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v1.2.1 Try it in your web browser: clownmdemu.clownacy.com Download: Standalone, libretro Just a small update to fix a crash that would happen when minimising the Tiles debugger, and also to improve the accuracy of 68000 exceptions. The latter fixes VS Puyo Puyo Sun (patched) crashing after its...

...least, I thought it was, until I looked at what my emulator was actually doing: else if (address >= 0x4000 && address <= 0x4003) { /* YM2612 */ /* TODO: Model 1 Mega Drives only do this for 0x4000. Accessing other ports will return the old status, and...

...would not, producing values that are off by 1. As a result, the code for this is less sightly than I would like it to be: #if 1 /* This goofy thing implements a fixed-point multiplication using only shifts and an addition. Unfortunately, this particular method is required in order...

I've finally added support for the YM2612's LFO to my emulator. It was hard to find any games that make significant use of it, and even harder to find documentation on how it works. In the end, I had to rely on the Nuked OPN2 project to provide an explanation of the YM2612's internal circuitry.

I was looking around the Internet Archive for official Mega Drive development resources when I found this. It appears to be a much earlier revision of the development documents that we already have. What is notable about this version, however, is that its coverage of the console's sound hardware...

v1.0 Try it in your web browser: clownmdemu.clownacy.com Download: https://github.com/Clownacy/clownmdemu-frontend/releases/tag/v1.0 Read the full update report on the blog, since this forum doesn't let me post more than 20 images at once.

v1.2.0.1 https://github.com/Clownacy/ClownMapEd/releases/tag/v1.2.0.1 Selbi pointed out to me that v1.2 fails to load compressed data, so here's a hot-fix.

v1.2 https://github.com/Clownacy/ClownMapEd/releases/tag/v1.2 Changes Settings and sprite data are no longer lost when the program is closed. Up to 9 'save states' can be made, allowing work to be saved and resumed later. Tiles can be oriented vertically. Assembler error output is shown when...

(Cross-post from my blog) v0.8 Try it in your web browser: clownmdemu.clownacy.com Download: https://github.com/Clownacy/clownmdemu-frontend/releases/tag/v0.8.0.1 v0.8 is an update that was burdened by attempting a major change to the codebase. This change was meant to greatly improve the...

[Cross-post from the blog] Long time, no see! I have been busy with many things lately, leaving me with a backlog of projects to talk about, the most recent of which being a revised version of my C++23 Mega Drive toolchain! In summary, I have made some Bash scripts to automate the process of...

...such as to access the console's YM2612 sound chip. For this, volatile pointers are necessary: static volatile unsigned char &YM2612_A0 = *reinterpret_cast<volatile unsigned char*>(0xA04000); static volatile unsigned char &YM2612_D0 = *reinterpret_cast<volatile unsigned char*>(0xA04001)...

Implemented DMA Copy There is not much to say about this one: I do not know of a single game that uses DMA Copy, but Nemesis's VDP test suite includes a few tests for it, so I figured that I would finally implement the feature. DMA Copy copies bytes from one place in VRAM to another. It shares...

(Cross-post from the blog) v0.6 Try it in your web browser: clownmdemu.clownacy.com Download: https://github.com/Clownacy/clownmdemu-frontend/releases/tag/v0.6 Recently, I have been informed of various games that do not work correctly in my emulator by BlastBrothers, who has opened several...

I have fixed an inaccuracy that would affect padding bytes along with another inaccuracy that would cause S3K's Buggernaut tiles to compress inaccurately. An update that contains these fixes can be found here. I have extended the compressor's test suite to include Sonic 3 & Knuckles. Now...

Here is a Nemesis compressor and decompressor that I made. Notably, this compresses data identically to Sega's original Nemesis compressor. This is useful for disassemblies, as it allows assets to be stored uncompressed for ease of viewing and editing without causing the built ROM to become...

(Cross-post from the blog). v0.5.2 Here is a small update that fixes a few inaccuracies in order to get more games working. Try it in your web browser: clownmdemu.clownacy.com Download: https://github.com/Clownacy/clownmdemu-frontend/releases/tag/v0.5.2 Fixes for Sonic 3's Data Select and...

[Another cross-post from the blog. I figured that it is relevant here, being about creating a compressor for a compression format used by various Mega Drive games.] Long ago, I made a compressor for Kosinski, which is a compression format seemingly created by Sega and used in various Mega Drive...

[Cross-post from the blog] Recently, I fixed a couple of inaccuracies, and I thought they would be interesting to read about: Fixed the Title Cards in Sonic Crackers I've tested many Sonic games and ROM-hacks in my emulator, but I've never tried the famous Chaotix prototype - Sonic Crackers...

v0.5.1 Try it in your web browser: clownmdemu.clownacy.com Windows EXE: https://github.com/Clownacy/clownmdemu-frontend/releases/tag/v0.5.1 Source code: https://github.com/Clownacy/clownmdemu-frontend Even-Further-Improved Audio Playback It was pointed out to me that my Mega Drive emulator has...

[Crosspost from the blog] I was hoping to release this update after I finished adding support for the Mega CD, but progress on that has ground to a halt. Instead, the focus of this update will be the frontend! From features to refactoring to an entire port, here's what's new in clownmdemu...