music dec tapes? (paper)

[allison]

On 01/03/2019 05:22 PM, Kyle Owen wrote:
> On Thu, Jan 3, 2019 at 3:29 PM allison via cctech
> <cctech at classiccmp.org <mailto:cctech at classiccmp.org>> wrote:
>
>     Those were likely with a PDP12 or LAB-8 with DAC board.  The code
>     actually is a roughly
>     digital version of tones in 10 or 12 bit form by writing sequential
>     words (waveforms) to
>     the DAC.  
>
>
> Do you have any information on the AA01-A DAC that was used with the
> PDP-12?

No but RICM as a PDP12or two.  Worth contacting them and all.  They
might like a copy of the
tapes if they don't already have them.

> I see in the PDP-12 System Reference Manual that it is capable of
> supporting three channels, 12 bits each. It gives an example of one
> instruction, 6551, which loads the first DAC. Is it safe to assume
> that 6552 and 6554 are the other instructions to load the other two DACs?
>
Unknown.

> I see the AA50-A in the 1972 PDP-8 Small Computer Handbook has
> sequential instructions for updating the DAC channels (up to 8).
>
> AA05-A/AA07 use a more complex address/data method to address more
> total channels, but that is listed in the Laboratory Computer Handbook
> as an option on the Negibus.
>
>
Never played with 8s in any form other than omnibus.

>     Of course everyone here forgets the First Philadelphia Computer Music
>     Festival on vinyl from '78
>     with samples of computer played music.  I run my copy on occasion just
>     to remember being there.
>
>
> I don't think this album has been forgotten; I have a copy, and I know
> others with copies, too. It seems as though "Unplayed by Human Hands"
> (both versions) are less well-known. I would like to work on getting
> the original software archived, assuming it's still out there, as it
> ran on a Straight-8.
>
ITs also on line.

Allison