GAMEBOY MBC3 LDO-SRAM Memory Card

Thanks to two contributors for their articles on the GAMEBOY MBC3 LDO-SRAM memory card 
:
【Physically Verified】GameBoy/ADVANCE Card Reader - JLCPCB EDA Open Source Hardware Platform (oshwhub.com)
GitHub - MouseBiteLabs/Game-Boy-MBC3-Cartridge: A flashable MBC3-based cartridge for the Game Boy.
 
I drew it myself and optimized the parts by adding labels.
Game compatibility depends on individual play; I can't guarantee it will work for all.
I hope someone can draw a better one; I'll treat you to lard!
The original author's drawing is very beautiful, but unfortunately, I can't support LCPCB, and he uses a 5V chip.
 
Main text (Muggle tutorial):
MBC3 is compatible with MBC1+MBC2+MBC3 games; some MBC1 games are not compatible, and
the prototype is based on a 0.8mm thickness.
 
A: If you don't use a battery or SRAM, short-circuit SJ1+2 and SJ41+2. You can burn some MBC1s that don't need to be saved.
 
 
B: Using SRAM, there are two cases (battery saving is required; removing the battery will retain memory for 3 minutes):
1. 32k (8-bit) SRAM, requires shorting SJ51+2 and SJ61+2.
2. 256k (8-bit) SRAM, requires shorting SJ52+3 and SJ62+3.
 
C: There are 3 types of MBC3 chips (MBC3, MBC3A, MBC3B), and the shorting locations differ:
1. MBC3: Short SJ31+2, requires soldering Q1.
2. MBC3A, MBC3B: Short SJ32+3, does not require soldering Q1.
Below is the original author's nice diagram and my simpler one (just to get the gist).
 
D: Unused components C1, C4, R8. Short RESET and 3V3. Use a standard tubular crystal oscillator, which can be directly removed from the original cartridge; BOM packages are not recommended.
 
E: This card cannot be recognized by the programmer when burned via the AD port.
Solutions: 1. Directly modify the fc_DMG_29LV160DB.TXT file (this will allow direct recognition). 2. Save a different modified file, but you will need to manually select the flashcart each time you burn the card.
Two files are provided below; choose whichever you need. Folder path: FlashGBXconfig