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hofster

Viditel prototype cartridge

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Hi,

 

New user here since i never was a TI-99 user myself...

 

I have recently found a Viditel / Prestel / Bildschirmtext prototype cartridge that I would like to know more about. I have dumped the ROM and and made a short write-up and posted some pictures of it here: https://perhof.wordpress.com/2020/04/13/ti-99-viditel-cartridge/

 

I hope anyone could tell me more about that little gem.

 

TI-99_ViditelCartrige_small.jpg

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I seem to remember that most of the countries in Europe were using a version of the Viditel/Prestel/Bildschirmtext system. It survived in France a lot longer than anywhere else. I also seem to remember that the communications protocols were the same for all of them, as the national networks were somewhat connected to each other. The Internet pretty much put a stake through it though. . .

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wow hofster! very nice! i never seen it, very interesting! thanks for sharing all :)

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Here's it running on real hw..

7d9592b37093b1047d49803a1cae4cf5.jpg

Sent from my LM-G820 using Tapatalk


Sweet!
Are you running it from a cartridge or from a disk?
Where did you get it from?

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9 hours ago, hofster said:

Sweet!
Are you running it from a cartridge or from a disk?
Where did you get it from?

I ran the cartridge binary from the link in the first post of this thread..  I just dropped it into my finalgrom99 sd card.. 

 

Greg

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Just now, arcadeshopper said:

I ran the cartridge binary from the link in the first post of this thread..  I just dropped it into my finalgrom99 sd card.. 

 

Greg

Nice. Thanks for trying it out.

I see that you got further than me. Is that because you have a serial port available or did you even have a modem?

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3 minutes ago, hofster said:

Nice. Thanks for trying it out.

I see that you got further than me. Is that because you have a serial port available or did you even have a modem?

Yes my system has a rs232 card..  I didn't try with a modem yet as it seems to require servers that don't exist anymore.. if someone has information on how to telnet to a compatible server I can try with a wifimodem 

 

Greg

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16 hours ago, arcadeshopper said:

Yes my system has a rs232 card..  I didn't try with a modem yet as it seems to require servers that don't exist anymore.. if someone has information on how to telnet to a compatible server I can try with a wifimodem 

 

Greg

I don't know how to setup a connection through a wifimodem but there seems to be a Prestel compatible (same protocol as Viditel as I understand it) server at glastty.com:6502

https://glasstty.com/wiki/index.php/The_TELSTAR_Videotex_System

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Here is a MAME cartridge. The German version seems to lock up in a loop, as I saw in the debugger, but the other languages work. I don't get out of the splash screen, though.

 

viditel.rpk

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Posted (edited)

 

Maybe you need a Decoder ?  ;) (ah, this is for Videotext)

 

BTX-Dekoder-v1.1-Oliver-Arnold--01.thumb.JPG.290e0c1189a5f135ba1b7a45aa76db02.JPG

 

 

 

 

 

 

 

 

Edited by Schmitzi
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As I saw, Viditel is the Dutch counterpart of the German BTX (Bildschirmtext), not "Videotext".  :)

 

(Isn't it fascinating that Videotext (teletext) survived until today, basically unchanged since the late 70s?)

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I remember somebody (french or belgium?) showed me as a Teenager on the TI Treff in Vienna in 1995 how they are parsing information from the Teletext (Bildschirmtext), precisely stock exchange data, in an automated way, on a regular basis to produce statistic data on certain stocks and aiming to predict how the numbers will evolve. I was only 15 and my english was not the best, and it was a lot of tech bubbling from the guy.

Oliver Arnold and Berry Harmsen were both on the same event, but it was none of them.

My brother and me still remember to this day the famous french accent phrase from that guy "...and here you can see information from the teletext."

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Do you know this product from Texas Instruments Teletext decoder in the years 1977.

The character generator ROM was the 74S262 chip. (TIFAX font)

This font was originally generated by the Texas Instruments TIFAX teletext decoder as used in the very first teletext televisions.

 

Here are some pictures of the cards I have.

 

https://www.radios-tv.co.uk/ceefax-teletext/

 

Jean Louis

 

20200419_105130.thumb.jpg.27b7aa86af8327c1623545a0105a64bb.jpg20200419_105153.thumb.jpg.702d053d2a018e8ab0fe26c4b203f64d.jpg20200419_105103.thumb.jpg.27add5a217edfec027c6c6a9bb52b6f0.jpgtifax.thumb.jpg.90915cd8e8ad9fa375cf98196f163fd9.jpgTifax-XM-11.thumb.jpg.8b0a997adf8bf658183269091eea2a0c.jpg

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Today, exactly 50 years ago, on June, 1th, 1970, the first Teletext started in Germany (on ARD & ZDF)

 

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Teletext, was a project from me in the early 90`s.

On the picture from Quadrunner you see a Teletext-Converter of me. The Converter needs a Video-Signal from a TV (or satellite receiver), a TI with 32k and a RS232 to connect it to the TI. The hardware I developed was much easier than the TI Teletex version, cause it uses only a SA5246 teletext decoder which is controlled by the I2C Bus and a level converter (5V to 12V).

The software (written in C99) controls the converter, loads till to 4 pages equally (and subpages), shows the pages using a teletext characterset, and save it to disk or dump it to a printer. Depending on your hardware it may load 16-512 pages in memory (using a 512k GRAM card oder 192k-VRAM). Using a 80-column graphic card shows you two pages on screen, so you may read the pages in memory in one window and in the other window it searches the new pages.

Another program uses a script file to save selected pages automaticly on disk. It supports a IR controlling to start your receiver and to change TV programs. So it was possible to get a daily weather report, stock exchange data, cooking recipes, etc.

 

 

 

 

 

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