Earl(y|iest) recording of computer music

[Roger Holmes]

> Message: 28
> Date: Thu, 19 Jun 2008 21:41:57 -0500
> From: Jim Leonard <trixter at oldskool.org>
> Sellam Ismail wrote:
>> This is very cool:
>>
>> http://news.bbc.co.uk/2/hi/technology/7458479.stm
>
> Unfortunately, no mention of how the machine produced the sound...

I expect it was the same as slightly later mainframes, every time a  
conditional jump instruction actually jumps, it flips the speaker to  
the opposite state. When single shotting a program this is useful as  
you can hear a click and know to not carry on down the list of  
instructions, and when a program is running you can hear the tone  
change as it does different tasks (because the size of the loops are  
different). My 1301 has a three of four instruction program which  
uses the variable delay of the multiply instruction to make a ghostly  
sound.