Getting midi out Yamaha YMF715(OPL3-SA3) from weird laptop \ VOGONS

Getting midi out Yamaha YMF715(OPL3-SA3) from weird laptop

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First post, by Navecitas

Posted on 2023-10-19, 17:48

Navecitas Offline

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Rank: Newbie
Posts: 3
Joined: 2022-04-08, 13:06

This laptop has a useless screen, it literally fell to pieces when unfolding it. only a label: PMD-5700
It came with manuals, one of them on the Yamaha YMF715 (OPL3-SA3).

But it didn't have a game port for midi out. drill a hole for 3.5 mm. stereo jack

Disassembly and research on yamaha chip:

Works good, midi out tested on a Roland RA-50 and SC-D70

Delete or move if this topic don´t go here

Reply 1 of 2, by Tiido

Posted on 2023-10-19, 18:01

Tiido Offline

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Posts: 2974
Joined: 2018-01-14, 04:40
Location: Norway (used to be Estonia)

You shouldn't use the AVDD but instead DVDD for the MIDI part, there will be a bit less interference that way. But definitely a way to get going ~

T-04YBSC, a new YMF71x based sound card & Official VOGONS thread about it
Newly made 4MB 60ns 30pin SIMMs ~
mida sa loed ? nagunii aru ei saa 😜

Reply 2 of 2, by Navecitas

Posted on 2023-10-19, 18:33

Navecitas Offline

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Rank: Newbie
Posts: 3
Joined: 2022-04-08, 13:06

Tiido wrote on 2023-10-19, 18:01:

You shouldn't use the AVDD but instead DVDD for the MIDI part, there will be a bit less interference that way. But definitely a way to get going ~

Ok i can see on the datasheet DVDD(digital power supply) = 5v or 3.3v.
i´ll test those pins. if they have 5v. I´ll change the mod
Thanks

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