RTC Patch for Pokemon Crystal/Gold/Silver

disassembled from:
https://www.infine.st/
https://www.romhacking.net/hacks/4450/

Thank you infinest for the original patch.

"This patch allows the player to change the real-time clock while in the Pokegears clock menu.
Simply press up to advance and down to turn back the time.
Holding the A button allows you to change it faster."

The disassembly uses RGBDS's RGBLINK overlaying features.
Thanks to marcobledo's batteryless patcher for an example how to use it.

How to build roms/patches

1. get a pokemon crystal/gold/silver rom and save it to roms/"romname"/input.gbc
2. install rgbds and flips
3. run make

instead of running make, you can build it manually:

rgbasm -opokegold_rtc.o --define _RTC --preinclude roms/pokegold/settings.asm src/main.asm
rgblink -o pokegold_rtc.gbc -O roms/pokegold/input.gbc pokegold_rtc.o
rm pokegold_rtc.o
rgbfix -p0 -v pokegold_rtc.gbc
flips --create --bps roms/pokegold/input.gbc pokegold_rtc.gbc pokegold_rtc.bps

How to add new targets

to build a new target you need to do the following things

• create a folder called roms/"romname"
• copy the baserom to roms/"romname"/input.gbc
• create a roms/"romname"/settings.asm file
• rtc patches are only created, if _RTC is found in settings.asm
• batteryless patches are only created, if _BATTERYLESS is found in settings.asm