PSX Swap trick

[Shibathedog]

i have the SCPH-7501 model PSX and im wondering which swap trick to use and how? any help is appreciated.

 

The reason i need this is because 1. im too broke to buy a mod-chip 2. The swap trick i use now only supports 1 CD games

 

ill post my version of the swap trick i use as kinda a thank you but its probably not as good.

 

Thanks in advance!!