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Freebander
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Registered: 12-2010
Location: the Black Country
Posts: 188
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ever invented something Useless?


having recently bought an EPROM eraser and programmer, to back-up some old (20+ year old eproms)for another couple decades worth of use, and also having over 70+ EPROMS pulled from stuff over the years, I decided it was time to have a play about with this more than ample excess.

I had a 27512 EPROM that would erase all but for One location! (probaly dust on the chip itself), and I didn`t want to risk Over erasing it.

so rather than bin it, I thought I`d use it in an experiment that`s been on my mind for sometime now (a "What If?" type of idea).

so I wrote a simple program in the 1`st 255 bytes of the rom, and Basically what it does, is contain 1 more than the address is resides in.

so address 00 contains 01, addr 01 contains 02 in it`s data, addr 02 contains 03 as its data etc...

all the way up to addr 255 which then contains 00!

so in effect, and for those that have No Idea what i`m talking about;

it`s the Digital equiv of 255 rooms, and each room has a letter in it saying to go to Next Room, and this is done 255 times, until you get to the Last Room, and then the letter tells you to go Back to the 1`st room, and so the cycle begins again...

I then wire up the Data lines to the Address lines, enable the chip etc... and apply power (+5v).

well... it Works! and kicks out plenty RF too emoticon
so I`v invented a Purely Digital Oscillator that requires no xtal, RC, LC or anything, just a set of instructions that a simple Memory chip has to Blindly follow, ad-infinitum.

so, Proof of concept, Sure!
but I cannot think of any application for such a thing????

although I Will state that the freq out Will change when the eprom window is exposed to sunlight, if that`s any good for anything?

so, this is My contribution to useless Inventions emoticon








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I`m also on Twitter as "YT2095" ;)
1/May/2011, 11:57 am Link to this post Send Email to YT2095   Send PM to YT2095 Blog
 
Hot Fusion Profile
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Registered: 03-2008
Location: South West England
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Re: ever invented something Useless?


A delay line of some sort?
If you stop the program redirecting to the start address, you have a timed delay, the duration of which is dependant on the chip's architecture. (or amount of light on the window.)

What sort of duration are we looking at to sequence the addresses? Is it in the order of microseconds or longer than this? Going by the RF generation capabilities I'd expect it's pretty fast.

It could make a pretty stable oscillator for the VLF/LF bands, with the ability to tune it using an LED. FM modulator???

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Andy - FB107
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YT2095 Profile
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Freebander
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Registered: 12-2010
Location: the Black Country
Posts: 188
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Re: ever invented something Useless?


I get wierd spot frequencies up to ~43 MHz some at 38 some at 29, 22, 13 etc... it`s really strange!

I can`t come up with a Complete LOCK on Any freq???

it`s just hash when you do get a "lock".

it`s basically an RF Mess, with a single chip.

 I Am wondering if this freq change can be expoited when reading the wrap around data as it May affect each memory domain and may serve as a "poor mans" CCD device???

but that`s probably pie in the sky .


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I`m also on Twitter as "YT2095" ;)
1/May/2011, 3:58 pm Link to this post Send Email to YT2095   Send PM to YT2095 Blog
 
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Freebander
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Registered: 12-2010
Location: the Black Country
Posts: 188
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Re: ever invented something Useless?


I asked a fellow EE about this and he mentioned something interesting, so after a bit of research it turns out that this "device" is actually something called a Finite State Machine, so I searched a bit more about these State Machines and it would seem that my early CPU designs were in fact based on the State Machine architecture as well.

so score yet another one for re-inventing the wheel emoticon

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I`m also on Twitter as "YT2095" ;)
4/May/2011, 8:27 am Link to this post Send Email to YT2095   Send PM to YT2095 Blog
 
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Re: ever invented something Useless?


Yes, but in re-inventing the wheel, you learn. emoticon

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Andy - FB107
4/May/2011, 8:05 pm Link to this post Send Email to Hot Fusion   Send PM to Hot Fusion
 


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