TI-99/4A -TO- TV CABLE
Theodore Blitsas
TI-99/4A - to - TV cable? I have already seen some schematics on the
Net as to how to make a cable that will end in a scart outlet - I mean
separate video and audio outputs. What I want is a cable that will
connect to a TV's antenna input.
Thank you all
Bait for spammers (With credit to E. Needham):
root@localhost
postmaster@localhost
admin@localhost
abuse@localhost
Steve Hayter
wrote:
>Can please someone give me [simple] instructions how to make a
>TI-99/4A - to - TV cable? I have already seen some schematics on the
>Net as to how to make a cable that will end in a scart outlet - I mean
>separate video and audio outputs. What I want is a cable that will
>connect to a TV's antenna input.
>Thank you all
Unfortunately it's not that simple. There's more than a cable
involved - you need the RF modulator (hardware that actually generates
a TV signal).
There's typically a multitude of various RF modulators available at
electronics surplus stores, but I don't know what kind of success
you'd have in adapting an IBM (or whatever) modulator to work with the
99/4A. Anyone??
Steve
GB Basics
>involved - you need the RF modulator (hardware that actually generates
>a TV signal).
>
>There's typically a multitude of various RF modulators available at
>electronics surplus stores, but I don't know what kind of success
>you'd have in adapting an IBM (or whatever) modulator to work with the
>99/4A. Anyone??
>
>
I just learned the reverse. I tried to modify (by cutting off the TI-99/4A
composite plug and replacing it with a RCA plug to the shielded video input
wires) a TI-99/4A RF modulator to work with a signal from a PC throught a
'TView Micro' (a device that allows a PC monitor image to be shown on a
standard TV set) without success. Radio Shack carries a RF modulator that
works well with a PC, but may not work with the TI-99/4A.
Good luck. It isn't as straight forward as I had thought.
Glenn (GBBa...@aol.com)
~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
| No one is responsible for anything I say but me. |
| (And sometimes I have doubts about myself.) |
~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
DAVID L. ORMAND
>>Unfortunately it's not that simple. There's more than a cable
>>involved - you need the RF modulator (hardware that actually generates
>>a TV signal).
>>
>>There's typically a multitude of various RF modulators available at
>>electronics surplus stores, but I don't know what kind of success
>>you'd have in adapting an IBM (or whatever) modulator to work with the
>>99/4A. Anyone??
>>
>>
>
>I just learned the reverse. I tried to modify (by cutting off the TI-99/4A
>composite plug and replacing it with a RCA plug to the shielded video input
>wires) a TI-99/4A RF modulator to work with a signal from a PC throught a
>'TView Micro' (a device that allows a PC monitor image to be shown on a
>standard TV set) without success. Radio Shack carries a RF modulator that
>works well with a PC, but may not work with the TI-99/4A.
Must have missed the first in this thread.
The TI puts out composite video and analog. If your television has
A/V jacks on it, you can make an easy cable that will give you a better
quality picture than you could ever get with a modulator. Otherwise,
you need an RF modulator that converts composite to Ch. 3/4. You might
be able to get these from specialty houses, etc., or maybe other home
computers that do the same thing that the TI does. But if this is your
only option, you would be much better off getting a TI RF Modulator
from a TIer here or on the List.
TI99 Mailing List:
Email "majo...@theriver.com" with "SUBSCRIBE TI99" in the body.
--
***********************************************************
* David Ormand | Be Different! *
* dlor...@aztec.asu.edu | Support resistance computers! *
* Tucson, Arizona | TI-99/4A Atari ST *
Adrienne Bourque
: The TI puts out composite video and analog. If your television has
: A/V jacks on it, you can make an easy cable that will give you a better
: quality picture than you could ever get with a modulator.
