File list (Check if you may need any files):
51pwm
.....\ASM
.....\...\PWM
.....\...\...\PWM
.....\...\...\PWM.ASM
.....\...\...\PWM.HEX
.....\...\...\PWM.LNP
.....\...\...\PWM.LST
.....\...\...\PWM.M51
.....\...\...\PWM.OBJ
.....\...\...\pwm.Opt
.....\...\...\PWM.PLG
.....\...\...\pwm.Uv2
.....\...\...\pwm_Opt.Bak
.....\...\...\pwm_Uv2.Bak
.....\C51
.....\...\C51
.....\...\...\EX
.....\...\...\EX.C
.....\...\...\EX.HEX
.....\...\...\EX.LNP
.....\...\...\Ex.LST
.....\...\...\EX.M51
.....\...\...\Ex.OBJ
.....\...\...\EX.Opt
.....\...\...\EX.PLG
.....\...\...\EX.Uv2
.....\...\...\EX3.Opt
.....\...\...\EX_Opt.Bak
.....\...\...\EX_Uv2.Bak
.....\...\...\STARTUP.A51
.....\...\...\STARTUP.LST
.....\...\...\Startup.OBJ