I've been working on my first proper hardware project recently to get myself familiarised with VHDL and hardware design better (I still intend to return to doing an Enterprise on a chip one day!). I've just checked the Enterprise schematics, and it can also be used on the Enterprise -- it's an HDMI port add-on!

I found the biggest problem with old computers was attaching them to modern TV's and monitors. The picture through RF is terrible, and SCART isn't perfect, so I thought "how hard can it be to add HDMI?!". Apparently quite hard. Hehe. 

I have written an HDMI encoder IP core which will output a 720x576p image directly from a little FPGA board with sound over HDMI. My early prototype has one bit of colour coming from the Atari ST shifter chip and being encoded into the HDMI stream. The picture is rubbish and you can barely tell what it is, but it's a working proof of concept!

I currently have a small batch of prototype PCB's being made in China which I should be able to get working properly with a full colour (or so I hope).

The great thing is, this will work with any computer which you can tap the RGB lines directly. The Enterprise has the 8 bits of colour data and sync signals coming out of the Nick chip to the LM1886, which is perfect for tapping.

The original thread can be found here: http://www.atari-forum.com/viewtopic.php?t=24684.

I hope to bring HDMI to all old machines eventually... 

When will you try it with the Enterprise?

Hello Mr,
 What kind of circuit are you going to use to this project?
 I am courious, when and who will first invent the one chip EP computer.

Thank you for your explanation, it is always fantastic hearing about some new development, which based on the EP.
My question is aimed to inquire exactly which type of IC you use to achieve your developement? As answer manufacturer and chip-family would be enough. For instance I use Altera products, and I am very satisfied with the Cyclone family. I like MAX II as well, this comprises a flash gate-memory, a big advantage that after power-off it contains the last config, but for development is too slow, because flash programming needs more time. The Cyclone series doesn't have flash memory, if you intend to use your config later, you must use an additional IC, but for development is excellent, because the configuration is about 3 sec. Additionally it has a lot of built-in memory (ram), and it's very fast. and able to dual-port (Two addresses and two data ports, which can acces to the same memory at the same time). Furthermore it has several multiplication modul, with these you can save a lot of clock-pulse if you make a complex calculation.
 And my favourite, it has a differential output. Nowdays it is the best way to communicate with another IC in high-speed and without any disturbance. I could be endless writing about this theme, but unhappily I have to work tomorrow.

I am very happy that we speak the same technical language. Have you ever thought about visit Hungary, and speak with EP friends about this beautiful treasure we have?

Is there any news about your HDMI project?

No, I've not done any further work on the HDMI project since starting on the Enterprise RAM expansion. I'll get back to it one day.