Questions tagged [emulation]
For questions about processes and software for emulating retro computer and console hardware (e.g. MAME, QEMU).
87
questions
1
vote
2answers
169 views
How to get rid of keyboard latency in atari800 emulator?
I use the atari800 emulator v. 4.2.0 on windows 10 and linux in latest version.
(https://atari800.github.io)
I notice an annoying keyboard latency of up to 100-200ms (keypress-to-click and ...
14
votes
2answers
749 views
Does the Z80 allow interrupts after processing and ignoring a 0xdd prefix?
I read here that if the Z80 encounters e.g. multiple 0xdd prefixes in sequence, for each 0xxdd except the last it acts almost like a NOP, but does not allow interrupts to occur immediately after "...
8
votes
1answer
2k views
NES chips usage
I am curently studying NES architecture to create a NES emulator. While looking up the NES motherboard schematics (https://console5.com/wiki/Nintendo_NES-001), some of the chips usage are not clear to ...
12
votes
2answers
628 views
Where to upload the odd and rare emulators and related to them ROMs & software?
Over time, I collected some rare and interesting emulators and their roms and software for, for example, region specific computer machines, rare 1-2 gen consoles and what not. Many of these emulators ...
7
votes
2answers
376 views
Get exact position of raster beam on C64/C128
By reading register $D012/$D011 or when pausing the execution of an emulation in VICE starting the monitor and entering io d000, it is possible to get information about the current rasterline. For ...
2
votes
2answers
227 views
Is there such thing as para-emulation? [closed]
Is there such thing as a para-emulation? Like para-virtualization but for emulation? If so, where could I find a website that describes it?
17
votes
4answers
2k views
80286 real mode emulator for 8086
While trying to use a "modern" sound card (an Aztech Sound Galaxy Pro 16 II) in an XT compatible 8086 computer, I encountered the problem that the drivers and tools (like the mixer initialization tool ...
25
votes
2answers
7k views
How does the Gameboy Link Cable work?
I've been looking into implementing Gameboy Link Cable compatibility into Bizhawk (which does not support it yet) using Lua. The problem is that I can't find any mention of how it works online.
I ...
13
votes
1answer
849 views
Does the Commodore CDTV-CR contain a 65C02 for some reason?
Browsing around the FS-UAE source code I discovered a 65(S)C02 emulation core, which appears to not be referenced anywhere outside of some CDTV-CR related source file.
Apparently, a CDTV is ...
2
votes
2answers
335 views
emulator library that allows to partially emulate old games [closed]
EDIT: previously I added a lot of examples to this questions. I removed the examples, because the question was voted to be "too broad", so I put more emphasis on the question again.
Question:
Is ...
5
votes
3answers
404 views
Can someone explain this algorithm used to compute the auxiliary carry flag?
I'm debugging my 8080 emulator and I've gone the route of comparing it to the output of another tested emulator to see where I went wrong. When calculating the auxiliary carry flag, I used this ...
8
votes
4answers
962 views
C64 cartridge emulation with ATmega
As a personal project I had the idea to create a custom cartridge for my Commodore 64 and use an ATmega 1284p microcontroller to emulate eproms and/or custom chips.
Basically my idea is similar to ...
59
votes
10answers
7k views
What makes accurate emulation of old systems a difficult task?
Thanks to a lot of passionate and skilled people, we can emulate pretty much any retro platform today.
For most people they perform well enough, but in fact, a substantial amount of these emulators ...
33
votes
1answer
2k views
Did Windows NT 4 emulate x86 on non-Intel platforms?
I've been trying to find more information about non-Intel versions of Windows NT regarding x86 emulation but found very little about it. There is one sentence about it in the Wikipedia page but the ...
-4
votes
4answers
468 views
Operating systems which have non-x86 instruction set architecture [closed]
What are the most famous operating systems for non-x86 computers? I mean, most famous OS which have different instruction set architecture.
Background (to better understand my task):
I ask this ...
1
vote
1answer
709 views
How to add Final Cartridge III to VICE C64/128 Emulator
How do I properly add Final Cartridge III to VICE Emulator?
In the file menu, VICE has an item Attach cartridge image... which splits up into CRT Image but also a list of several cartridges, among ...
12
votes
1answer
323 views
Could suitably-written Apple-I software force bytes into the display shift register, and do modern recreations emulate that?
The original Apple I didn't use RAM to hold the contents of the display, but instead used a group of six 1024-bit shift registers to hold the display contents and a seventh 1024-bit shift register to ...
6
votes
7answers
1k views
What systems had the lowest resolution ever that still allowed games to be made?
Just for fun, I wrote my own Chip8 interpreter/emulator and it works.
The point is that it works in the terminal, meaning that a pixel is rendered using curses and a # character.
For the Chip8 that'...
14
votes
3answers
615 views
Is there a line printer sound simulator?
To improve "authenticity" of a mainframe simulator and for an additional nostalgic effect, I'd like to add sounds of a line printer to it. They should be similar enough to the original sounds for ...
7
votes
1answer
2k 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 ...
3
votes
1answer
2k views
Emulating IRIX on a modern system [closed]
Has there been any attempt to emulate a system that could run the IRIX operating system?
48
votes
17answers
10k views
Simplest system to create an emulator for
Next year I'm going to teach a 2-semester microprocessors class to third-year undergraduate EE students. In order to sign up for the class, students need to have completed programming and digital ...
21
votes
6answers
4k views
How do arcade ROMs work
The way I understand it, ROMS are like virtual games, and emulators are like virtual game consoles, or handhelds. What I don't understand is how there are ROMs for arcade games, which don't have ...
38
votes
5answers
5k views
Is it possible to make a ROM converter?
