Posted By
MMS
on 2022-03-29
15:55:13
 |  Re: Extending the capabilities of the 264 series
Very interesting project!
Actually BSZGG's RS232 Mouse project made the same approach for RS232, added a Max232 IC (circuit) to the already existing 6551 of the Plus/4, certainly C16 and C116 were out of this possibility (but the project never realized a usable small driver).
Just an idea. BTW via RS232 you may able to control a external MIDI device, like Yamaha, theoretically the MIDI is the good old RS232, just on Baud rate of 38400. the built-in 6551 maximum rate is 19800, But with an external xtal you may increase the Baud rate of 6551.
Yamaha YM2413: it was used in the MSX machines, but I feel it a little too limited. yeah, it has much more channels than the Yamaha YM2149 (=AY-3-8190), but I think it was more limited in a different ways
It is limited, not because it has only 2 waveforms, but because "YM2413 can only play one user-defined instrument at a time; the other 15 instrument settings are hard-coded and cannot be altered by the user.". that's a huge limitation.
It did not sound too bad (but I found it a little too streile), you can listen it here
https://www.youtube.com/watch?v=V0MXWXbTRng
https://www.youtube.com/watch?v=yucFVhoY6YA
You can compare here YM2413
https://www.youtube.com/watch?v=ITaJ5AJ2hGY
The MSX2+ video chip was a great development, no question about it. Great colors, attribute free high resolution gfx, 80 column text mode, hardware supported fill routines. 512 x 212 pixels x 16 colors from 512. Nice.
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