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04-26-24 09:49 PM |
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| 0 users currently in ROM Hacking | 2 guests |
| Main - ROM Hacking - Scanline or Interrupts? | New thread | New reply |
| RetroRain |
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 Fuzz Ball Level: 66 Posts: 582/994 EXP: 2438280 Next: 23571 Since: 09-30-07 Last post: 1935 days Last view: 958 days |
I posted this in the General SMB3 Hacking Thread, but incase it gets overlooked, I made a new thread.
How are the graphics for the status bar able to be shown if they are not loaded in the Pattern Tables? Does it have to do with the scanline or interrupts? 
Thanks. ____________________ My YouTube Channel |
| infidelity |
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Fuzz Ball Level: 66 Posts: 206/968 EXP: 2368140 Next: 93711 Since: 05-24-07 Last post: 959 days Last view: 815 days |
I think its scanline. Kuja showed me an irq trick years back, that enables you to load up any pattern table for whatever irq is going on.
EDIT - Stealing wifi with my laptop. Here's an example from my Ultra 2 storyline about X. The white text is whats not in the actual PPU, but is being loaded somewhere else by an irq. It is being stored into 80-FF in my BG PPU. 
Code LDA $2002 LDA #$00 LDY #$03 STY $2006 STA $2006 LDA $FF ORA #$01 STA $2000 LDA #$00 STA $2005 STA $2005 LDA #$xx ;which pattern table to load from (00,01=$0000-$0FFF)(02-05=$1000-$1FFF) STA $8000 LDA #$xx ;address to load gfx from 'for my game' (00=$80010, 02=$80810, 04=$81010) STA $8001 JMP $xxxx ;this jumps to the following code... STA $E000 PLA TAY PLA TAX PLA PLP RTI |
| never-obsolete |
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 Rat Level: 24 Posts: 83/96 EXP: 74498 Next: 3627 Since: 02-22-07 From: Phoenix, AZ Last post: 2596 days Last view: 2596 days |
It's a little of both...you set an interrupt to fire at a particular scanline. In the interrupt handler, you write to the ppu and/or mapper to create whatever effect you are going for. Usually there is some timed code involved so that graphic/palette changes will happen during hblank and not muck up the display (assuming rendering is enabled). |
| Main - ROM Hacking - Scanline or Interrupts? | New thread | New reply |
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