Based on my understanding, an emulator is necessary because the machine with the emulator on it (say Windows), doesn't execute the same machine code as the target platform (6502, for example). So what ...
16
votes
5answers
3k 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.
...
11
votes
4answers
3k views
Is there a cycle-exact 8086 emulator?
I'm trying to emulate programs from the 80s, but with an accurate clock-speed¹ (pretending its an 8086). Meaning that if a 8086 would take X ms/opcode, the emulator should take X ms (+- a bit of ...
6
votes
4answers
865 views
Retro emulation with perfect V-sync
I'm building an retro emulator to connect to a PAL (720x576i @ 50 Hz) CRT TV, and would like a perfect V-blank image, so the visuals are identical to original arcades and retro computers.
In other ...
5
votes
2answers
690 views
Open source, non-GPL SID emulator
I am looking for a SID emulator that is open source, but not GPL. In particular, I am looking for something with a license that allows me to link it to a closed-source program; and also one that ...
23
votes
2answers
2k views
Are there runnable Multics systems available?
I've always read that Multics was a failed precurser of Unix, and was interested in seeing how it looks (as in, what features did Unix remove that Multics had, and did more modern Unixen bring them ...
7
votes
3answers
639 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.
...
2
votes
2answers
418 views
Is emulation ultimately the future of retro computing? [closed]
As you probably know, nothing really lasts forever in the human-made world of appliances, especially electronic ones.
Whether it stems from market evolution, technical advancements, newer paradigms, ...
3
votes
1answer
830 views
Is it possible to make VICE load .prg files faster?
When I load a C64 .prg with the Hoxs64 emulator, my .prg loads pretty much instantly.
But when I load the same .prg file with VICE (x64 app.prg) it takes quite a while (depends on memory map, but ...
10
votes
3answers
1k views
Intel 8080 - Behaviour of the carry bit when comparing a value with 0
I'm in the process of writing an emulator for the Intel 8080.
The description of the CMP instruction from Intel's 8080 programming manual (see page 20) says the following:
The specified byte is ...
6
votes
1answer
260 views
Can't type angle bracket characters in AmigaOS 4.1 on WinUAE
Has anyone else experienced that when running AmigaOS 4.1 inside WinUAE that they can't type the < or > characters? I have a mostly bog-standard American QWERTY keyboard, no special emulation ...
5
votes
2answers
584 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 ...
10
votes
5answers
3k views
USB floppy drive emulator, is there such a thing? and if so, where can I get one
I'm aware of the floppy emulators that are installed to 3.5" bays where "disks" are stored on a flash drive. But what I need now is the opposite - essentially a USB dongle that emulates the floppy ...
20
votes
1answer
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 ...
8
votes
1answer
639 views
How was the Traf-O-Data 8008 simulator developed?
Traf-O-Data was the first business partnership between Paul Allen, Bill Gates and Paul Gilbert. In order to develop the software for their custom-built Traf-O-Data machine (Intel 8008 Inside™), ...
6
votes
1answer
885 views
How was the Microsoft PDP-10 8080 emulator developed? [closed]
Altair BASIC, the first version of Microsoft BASIC, was developed using an Intel 8008 emulator, modified to emulate an Intel 8080, running on a PDP-10 computer. This emulator was originally designed ...
9
votes
2answers
487 views
How to obtain CPU and other hardware specs for emulator development
In order to write emulators for older systems, one has to know the "inner workings" of the original hardware and understand what makes it "tick". I've noticed that with some systems, proprietary ...
8
votes
3answers
949 views
How to develop software for the Commodore 64 with VICE?
I see a very large fan-base and hear a lot (especially here on retrocomputing) about how great the Commodore 64 was. Growing up in the Windows 95/98 era, I seemed to have missed a great era for ...
10
votes
8answers
1k views
Emulators running on 8-bit personal computers
Were there emulators running on 8-bit computers (preferably "mainstream" personal ones), available to general public (as opposed to in-house developers only)? I am mostly after emulators running fully ...
18
votes
4answers
2k views
Emulate smooth scrolling
One thing I really liked about the 8-bit (and even most 16-bit) games was that the frame rate was fixed to the vertical blanking. Games were smooth back then. I've been trying to recreate that feeling ...
6
votes
1answer
462 views
Can someone help me get xROAR to read files? (M6809/TRS-80 ColorComputer)
I implemented a Forth interpreter or the TRS-80 Color Computer (M6809) way back in the 1980s, and I've been trying to figure out how to get it loaded into an emulator to test some parts of the ...
8
votes
2answers
468 views
Do any Atari 8-bit emulators produce the disk / tape I/O sound?
I asked this question several months ago about why did the Atari produce beeping sounds when loading a disk or tape and it seems that it was by design. However, as I've played with a few emulators ...
11
votes
6answers
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 ...
6
votes
1answer
332 views
What are all the known file extensions for Atari 8-bit disk/tape/cartridge images?
I have a few collections of Atari 8-bit images that I've downloaded over the years, but only cherry picked into them. I'm at the point that I'd like to clean things up a bit and get rid of files that ...
16
votes
2answers
1k views
How old-computer emulators work?
I'm wondering how old-computer emulators work.
I can think of two possible approaches:
"hardware" approach - like a set of components that exactly act as low-level hardware elements. I mean a bus ...
3
votes
1answer
221 views
Trying to open IBM FILING ASSISTANT in DOSBOX, or other? [duplicate]
How does one get a program like a word doc onto MS DOS to begin with? I have a set of files that are backups, only one with .exe that is from an ancient word processor and would eventually like to ...
6
votes
1answer
422 views
pop af and flags
I'm writing a Z80 emulator in Swift for Mac OS and I have got as far as implementing the 16 bit pop instruction. The documentation I have found (i.e. The Z80 CPU User manual UM008011-0816 and also ...