How would one go about making such a cable? (i.e., what are the pinouts
from the TI composite cable to A/V?)
thanks
-adrienne
DAVID L. ORMAND
>>Can please someone give me [simple] instructions how to make a
>>TI-99/4A - to - TV cable? I have already seen some schematics on the
>>Net as to how to make a cable that will end in a scart outlet - I mean
>>separate video and audio outputs. What I want is a cable that will
>>connect to a TV's antenna input.
>>Thank you all
>
>involved - you need the RF modulator (hardware that actually generates
>a TV signal).
>
>There's typically a multitude of various RF modulators available at
>electronics surplus stores, but I don't know what kind of success
>you'd have in adapting an IBM (or whatever) modulator to work with the
>99/4A. Anyone??
Not as easy as just asking here or on the List if anyone has a TI
RF Modulator they'd sell. With the ease and superior quality of using
direct A/V cables, not too many die-hard TIers use the Modulator anymore.
I might have one, myself, but I'd have to look.
Theodore Blitsas
wrote:
>
>>>Can please someone give me [simple] instructions how to make a
>>>TI-99/4A - to - TV cable? I have already seen some schematics on the
>>>Net as to how to make a cable that will end in a scart outlet - I mean
>>>separate video and audio outputs. What I want is a cable that will
>>>connect to a TV's antenna input.
.....snipped...
>Not as easy as just asking here or on the List if anyone has a TI
>RF Modulator they'd sell. With the ease and superior quality of using
>direct A/V cables, not too many die-hard TIers use the Modulator anymore.
>I might have one, myself, but I'd have to look.
>--
Thanx everyone for answering my question.
I have made an A/V cable. I used a "hit-and-miss" procedure, where I
tried various compinations of pins to the RCA outlets. The only ones
that gave results are those bellow:
I connected pin 4 (Y) and pin U (GND) with an RCA outlet for the
Composite Video, and pin 3 (Sound output) and pin U (GND) with another
RCA outlet for Sound Output. It works fine and I see the computer's
screen on my TV, hear the sound too. Crystal clear both.
The only problem is that everything is in Black & White :-) No Color!
Perhaps I should find an RF modulator cable and connect it to my TV's
antenna input.
Of course it may be that my TI-99/4A has gone bad and transmits only
in Black & White, then wouldn't even an RF cable produce the same (non
color) results?
Oh, I forgot to note that my machine is "made in USA" but the PSU says
"made in W.Germany". Is that significant?
Steve Hayter
wrote:
.
.
.
>Of course it may be that my TI-99/4A has gone bad and transmits only
>in Black & White, then wouldn't even an RF cable produce the same (non
>color) results?
This is really easy to fix. Open up the TI and locate the video
circuitry, it's located inside the metal box (shield) that's attached
to the motherboard.
Inside the box you'll see a little potentiometer. Hook up the power
and the console to your monitor (or TV A/V jacks) and turn the system
on.
Using a PLASTIC screwdriver tweak the POT to the left or right until
the color comes on.
I've repaired six consoles like this. Nothing really broken it's just
that the consoles weren't tuned properly, right from the factory.
On another note, I've found brand new RF modulators that look
IDENTICAL to the TI modulator at a local surplus store. I'll pick one
up next week and see if I can get it to work (requires replacing the
cable). If it does, I'm willing to buy a batch and modify them for
anyone who needs one (or a spare). Dunno what they'll end up costing
though, so it may not be worth it. (I think they're about $8 each and
I'll need about $3 in parts to modify them)... (Canadian funds)
S.
byat...@my-dejanews.com
Ok, how about answering a question for me? I've got a 4A I added 32kx16 on
the system bus, 8k supercart, etc. However, the video flickers every 2 to 3
seconds. It's not the modulator (I've tried different cables, including the
TI monitor cable to RCA jacks), it doesn't appear to be the connector on the
TI either... What should I look for? The flicker is one of "brightness", if
you get my meaning.
-----------== Posted via Deja News, The Discussion Network ==----------
http://www.dejanews.com/ Search, Read, Discuss, or Start Your Own