Small suggestion: do not use PSX to refer to the PS1, especially when talking about the PS2. Although PSX was the original name/codename for the PS1, it was later used to refer to the PSX "DVR"
PS-X, not PSX and if you open a PS1 EXE in hex editor the header still says PS-X. Offset 0 1 2 3 4 5 6 7 8 9 A B C D E F 00000000 50 53 2D 58 20 45 58 45 00 00 00 00 00 00 00 00 PS-X EXE........ 00000010 C0 10 01 80 00 00 00 00 00 00 01 80 00 00 1E 00 À..€.......€.... 00000020 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 ................ 00000030 F0 FF 1F 80 00 00 00 00 00 00 00 00 00 00 00 00 ðÿ.€............ 00000040 00 00 00 00 00 00 00 00 00 00 00 00 53 6F 6E 79 ............Sony 00000050 20 43 6F 6D 70 75 74 65 72 20 45 6E 74 65 72 74 Computer Entert 00000060 61 69 6E 6D 65 6E 74 20 49 6E 63 2E 20 66 6F 72 ainment Inc. for 00000070 20 4E 6F 72 74 68 20 41 6D 65 72 69 63 61 20 61 North America a 00000080 72 65 61 00 00 00 00 00 00 00 00 00 00 00 00 00 rea.............