![]() ![]() Then the IRQs does something like change the CHR banks, or change scrolling to the status bar, only if the main game ordered it so. There is always a IRQ triggering at 2 different positions on the screen, regardless of other parameters. So VirtuaNES is always wrong, that's kind of fun.įinally, I found interesting how Gradius II handles its IRQs. I've got a lot of shaking bars in VirtuaNES, and weirdly when the real bar is shaking it's not in VirtuaNES. Note that I'm unsure if dynamical BG animation is based on this table or not, at the end of the first level the games changes the BG bank used via IRQ, so I guess it's not, it adds or substract from the "normal" bank.Īlso if anyone has an idea why a MMC3 IRQ could vary randomly by an amout of one (resulting in a shaking bar) I'm listening. I guess one have to try to change the order of the banks, possibly duplicating data so that each numbers in sprite data are consecutive numbers (this can be applied to the original ROM), and thrus re-arrange the CHRROM as needed. In the MMC3 version sprites part 2 and sprites part 4 are ignored, and are "substitued" by sprites part 1 + 1 and sprites part 3 + 1 instead, which don't always works. Bytes comes in this order : BG part 1, BG part 2. The game have a huge table of 256 bytes (that's 32 "virtual" 8 KB banks) located in the main PRG bank at $EA1D (location in iNES ROM is $1EA2D). I guess I could go through the trouble of editing the game's CHRROM in order to work on MMC3, but I fell I've done enough work with this game today.Īnyone is free to try it, for information the games swaps "virtual 8 KB banks", which are consisted of 8 bytes of 1 KB bank. Finally I've got the game freeze randomly several time when too much objects are on screen, don't know why (with VirtuaNES). (if there is any during gameplay this may screw IRQs up). I don't know if there is any sprites from the BG bank exept the cursor in the secret sound mode. The ending has screwed up graphics as well because the game swaps bg and sprites banks to normal via $2000 (I've made them backwards so that MMC3 IRQ counter works). ![]() I now played though the whole game (savestates rules !!) and yeah, a lot of sprites are screwed on later levels (comes from the wrong CHR bank), but everything is perfect on the first level, and I don't know how an human person is able to pass it on the real hardware (who lack savestates) even with the 30 lives code. Yeah but for some reason I didn't want to go though the trouble of making a ips file. Or add a 2KB RAM on a TLROM board yourself if you want. is happening.Īlso the game uses a 2KB SRAM I think so TSROM will be needed at least, I guess. There is absolutely nothing to do about this !! This is really the thing that makes we wonder what the f. But the really weird thing is that as soon as the game starts, graphics are perfect, but the player dies immediately, and again, again until it's game over. The graphics are scrabled at opening for some reason I don't know, they work perfect in any other emulator. Nestopia : This is the weirdest thing I've ever seen in emulation. I cannot find why, I always setup the IRQ at the exact same time during NMI. Nintendulator : The status bar is shaking by one pixel for some reason. The game works perfect in all inacurate emulators (including Nesticle !), but I've the two following issues : I still haven't completed the game as a whole to see if there is scrambled graphics later, but for now I encountered none, I haven't had to change anything in the CHRROM (yet). The player controls a spaceship as it moves through a series of levels, shooting enemies and collecting power-ups.Okay, I've spent my day hacking the game to MMC3 with sucess. Gradius is a side-scrolling shooter game released in 1987 for the arcade. Gradius Emulator has been featured in Wired magazine, PC Gamer, and The Verge. The latest version, released in 2018, supports a wide range of arcade hardware, including the Neo Geo MVS, Super Nintendo Entertainment System, Sega Genesis, and Game Boy Advance. The emulator was first released in 2002 and has been updated multiple times since. Gradius Emulator is based on the original Gradius emulator written by Daisuke Amaya. It supports a wide range of arcade hardware, including the Neo Geo MVS, Super Nintendo Entertainment System, Sega Genesis, and Game Boy Advance. Gradius Emulator is available for Windows, macOS, and Linux. It was originally written by Daisuke Amaya in C++ and released in 2002. Gradius Emulator is a free, open-source emulator for the arcade game Gradius. Press the A button to fire the laser and the B button to fire the missiles. Open the emulator and load the Gradius ROM.ģ. Download and install the NES emulator for your device.Ģ. ![]() ![]() Supported Devices: Android, iOS, Windows, Linuxġ. ![]()
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