, in digital form, the exact games that I owned as a child, or had temporarily, or rented/borrowed/played at somebody else's house, or never really ...
13
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7answers
2k views

Do any mainframe emulators exist with a functional FORTRAN compiler?

Similar to this question, but generalized to any mainframe computer from before the microprocessor era, does there exist an emulator and OS for a vintage mainframe computer that will run the output ...
9
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3answers
879 views

How to do I/O with emulation code?

I have a partly-written emulation program for the 8086 CPU. And I'm not sure how to go about adding I/O capabilities to it. The emulator implements a subset of the 8086 instruction set described here. ...
8
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2answers
1k views

Why exactly does MAME (apparently) require different ROMs for different versions of MAME?

I've never heard of any emulator which requires different ROMs based on which version the emulator is. I thought that ROMs were fixed files that were dumped from hardware cartridges or PCBs, and then ...
6
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1answer
259 views

Reconstructing uncompressed program from compressed tape image

I have a C64 program in a .t64 file. If I load it into an emulator, what I see is that it loads into a cracktro, which then proceeds to uncompress (taking several seconds at 100% speed) the original ...
3
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2answers
515 views

Every single ROM in my collection has the wrong SHA1 hash according to No-Intros

I have a collection of ROM files for the NES, SNES, Nintendo 64 and others. These ROMs match exactly those games that I own or owned growing up. Recently, I found out about the "No-Intros" ...
1
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0answers
82 views

Is there something like “libretro-thumbnails” but with high-resolution, good scans of classic video game box art? [closed]

https://github.com/libretro-thumbnails/libretro-thumbnails This contains cover art for "most" games. Sadly, they are very low-res, often have bad contrast/color, and are frequently ugly/...
27
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6answers
5k views

Is there still no “digital version of PCBs and ICs” software that all future emulators can use?

It strikes me that, in theory, it would be possible to skip the classic approach of emulation and instead literally build a NES, SNES, Nintendo 64 or any console with digital "components", ...
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1answer
567 views

What's the deal with “higan”? [closed]

https://byuu.org/higan/ https://byuu.org/bsnes/ The domain is called "byuu.org". The emulator is said to be called "higan" or "bsnes". The download link for "higan&...
4
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2answers
582 views

Why does the “Mesen-S” SNES emulator require a separate DSP ROM for Super Mario Kart, but *not* for Stunt Race FX?

If I start vanilla "Mesen-S" and load in Super Mario Kart, it says: This game requires a firmware file for the DSP1B chip. If I feed the emulator that "DSP ROM" file, it then ...
-1
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2answers
235 views

What does “cycle-accurate emulation” mean? [duplicate]

Note: I've attempted to ask this question several times in the "Arqade" category. Just like with the "History" category, anything I ask there is deleted by their broken bots soon ...
3
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1answer
253 views

Does anyone have information about the nj32disk.sys driver?

I'm currently trying to use the nj32disk.sys driver to use my USB stick as a virtual hard drive. The problem is that the driver acts like a floppy disk. My question is: Is there a documentation about ...
1
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0answers
120 views

Do the Tandy CoCo and the Dragon 32 & 64 use all the same disk image file formats?

Tandy's TRS-80 Color Computer "CoCo" and the Dragon 32 & 64 were very similar but not clones and not the same. Floppy disk versions used totally different DOSes and disk layouts. Both ...
4
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0answers
326 views

What is it with DS emulation being so slow?

I have a fairly decent computer, and I have been messing around with DS Emulation recently. I have found that if a game is running on the emulator, and if I have anything else running, the performance ...
3
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1answer
149 views

`DRAW` instruction timing

I asked a question here about CHIP-8 instruction timing, and this answer mentions that DRAW waits for vblank: For Chip-8 code that draws anything, the limiting factor will be the wait-for-vblank that ...