zjuyzj / opl2lpt-replica Goto Github PK
View Code? Open in Web Editor NEWA re-designed, simplified version of OPL2LPT Adlib-Compatible sound card working on printer port.
License: MIT License
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opl2lpt-replica's Issues
Bill of materials (BOM)
Greetings,
Is it possible to share a file listing de needed materials (TXT file) in order to build this PCB?
I tried to search it through the directories but I didn't find it.
Thanks!
Audio is malfunctioning
I assembled this OPL2LPT replica using all linked parts from mouser and YM3812 from the linked aliexpress seller. I socketed all chips. Sometimes there is a very strong humming noise coming out of the speakers and other times FM music playback in games gets all desynced and broken. This is not a very good start... I used 1k resistors and a 100pf cap on the crystal circuitry. I test it on IBM Thinkpad T23 on Windows 98SE DOS mode
74HC04 vs SN7404n notice
a second hand IC maked "sn7404n england" works fine with 470 ohm resister
but a brandly new IC maked "74HC04" from JLC market need a 4.7k ohm resister to work with.
i have no idea about why , just post here for people who might need it.
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