New demo uploaded: Audio Demo - Invention 13 (used in Commodore promotions)

rje · Post by **rje** » Wed Jan 13, 2021 8:09 pm

Audio Demo - Invention 13 (used in Commodore promotions)

I was missing Bach's "Invention 13", and so here's the first 13 bars that Commodore Business Machines used in the early 80s for Commodore product promotions.

Submitter

rje

Submitted

01/13/21

Category

Demos

rje · Post by **rje** » Wed Jan 13, 2021 8:18 pm

As mentioned above, I think there are a couple of improvements to make:

(1) The waveforms. I think the bass waveform is too quiet. I can adjust volumes, or change waveform.

(2) I think there's an error in the bass waveform. I'd have to listen to it nice and slow and carefully to be sure.

(3) I want to convert the X16 graphic butterfly to a sprite (I know how) and use it in a graphic display to go along with the song.

rje · Post by **rje** » Wed Jan 13, 2021 8:51 pm

Found one bug -- an F instead of F#. Might be another one in there somewhere!!

rje · Post by **rje** » Thu Jan 14, 2021 12:25 am

OK, I converted a 64 x 64 verison of the X16 logo, and encoded it into runlength DATA in BASIC. Gnarly!

Anyway it does things. Not beautiful, but it's a start.

FYI:

To store it in DATA statements without runlength encoding takes around 20K.

To store that as runlength DATA takes under 7K.

rje · Post by **rje** » Thu Jan 14, 2021 8:07 pm

OK, I reformatted this to look like the C64 promotional at the end of the 1983 Christmas Demo. I figured I could push some of the X16's features while playing that little ditty from Bach.

And I backed off a bit on the sprites, so they're more subtle, but still there of course.

Perifractic · Post by **Perifractic** » Fri Jan 15, 2021 5:58 am

Very nice! But you got the date a year late. Probably [emoji39]

rje · Post by **rje** » Fri Jan 15, 2021 2:57 pm

8 hours ago, Perifractic said:

Very nice! But you got the date a year late. Probably

"Under promise, over deliver"

rje · Post by **rje** » Fri Jan 15, 2021 9:15 pm

I'll give it a 50-50 chance for 2021. A lot can happen between Proto 2 and Release Candidate X: things can go super smooth (in which case I'm thinking July) or things can be rough (2022).

This prediction brought to you out of near complete ignorance.