[GTALUG] CRT memories [was Re: IBM - cache skirmish story.]

[Alvin Starr]

On 04/24/2018 10:37 PM, James Knott via talk wrote:
> On 04/24/2018 10:33 PM, Alvin Starr via talk wrote:
>>>> At one point there were spring based audio delay devices use for
>>>> adding reverb but they quickly got replaced with memory based
>>>> solutions when dram started showing up.
>>> They weren't spring based, just a loose coil of wire.
>>>
>>>
>> Take a look at https://en.wikipedia.org/wiki/Reverberation under
>> Spring reverberators.
>> These are the ones I knew of but there may have been some other
>> devices based on other operating principles.
> I remember those reverb springs, from back when I was a kid.  The delay
> lines I'm referring to look like the one pictured in this link.
> https://en.wikipedia.org/wiki/Delay_line_memory#Magnetostrictive_delay_lines
>
Ah now that is interesting.
Sending bits down the line as sound waves is an interesting concept.
You would need to feed them from the output back into the input along 
with some timing signals to use it for memory.
I got into computers when core memory was on its way out so I never got 
to see any systems built using this kind of technology.

cheap mass produced bits in silicon has made a whole bunch of really 
interesting technologies go away.


-- 
Alvin Starr                   ||   land:  (905)513-7688
Netvel Inc.                   ||   Cell:  (416)806-0133
alvin at netvel.net              ||