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Talk:Mega Man 3 (DOS)

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This page of sprite rips links to a file named "PC3Unused.gif" that has the scientist and forklift graphics, plus more: close up of Mega Man and different buster attachments; green shockwave; some kind of ground covering; and a worm creature. They credit the same "S & F Productions" already credited on the wiki page. Mouser (talk) 14:03, 16 May 2018 (EDT)

That worm creature is in the game, but the game won't show the whole thing. BTW the game only stores the forklift graphics in parts. I put them together. I don't know how high the forks should go, so I just guessed something. Frenkel of "S & F Productions" (talk) 18:15, 25 August 2018 (EDT)

Unused code for a 16 color Tandy mode

I saw in the revision history descriptions that Mouser didn't reverse engineer the invincibility cheat in this game. So I did that to see if there are more cheats. There aren't, but I found something else: You can press the f key on the setup menu and the letter "f" will appear next to the "Start Game" menu item. This would disable waiting for vertical retrace in the 16 color Tandy mode. There is some code in the executable for this graphics mode, but choosing Tandy mode just runs the game in 4 color CGA mode. Should this be added on this page? Frenkel (talk) 18:47, 25 August 2018 (EDT)

Yeah! Add it to the page. Nice find. Mouser (talk) 13:49, 4 November 2018 (EST)
I have been working on these two games recently, and I found code for a Tandy mode in the first game, which I have now documented at Mega Man (DOS). However, I did not find any equivalent code in Mega Man 3, only CGA and EGA modes. The 'F' key appears to disable the installation of a timer interrupt (08h), though I haven't determined what the timer interrupt is used for. It doesn't appear to be used to time frames, though? - Rainwarrior (talk) 17:59, 31 July 2019 (EDT)
I thought of a different way to search for relevant Tandy mode 9 code and it seems like it does still exist in MM3 as well, with a driver entry point at cs:749Ah. - Rainwarrior (talk) 18:15, 31 July 2019 (EDT)
Just to follow up, the Tandy mode code has not as many functions as the others (16 instead of 19) and for the 16 function pointers it does try to set up, it writes them to the wrong address. The first 16 functions do seem to correlate directly to the first 16 of the CGA/EGA drivers, so I'd presume it was at least partially functional at some point in development but then just abandoned, and later there were more driver functions needed and the table moved. Unfortunately not close enough to a working state for me to want to investigate like I did with the first game, but I guess this means that the developer tried twice to get Tandy 16-color going and failed? Interesting. - Rainwarrior (talk) 18:32, 31 July 2019 (EDT)

Eco Man

Tyler Wilde in PC Gamer, 2017:

Mega Man 3 for DOS ... started as a different game, called Eco Man, which featured a character in a hazmat suit exploring non-linear levels on an oil rig and ship. Hi-Tech Expression said it would publish the game if it were reskinned as a Mega Man game. So that's why, in the video below, you see a bizarre, off-model Mega Man swimming animation.

Lizstar mentions it in her AGDQ 2020 run:

All of the levels in this game are on either oil rigs or in the ocean. This game has an interesting story behind it, and all of it is themed around environmentalism, of all things.

...

To explain, let me go into the deep, varied lore of the Mega Man DOS universe. So this game was made by one dude, his name is Rozner, he is a good dude. It's definitely not easy to make a game by yourself. And for what this is, honestly, I love this game.

...

He made Mega Man 1. He worked at Capcom, and he made it literally as a test to see if he could make DOS games, and turns out, he could. So when he left, independently for other reasons, he messaged back his friends at Capcom, he's like, "Hey I made a Mega Man game, you all want to license it?" And they said, sure. Like I said in my last run, I don't think they looked at it, but they were like, yeah, sure. Capcom allowed that once. That is not the extent of their sins. Then Rozner was working on a personal project using this dude here, this is Eco Man, I believe he is now Radioactive Man. He was making a game where you play as Eco Man, it controls kind of like Mega Man, you choose between some levels, there's a lot of swimming in it, it has an environmental theme. He messaged his friends back at Capcom, and was like, "Hey, I made this game, you all want to license it?" And they go, "Yeah that looks good. Hey are you the guy who made Mega Man DOS? Why don't you just turn him into Mega Man? It's close enough." And he went, "Yeah, sure." So, not only did they allow Mega Man 1 DOS to happen, but they purposefully wanted this. And that is the reason this exists.

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