Comments (3)
hrydgard
commented on August 20, 2024
I don't think much reverse engineering is needed. GPI is a set of manual on/off switches, GPO is a bunch of LEDs, presumably. Each I believe is 8 bits in size, so 8 switches and 8 LEDs, and the API to access them is simply the sceKernelSetGPO / sceKernelGetGPI functions.
It's just an implementation task, storing/loading the value, and adding some way to toggle the inputs and display the outputs.
Really not sure what kind of UI we'd want for this.. Ideas welcome!
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hrydgard
commented on August 20, 2024
This was a fun one to code up. #19136 implements this, let me know what you think.
GPI switches are currently stored between game sessions but not saved if you close PPSSPP. Not sure what behavior we want there. Maybe they should also be stored in save states..
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Sukotto-1999
commented on August 20, 2024
All done! Turns out, PaRappa the Rapper and Ghostbusters The Video Game aren't the only games on PSP with secrets accessible on a PSP dev kit. Now should find all PSP games with secrets accessible with a PSP dev kit.
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Related Issues (20)
- Crash on startup (Vulkan relate?) HOT 4
- [WIndows] GOD EATER BURST Append Edition can't certification GOD EATER Disc. HOT 2
- PPSSPP v1.17.1 crashes due to `sceGuCopyImage` being fed bad address HOT 2
- (Libretro) Close content option freez frontend HOT 1
- Feature Request: Add an option switch to use font files from the game ROM. HOT 5
- iOS: When connecting an iPhone to TV for display output, audio is not working
- Add ability to change camera near clipping HOT 3
- Regression - Game: "Gensou Suikoden - Tsumugareshi Hyakunen no Toki" Shows Black Squares in Some Text on Any Build Beyond 1.16.6 HOT 7
- Digimon Adventure PSP NPJH-50686 bad voices sound on non video cutscenes. HOT 1
- GTA Chinatown Crash At Mails Or GPS HOT 2
- Odd texture issue with the flashlight in Silent Hill: Origins HOT 1
- More Format Specifiers for strings for function sceKernelPrintf HOT 1
- CPU at 100% in menu in Vulkan on Linux HOT 2
- Vulkan: Crash on Intel Xe after Mali fix HOT 1
- Crash in menu reported since v1.17.1-383 on some devices HOT 1
- Control mapping: Weird UI navigation issue, sections collapsing HOT 1
- Assorted iOS issues HOT 2
- IR Interpreter optimization ideas
- Always crashing on startup after choosing PPSSPP Folder HOT 4
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