UK Vintage Radio Repair and Restoration Discussion Forum - View Single Post

terrykc · 5th Mar 2012, 2:34 pm

Absolutely fantastic!

One observation - I would have preferred a more optimistic weather forecast ...

This reminds me of a Philips pattern generator we had in the late 80s which generated a teletext test page using only one line per field!

I can't remember anything about the test page - except that I thought it was rubbish! So, I took the test page from our Viewdata system, modified it slightly, and replaced the PROM image in the generator.

I recalled a bit of the Broadcast Teletext Specification which, as far as I know, anybody has ever used, which says that rows can be transmitted in any order.

As rows 11 and 12 of my page contained ENGINEERING TEST PAGE in double height, I started with that, followed by rows 13, 10,14,9,15,8 etc.

With the page spread over 24 frames, the appearance was reminiscent of a faster version of the well known Thames TV ident ...

5th Mar 2012, 2:34 pm	#38
terrykc Rest in Peace Join Date: Nov 2010 Location: North Hykeham, Lincolnshire, UK. Posts: 515	Re: IMOGen Test Card & Teletext Generator Absolutely fantastic! One observation - I would have preferred a more optimistic weather forecast ... This reminds me of a Philips pattern generator we had in the late 80s which generated a teletext test page using only one line per field! I can't remember anything about the test page - except that I thought it was rubbish! So, I took the test page from our Viewdata system, modified it slightly, and replaced the PROM image in the generator. I recalled a bit of the Broadcast Teletext Specification which, as far as I know, anybody has ever used, which says that rows can be transmitted in any order. As rows 11 and 12 of my page contained ENGINEERING TEST PAGE in double height, I started with that, followed by rows 13, 10,14,9,15,8 etc. With the page spread over 24 frames, the appearance was reminiscent of a faster version of the well known Thames TV ident ...