i tested some PSX/PS1 games on anbernic RG35xx Plus and it's already new firmware too.

PS1 / PSX / Playstation One Game :

Chapters :
00:00 Intro
00:16 Lucky Luke
03:53 Point Blank
06:28 Street Fighter EX2Plus
09:55 Suikoden


RG 35XX Plus comes with three color options: black transparent, white, and retro gray. It supports ported games, PSP, NDS, DOS, DC, and more than 30 other platform games. Equipped with 5G WiFi, supports moonlight streaming, online sparring etc... HDMI output to TV, unlocks the form of home console. Bluetooth 4.2, supports the connection of multiple wireless Bluetooth handles. Games make happiness easier~

Colors: black transparent/white/gray
Screen: 3.5-inch IPS full viewing angle, OCA full lamination/ 640*480
CPU: H700 quad-core ARM Cortex-A53, 1.5GHz frequency
GPU: Dual core G31 MP2
RAM: LPDDR4 1GB
System: Linux
Battery:Li-polymer battery 3300mAh, lasting 8 hours
Extended features: Support 2.4G wireless and wired controller, Bluetooth Handle Connection，HDMI output TV, vibration motor, WIFI online pairing, streaming.
Games: ported games, PSP, DOS, NDS, PS1, DC, ARCAD, GBA, GBC, GB, SFC, FC, MAME, MD, GG, PCE, NGPC, SMS, WSC, etc. Support users to download games in related formats.