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).
GRADIUS 2 FAMICOM FREE
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).
Okay, I've spent my day hacking the game to MMC3 with sucess.
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