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March 23, 2019

Surprise, surprise!

(español abajo)

I needed a break from full system cores. So I finally started adding YM2610 (NeoGeo) capabilities to my OPN FM core JT12 (used in the Megadrive and CAPCOM arcade cores). I wrote the RTL code for the first 6 ADPCM channels yesterday. But before hooking those up, I had to test the FM output pitch. Surprisingly, default JT12 settings for 6 FM channels matched the sampling rate of 55.5kHz when operated at 8MHz (YM2610) and I got correct pitch at the first attempt!

The audio of this post has been generated with JT12.

(Spanish)

Me apetecía parar un poco de pensar en el Popeye y en los demás sistemas completos. Así que me puse por fin con el YM2610 (NeoGeo). La idea es añadir las nuevas funciones al core que ya hice de YM2612/YM2203, mi JT12. Ayer escribí el código RTL para los primeros seis canales de ADPCM pero antes de conectarlos al resto de sistema tenía que probar si los canales FM sonarían con el tono adecuado que espra la NeoGeo. Y sorprendentemente, los parámetros por defecto del JT12 daban 55.5kHz de salida cuando el reloj son 8MHz (YM2610) ¡así que sonó bien a la primera!

El audio de esta entrada lo he hecho con el JT12.

Comments (9)

m
modca · March 23, 2019

Wow great job👍😀

D
Don Gafford · March 23, 2019

Awesome!!!!

R
Ruben Aparicio · March 23, 2019

Mola jaja

C
Carl Hagström · March 23, 2019

Yay, good job! 💪👍

A
Adam Strojs · March 23, 2019

Thank you, thank you, thank you!

R
RetroLarry/RealLarry · March 23, 2019

Very nice, good job! And maybe this one is of interest for you: <a href="https://github.com/trcwm/Speech256" rel="nofollow noopener" target="_blank">https://github.com/trcwm/Speech256</a>

8
80's spaceman · March 23, 2019

WAO!

U
UltimateMiSTer.com · March 23, 2019

The NeoGeo MVS will be shipped Monday to you. Hopes will give some help.

A
Andrew Moore · March 23, 2019

That's incredible! What great luck! I can't wait to a NG core with sound on the MiSTer.