1983 Philips 26CS3890/05R Teletext & Printer
MRG Systems ATP600 Databridge
Teletext Editing Terminal
Microvitec Monitor 1451MS4
BBC Microcomputer TELETEXT Project
Viewdata, Prestel, Philips
Philips Model Identification
1976/77 Rank Arena AC6333 – Worlds First Teletext Receiver
PYE 1980s Brochure
Ceefax (Teletext) Turns 50
Philips 1980s KT3 – K30 Range Brochure
Zanussi Television Brochure 1982
Ferguson Videostar Review
She soon put that down
1983 Sanyo Brochure
Wireless World Teletext Decoder
Unitra Brochure
Rediffusion CITAC (MK4A)
Thorn TRUMPS 2
Grundig Brochure 1984
The Obscure and missing Continental
G11 Television 1978 – 1980
Reditune
Hitachi VIP201P C.E.D Player
Thorn 3D01 – VHD VideoDisc Player
Granada Television Brochure, 1970s
Long Gone UK TV Shops
Memories of a Derwent Field Service Engineer
PYE Australia Circa 1971
Radios-TV VRAT
Fabulous Fablon
Thorn TX10 Chassis
Crusty-TV Museum, Analogue TV Network
Philips N1500 Warning!
Rumbelows
Thorn EMI Advertising
Thorn’s Guide to Servicing a VCR
Ferguson 3V24 De-Robed
Want to tell us a story?
Video Circuits V15 – Tripler Tester
Thorn Chassis Guide
Remove Teletext Lines & VCR Problems
Suggestions
Website Refresh
Colour TV Brochures
1970s Lounge Recreation
CrustyTV Vintage Television Museum
Linda Lovelace Experience
Humbars on a Sony KV2702
1972 Ultra 6713
1983 Philips 26CS3890/05R Teletext & Printer
MRG Systems ATP600 Databridge
Teletext Editing Terminal
Microvitec Monitor 1451MS4
BBC Microcomputer TELETEXT Project
Viewdata, Prestel, Philips
Philips Model Identification
1976/77 Rank Arena AC6333 – Worlds First Teletext Receiver
PYE 1980s Brochure
Ceefax (Teletext) Turns 50
Philips 1980s KT3 – K30 Range Brochure
Zanussi Television Brochure 1982
Ferguson Videostar Review
She soon put that down
1983 Sanyo Brochure
Wireless World Teletext Decoder
Unitra Brochure
Rediffusion CITAC (MK4A)
Thorn TRUMPS 2
Grundig Brochure 1984
The Obscure and missing Continental
G11 Television 1978 – 1980
Reditune
Hitachi VIP201P C.E.D Player
Thorn 3D01 – VHD VideoDisc Player
Granada Television Brochure, 1970s
Long Gone UK TV Shops
Memories of a Derwent Field Service Engineer
PYE Australia Circa 1971
Radios-TV VRAT
Fabulous Fablon
Thorn TX10 Chassis
Crusty-TV Museum, Analogue TV Network
Philips N1500 Warning!
Rumbelows
Thorn EMI Advertising
Thorn’s Guide to Servicing a VCR
Ferguson 3V24 De-Robed
Want to tell us a story?
Video Circuits V15 – Tripler Tester
Thorn Chassis Guide
Remove Teletext Lines & VCR Problems
Suggestions
Website Refresh
Colour TV Brochures
1970s Lounge Recreation
CrustyTV Vintage Television Museum
Linda Lovelace Experience
Humbars on a Sony KV2702
1972 Ultra 6713
News Hedghog L Standards Converter

The FPGA's needed to build the previous Hedghog's have become very difficult if not impossible to get. The Hedghog L is in response to that.
The Hedghog L uses a iCE40HX1K FPGA and a PIC microcontroller. The FPGA is very small compared to the Cyclone FPGA's used in earlier Hedghog's. So much so that before I tried I did not know if even the most basic converter would fit in it. It was chosen mainly because at the time of starting this project there was a good number of them in stock.
As much as possible of the workings of the converter was farmed out to the PIC so as to leave as much room as possible free in the FPGA. Even after doing that the converter had to be pruned back hard in order to get it to fit.
It uses a 2 line interpolater as it was all that would fit.
It has an option of equalising pulses and also can do aspect ratio of 4:3 in to 4:3 or 5:4 out.
Doing 16:9 in to 4:3 or 5:4 out would need little more space but would not fit.
One way of obtaining more functionality is to use a multiple boot system to programme the FPGA. With a number of programme images stored in flash memory. Each image can have a totally different function to each other. Depending on which function is required the appropriate image can be loaded into the FPGA.
To this end I have used 4 programme images.
1 is a 405 line converter with 4:3 input 4:3/5:4 output.
2 is a 405 line converter with 16:9 input 4:3/5:4 output.
3 is a 405 line test card.
4 is a 819 line converter4:3 input 4:3 output.
It also has a programmable multi standard modulator
The PIC now does the programming of the modulators and the video decoder. It also provides the 4 MHz clock for the modulators, drives the LCD and reads the encoders.
It's performance isn't up to that of previous Hedghog's but that said it still does a reasonably good conversion.
Details can be found here
Frank

Not available in kit form yet.?

Hi Michael
I don't supply Hedghog's or kits. You could contact forum member @freya. As he supplies Hedghog's
Frank

Nice work squeezing it into a smaller chip! I might have to have a go at building one, I’m still using both my Hedghog 1’s that I built a while back, still working well!
Regards,
Lloyd

Hi Lloyd
Great to hear that your Hedghog 1's are still working well.
I think all you will need is on that web page. If there is anything you want to know just ask.
Frank

🤣 🤣 🤣
I hadn't thought of it in that way, but how apt.
I designated it "L" to mark the move to Lattice FPGA.
Frank

I contacted Stephen for a ready built converter. It arrived today and I am very pleased with it. Easy to use, comprehensive instructions are supplied. I connected it to my faithful Dynatron and it works very well!
I have taken a couple of pictures. This is a slightly early birthday present to myself it will be my bench converter and means I won't have to keep unplugging the other Hedghog each time I want 405 on the bench.
Thanks Frank - thanks Stephen ! Much appreciated!
Rich.
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