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04-25-24 08:39 AM |
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| Main - ROM Hacking - How do you assign graphics to numbers? | New thread | New reply |
| RetroRain |
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 Fuzz Ball Level: 66 Posts: 593/994 EXP: 2437968 Next: 23883 Since: 09-30-07 Last post: 1934 days Last view: 956 days |
Let's say you program a new routine for a game, and you use a free RAM address. Now you want display the number of that RAM address using the graphics for the numbers in the game. How would you go about doing that? It is something I always wondered about, since I never wound up doing that before. Now obviously with the NES it is going to involve the PPU. I know how to write graphics using the PPU, but I don't know how I would have the number in RAM be converted to graphics. ____________________ My YouTube Channel |
| infidelity |
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Fuzz Ball Level: 66 Posts: 226/968 EXP: 2367844 Next: 94007 Since: 05-24-07 Last post: 957 days Last view: 813 days |
Is this about what chr bank you want to be displayed in your ppu? |
| RetroRain |
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Fuzz Ball Level: 66 Posts: 594/994 EXP: 2437968 Next: 23883 Since: 09-30-07 Last post: 1934 days Last view: 956 days |
No. For instance, you know how you programmed in Zelda, for arrows to have their own RAM address? How do you make the game display the number for the arrows? In other words, how do you make the game use the font for numbers and display it?
It would be impractical and I assume it wouldn't work to have a compare for each number. If Arrows = 1, then LDA #$56 (Tile $56, lets say it is the number 0) STA $2007 LDA #$57 (Tile $57, lets say it is the number 1) STA $2007 So, if Arrows = 1, then it will show the graphics "01". Do you get what I'm saying? How do you display the contents of the RAM address visually? ____________________ My YouTube Channel |
| infidelity |
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Fuzz Ball Level: 66 Posts: 228/968 EXP: 2367844 Next: 94007 Since: 05-24-07 Last post: 957 days Last view: 813 days |
Example. A921 8D062O A900 8D0620 after that, either A5xx or ADxxxx 8D0720 60. I know another method, but you need to know where in ram the vram engine is. |
| RetroRain |
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Fuzz Ball Level: 66 Posts: 595/994 EXP: 2437968 Next: 23883 Since: 09-30-07 Last post: 1934 days Last view: 956 days |
Wait, so you're telling me you can simply call the RAM address, and write it to $2007 itself, without writing an actual tile? And writing the RAM address will automatically translate that into the graphics from the PPU? ____________________ My YouTube Channel |
| Mattrizzle |
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 Red Cheep-cheep Level: 33 Posts: 194/202 EXP: 226318 Next: 2861 Since: 04-21-07 From: United States Last post: 2419 days Last view: 2380 days |
I'm not entirely sure if this will work, as I've never programmed anything for the NES (This was adapted from SNES code). Perhaps it will at least lead you in the right direction:
This example assumes that the value is stored in decimal, and that the numeric tile graphics are in order from 0 to 9. ____________________ |
| Main - ROM Hacking - How do you assign graphics to numbers? | New thread | New reply |
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