PS1Digital first impressions review and installation - PS1 HDMI - William Quade
PlayStation HDMI Cable (PS1, PS2) — Gametrog
PS1 PS2 To 1080p HDMI Converter With 3.5mm Audio Out - Walmart.com
PS1digital review: the ultimate HDMI option for PlayStation 1 | Eurogamer.net
Added an HDMI port to my original PlayStation, don't think I've seen this done before so thought I'd share my results : r/psx
PS2 to HDMI Converter For PS2 PS1 PlayStation 1/2 Game Consoles With RGB to YPbPr Switch – Bitfunx
Cingc Playstation to HDMI Converter Adapter 1080P HD Link Cable for PS1 PS2 PS3 Better Colour Saturation Compatible with PS1/ 2/3 to HDM U1P7 - Walmart.com