Rebuilding an 80's Motorola 4500x 'transportable' phone

[RobvdVeer]

No problrm, Thanks for checking anyway! 

[HiHat]

Please keep us informed of your progress. I am very interested as I am tackling such a project myself.

I have a 2900 series Motorola Bag phone which I want to modify for GSM. I plan to "decode" the multiplexed three wire data bus to be able to manipulate the handset without modifying it.

Have you seen this project ?
http://handya.co.nz/post/43198336217/texting-brick-phone

[RobvdVeer]

I'm taking a little break from electronics right now, but intend to finish it later on, seeing i'm already this close to finishing.

[Hiddenvision]

I know this is old but

I plan to "decode" the multiplexed three wire data bus to be able to manipulate the handset without modifying it.

I have some old PIC code that used to talk on the 3-wire-bus.
Not sure how much help it would be
Shout if you want it.