ti99-4a 6pin din plug wiring

[amiles]

So my mum just gave me my first computer out of the loft to have fun with and I was really disapointed that when I plugged it all in to the LED samsung tv I have via the aerial I got a black screen. Played around a bit and long story short the tv knows it's looking at an analog signal but other than a little static when turnign the unit on and off nothing happened. So we tried an old CRT dvd tv ....again no luck other than for the TV to acknowledge it's looking for something.....

 

So we assumed it was the Din plug socket as the plastic casing is open and wires exposed....then a week of surfing the net and several versions of how to wire this retched plug have left us perplexed as to IF it's another component so partner removed the need for the aerial coaxial cable and installed a two pin red/yellow AV cable as shown in the mods. Yet this has not improved the case. Still perplexed as to the 'correct' UK wiring for the DIN. As there have been sooooooo many diagrams it's very clear that not one person has the correct answer. I knew then I need to ask the experts because one diagram ont he italian page linked via the pinned post shows words rather than colour cables....so trying to figure out a) if white is audio or 12v or ground or pizza is problem 1. b) trying to figure out if we read these diagrams as the front or the back of the plug ie if we are reversing the colours or just getting it completely the wrong order which is problem 2.

 

Can anyone help a girl out?

[GDMike]

Love pizza myself. Red usually audio though if on a rca jack

Edited March 11, 2020 by GDMike

[amiles]

So this is just 3 of the diagrams I have found ....

[amiles]

so any advice over which is the right way to wire the 6 pins would be helpful and which way to read either from the rear or the front of the diagrams as you can see they all claim to be european wiring for the ti99-4a

[blackbox]

Use the second picture of the female connection, this is clearly labelled with the pins when viewed from this viewpoint.

 

Note the 12v lurking there and be very careful not to connect 12v to an unsuspecting video line.

Note especially that this is not an RGB or composite video socket.  The output here is analog  "PAL Colour Difference".  There is no RGB here.  And TI did a really bad job of engineering this, it was quite some distance from the standard and very unlikely you can find a colour monitor that will take it today, although you may find a mono monitor will work.

 

 

The MODULATOR box that you have contains a standard third party RF Modulator which outputs to Channel 36,  PLUS the circuit needed to transfer the colour difference console output to the composite that RF modulators require, and it is possible to extract a composite signal by tapping into the input of the internal modulator component

.

 

 

The UK used a different PAL standard to Europe (!) with a wider gap between audio channel and video channel, which caused some problems tuning our UK tv sets to the TI RF Modulator output which was European.

You may be able to find an analog tv set (PAL)  that allows you to tune to Channel 36- and connect the metal modulator box to the tv with an aerial connector. The TV set will need to find Channel 36 and you may need to use the tv set auto-tuning with the computer connected.

 

  Perhaps a little easier, some of us use very old video cassette recorders with UHF PAL tuners and SCART output to connect to a modernish tv set- the tape transport can be shot, you only need the tuner, so may find one quite cheap. You will still need to tune a channel on the old VCR to Channel 36.

 

 

have fun....  s
 

[GDMike]

I found out as I tried to wire just the ground, center and one other pin thinking that I'd get rgb to my rgb in tv. But nooo..

Is there any easier way, I have a DIN plug that connects to the TI and I tried a rgb in to vga adapter, but nooo..I did get a TI screen, but distorted and missing color.

I was hoping the adapter would solve it.

[amiles]

I saw a video on YouTube about a fix for the black and white issue gdmike might be worth a stab.