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alexkerhead
May 14th, 2006, 09:40 PM
This is amazing, these songs from 1978 and 1979 sound as good as newer midi music.
http://www.vintagecomputermusic.com/

I like the canon in d major (http://www.vintagecomputermusic.com/mp3/s1t9-Canon_in_Dmajor.mp3) the best.

carlsson
May 15th, 2006, 02:15 AM
Yeah, some of those synthesizers are quite impressive. I still wonder which was the first qualified integrated sound chip, and whether any of those expansion cards use such. From what I gather, the General Instruments AY-3-891X should've been available at least by 1979, perhaps earlier. Assuming POKEY is present in Atari 400, it should be of the same vintage. The VIC-I chip later used in VIC-20 is said to have existed around 1976/77, but Brian Bagnall's most recent book suggests that Commodore redesigned the chip quite a lot by 1980. I don't know about the TI SN76477 and SN76489 etc.


Music is encoded from sheet music with note pitch and duration being described with a single 8-bit byte.
That is even more amazing. Assuming they use a note table and the synth has a range of about 2.5 octaves (32 values, 5 bits), it would leave three bits to encode eight different durations. I've done something similar on the VIC-20, but I assigned one duration as an escape code to get longer or more exact durations using another byte, total 16 bits. If I understand correctly, each note on the Cosmac system is divided into 16 segments and one could in real time adjust amplitude to get envelope control.

CP/M User
May 15th, 2006, 03:34 AM
alexkerhead wrote:

> This is amazing, these songs from 1978 and 1979 sound
> as good as newer midi music.

Why ain't I suprised to see this in the Vintage Computer Music
site:

Lennon & McCartney/Hey Jude Andrew Modia 1:43


Many years ago - somebody sent in a CPC type-in of this song.
I always thought it was translated very nicely - so perhaps
they got the right notes & produced the tune. Think it went
for a bit longer though - over 3 minutes. Still well done -
the CPC had 3 channel sound thingo - so I guess it more than
enough to cope! :-)

Somebody did a very nice digital translation of Greensleves
(in 10 line of BASIC! ;-) Not sure if this midi stuff is what
started it?