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Super Gameboy weirdness
Trying to diagnose what's going on here. The pics below are a plain SNES with SGB (no Game Genie, natch). The games play as normal on a DMG Gameboy, so it's not likely an issue with the carts' MBC or...
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Does anyone know what this board is?
Statistics: Posted by emuman — Sun Sep 22, 2024 11:34 am — Replies 4 — Views 321
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USA NES with UA6548
I bought a USA NES with a broken PPU. I replaced the PPU with a UA6538 PAL PPU. Lifted the 18. pin (CLK) and connected to a homebrew 26,6Mhz oscillator. It worked fine in 50Hz. Then i got a UA6548...
View ArticleQuestion about AMROM wiring.
Found a very beat up Narc cart for $1.99 and would like to up date it to Narc Uncut rom hack. I'm confused about the wiring. The game is AMROM. Would I be using this wiring scheme?AMROM -> AOROM...
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Fire Game Converter: how exactly does it work?
Hello,I'm into making repro carts for myself and to test them, if I don't already have a soldered CIC chip inside, I use the Fire Game Converter like this one:to use the CIC chip from the cart sitting...
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[Solved] PPU strange behavior
Hi! this is my first post.I'm trying to write an emulator. In order to correct so many many bugs my emulator compares its current status with the nestest log. That way I managed to pass nestest in the...
View ArticleI made a sprite optimization tool
This is the first non-ASM project I ever successfully created. Just upload a BMP or PNG and move 16x16 sprites around the screen until you cover up your character drawing, and it will display the...
View ArticleIssue with maps
Basically, I'm trying to build a room in a map in quarters--there's a certain number of possible patterns stored in bank 1, all under the label "quarters." There's another section directly beneath it...
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Fire Hawk Camerica UNROM Mirroring doubt !
Hi guys, How Camerica Fire Hawk mirroring work?Camerica mapper 71 is UNROM without bus conflict, ( thanks to Fisher and Lidnariq ) but How this circuit work??Its The only game with mirroring mapper...
View ArticleDifferent PPU's = same colors?
I've been slightly messing around with the RPC204-0001 and RPC204-0003 PPU's but are having some issues here..Assume color $1C (red) on the 0003 does it look exactly the same on screen as color $2 on...
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Development idea for your emulator, sort of
I've thought about this for years but never actually got around to fix it. How about creating a custom fileselector (developed in a clever way so many can make use of it) for your emulator that is...
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Bung Game Doctor SF III Kicad Files
Hello All,I bought a non-working SF III that was missing the memory card addon and decided to reverse engineer the PCB to make my own. Here are the files in case anyone else may find them useful.There...
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Joypad contact and bounce tests
I wrote two new test ROMs that reads 12 bits of controller data every scanline and displays them using BGnVOFS tricks.I've used the tests to find my best controller. I've written about my findings on...
View ArticleReading and writing data to disk in FDS
Hi there. I'm developing my original FDS game with original 3D printed disk. (https://x.com/HSA_Entmt/status/1829779467293900948)My work is almost completed. But I couldn't implement save high...
View Articleabout mapper evolution
Mapper #260 - HP10xx/HP20xx -> Mapper #176 - ESC/Waixing FK23CMapper #422 - Coolboy -> Mapper #268 - Coolboy, Mindkids AA6023Mapper #473 - Coolbaby --|Mapper #342 - Coolgirl ----|--> Mapper...
View ArticleDPCM Wavetables
The interesting and useful thing about the APU DMC is that it only cares about $4012 and $4013 when a sample is started or loops. You can change them at any other time. This means that you can get...
View ArticleDirect Page Memory Access in NMI Handler
Hi everyone,I started with building my own SNES emulator from scratch a few weeks ago. I'm making good progress and already get some graphics output.However, today I stumbled across a problem that I...
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sprite priority - excitebike
Hello everyone,I'm trying to properly implement sprite priorities.I detect that the sprite below has background priority, so it should be behind the background (the priority is deactivated in the...
View ArticleNew hardware for old hardware
Just came across these videos about the "Checkmate Display". Thought it was interesting - not for me but maybe others on the forum.https://youtu.be/iUKQhCGUHWc (uploaded a year...
View ArticleHigueul, new C-like language
Hello,I have created a new language, so the goal in mind was to target more modern but exotic processors, or for the SNES (65816).If I decided to make my own language, it is mainly because C is not...
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