df99

New hardware blue box chip - Attiny85

2 posts in this topic

Back in 2007, I designed a blue box for use with my ProjectMF server, a telephone PBX switch that allows phone phreaking in a manner similar to the old days of in-band signalling - MF and SF audio tones. That blue box was based upon the PIC 12F683 8-pin DIP microcontroller. Phil Lapsley ("Exploding the Phone") designed a PCB board for it and many aspiring phreaks have built the circuit over the years.

 

One issue with the original code was that it was written in PicBASIC Pro. PicBASIC had a "tone" command that could produce two simultaneous tones if a 20MHz oscillator was used. However, the tone generation never sounded quite right.

 

David Griffith, a vintage telephony and computer buff, decided to re-write my code in C. He followed the same general design principles as I used in my 2007 box, but added some very impressive features and - most importantly - the tones sound great! The code now runs on a modern 8-bin ATTINY85 microcontroller. Dave has also designed circuit boards for the chip and circuit. However, I found the circuit is straightforward enough to build on protoboard, which allowed me to produce this replica of the blue box featured on the first page of the famous October, 1971 Esquire magazine article which popularized phone phreaking.

 

 

Dave's code may be found at: https://gitlab.com/DavidGriffith/blue...

 

Manual, schematic and and precompiled .hex files at: https://661.org/proj/bluebox/

 

df99

 

 

 

0

Share this post


Link to post
Share on other sites

Back in 2007, I designed a blue box for use with my ProjectMF server, a telephone PBX switch that allows phone phreaking in a manner similar to the old days of in-band signalling - MF and SF audio tones. That blue box was based upon the PIC 12F683 8-pin DIP microcontroller. Phil Lapsley ("Exploding the Phone") designed a PCB board for it and many aspiring phreaks have built the circuit over the years.

 

One issue with the original code was that it was written in PicBASIC Pro. PicBASIC had a "tone" command that could produce two simultaneous tones if a 20MHz oscillator was used. However, the tone generation never sounded quite right.

 

David Griffith, a vintage telephony and computer buff, decided to re-write my code in C. He followed the same general design principles as I used in my 2007 box, but added some very impressive features and - most importantly - the tones sound great! The code now runs on a modern 8-bin ATTINY85 microcontroller. Dave has also designed circuit boards for the chip and circuit. However, I found the circuit is straightforward enough to build on protoboard, which allowed me to produce this replica of the blue box featured on the first page of the famous October, 1971 Esquire magazine article which popularized phone phreaking.

 

 

Dave's code may be found at: https://gitlab.com/DavidGriffith/blue...

 

Manual, schematic and and precompiled .hex files at: https://661.org/proj/bluebox/

 

df99

 

 

 

Edited by df99
Spelling
0

Share this post


Link to post
Share on other sites

Create an account or sign in to comment

You need to be a member in order to leave a comment

Create an account

Sign up for a new account in our community. It's easy!


Register a new account

Sign in

Already have an account? Sign in here.


Sign In Now