You need to hack your vita first.
You need a sd2vita and a micro SD card.
https://www.cfwaifu.com/sd2vita/
You can also send files via ftp.
Filezilla:
https://filezilla-project.org/download.php
To send files using ftp, you need to launch VitaShell and press the [Select] button to activate FTP or USB mode.
In VitaShell, press [Start] and select [SELECT button] to toggle between FTP and USB mode.
In filezilla enter the address displayed on your PS Vita in the Host selection. And 1337 in the Port selection.
Host: [ftp://xxx.xxx.xxx.xxx] Port: [1337]
Press Quickconnect.
Press o on your vita to stop the ftp.
You also need basilist Il for ps vita:
https://archive.org/download/macos755_202405/BasiliskII_Vita_v0.33h.vpk
Install the vpk in the usual way. Then copy the Basilisk ll folder in the archive to ux0:data.
Mac os 7.5.5 bootable disk image:
http://www.unna.org/unna/development/NewtonDev/macos755-boot.zip
Extract macos755-boot.zip and copy macos755.disk to ux0:data/BasiliskII/hardfiles
Performa 630 rom:
https://github.com/macmade/Macintosh-ROMs/blob/main/Performa-630.ROM
Copy Performa-630.ROM to ux0:data/BasiliskII/roms
You can also download everything from here:
https://drive.google.com/drive/folders/1j3XylTz97xpeTbg-If9mRr8-pjzQoJJK?usp=drive_link
https://archive.org/details/macos755_202405
You also can download mac os 7.X.X and 8.X here:
https://winworldpc.com/product/mac-os-7/75
https://winworldpc.com/product/mac-os-8/80-final
https://web.archive.org/web/20210414042543/https://redundantrobot.com/sheepshaver
https://github.com/macmade/Macintosh-ROMs
Start Basilisk II go to Graphics/Sound and change the screen mode to 512x384.
Go back and go to Memory/Misc and set MacOS RAM Size (MB) to 64.
Set Mac Model ID to Mac IIci (MacOS 7.x)
Set CPU Type to 68040
Press ROM file and select Performa-630.ROM
Go back and go to Volumes.
Set Boot From to Any
Set Vita MemStick to on
Press File and select macos755.disk
Go back and press o to start mac os 7.5.5
The end result should look like this:
https://old.reddit.com/r/vitahacks/comments/16dzp7o/run_mac_os_755_on_your_ps_vita/