Amiga Digital Video HDMI for the A500 and A600 - Page 5

bloodmosher · 12 February 2021, 04:17

Quote:

Originally Posted by jasonsbeer

Just thinking out loud...it should be possible to make this in a video card form factor for big box Amigas. A drop in solution like this would be intriguing.

Yes, this is possible! Check it out:
https://github.com/Bloodmosher/Amiga...Slot-RGBtoHDMI

alexh · 12 February 2021, 10:49

Quote:

Originally Posted by bloodmosher

Yes, this is possible! Check it out:
https://github.com/Bloodmosher/Amiga...Slot-RGBtoHDMI

Shame there are no schematic or layout files in this repo

Ah, no they are here

https://github.com/hoglet67/RGBtoHDM...r/VideoSlot/V1

spudje · 12 February 2021, 11:42

I have a v1 installed in an A500. What an awesome little gem this is! I do see weird blue dots flickering in Kick Off 2 Final Whistle. Anyone else has similar artefacts?

seb132 · 12 February 2021, 12:23

It seems that German engineering is redesigning the adapter to fit better in A500... more to come.

jasonsbeer · 13 February 2021, 00:18

Quote:

Originally Posted by bloodmosher

Yes, this is possible! Check it out:
https://github.com/Bloodmosher/Amiga...Slot-RGBtoHDMI

.

Meh. Why use surface mount when you have an entire card to work with? I'm drawing my own with through hole components.

MrClump · 01 March 2021, 21:49

I have one of these to assemble, but nowhere seems to have U4 (TLV74333PDBVR) in stock. Is there an alternative part I can use?

MrClump · 01 March 2021, 21:55

Quote:

Originally Posted by MrClump

I have one of these to assemble, but nowhere seems to have U4 (TLV74333PDBVR) in stock. Is there an alternative part I can use?

Found some alternatives.

https://github.com/c0pperdragon/Amig...ideo/issues/29

kipper2k · 01 March 2021, 23:55

You do not actually need U4. You can use the 3.3v generated by the Pi so it is not needed. i released the Gerber files for the A600 on the Github page, tested and works good and is "relatively" easy to solder. I did up a design that will fit in the a500, a1k and a2k. and will release them after a good testing.

https://github.com/c0pperdragon/Amig...ideo/issues/37

I do have a few of these left over so if anyone wants blank or premade let me know. It is too expensive to ship to Europe so probably only good for those people living in N. America.

eXeler0 · 02 March 2021, 21:16

Quote:

Originally Posted by kipper2k

You do not actually need U4. You can use the 3.3v generated by the Pi so it is not needed. i released the Gerber files for the A600 on the Github page, tested and works good and is "relatively" easy to solder. I did up a design that will fit in the a500, a1k and a2k. and will release them after a good testing.

https://github.com/c0pperdragon/Amig...ideo/issues/37

I do have a few of these left over so if anyone wants blank or premade let me know. It is too expensive to ship to Europe so probably only good for those people living in N. America.

Wow, looks pretty neat. Cudos for designing it so perfectly around all the nearby chips that almost get in the way.

kipper2k · 02 March 2021, 22:30

Thanks for the kind words. I think i have figured out how do slightly modify so there will be no need for the end user to to any soldering

Will take a week to test etc providing i don't get distracted

seb132 · 03 March 2021, 04:41

Bloody interesting news, keeper2k.
Very curious about your new great solutions here!

marmazzaa · 09 April 2021, 11:30

Hello All, any thoughts why my Rpi HDMI output looks like this:
https://www.dropbox.com/s/o5k97524al...ture2.png?dl=0

(Amiga test kit screen visible on composite A500 out)

solarmon · 09 April 2021, 11:37

What RGBtoHDMI have you got? What Denise version - have you set the jumper set correctly, if you've got the v2 board.

It looks like there is interference with the sync signal - so check that signal and pins are OK on the RGBtoHDMI board.

marmazzaa · 09 April 2021, 11:54

I have Jumper set to Denise (8362 chip on board), adapter PCB V2 version. Picture is flickering and splitted in 4 as you see. Tried to play with Rpi prefs menu but with no luck.
I soldered 74HC86PW instead 74LVC86, can this be fault?

solarmon · 09 April 2021, 12:08

Quote:

Originally Posted by marmazzaa

I soldered 74HC86PW instead 74LVC86, can this be fault?

I think you are meant to use 'HCT' parts (instead of 'HC'), which are are TTL logic compatible. This is possibly why you are having this issue.

However, for the VLC parts alternative, I have used VHC parts instead, which are slower and fixed some pixel sparkles issues that I had.

hooverphonique · 09 April 2021, 13:39

HC aren't 5V tolerant when powered from 3,3V.
HCT are TTL compatible, but must be powered from ~5V, so they won't work either.
Additionally, HC(T) are much slower than LVC - how much of a role that plays with your issue, I'm not sure.

Use LVC, VHC or AHC parts - the latter two may work better when using ribbon cables or adapter pcb's (they have limited output drive which reduces reflections on long traces).

marmazzaa · 13 April 2021, 19:21

Okay, I replaced 74HC86PW with 74LVC86. Now it works, but quality is not great.

I got strange purple shadows:
https://www.dropbox.com/s/hyivydotms...ture9.png?dl=0

solarmon · 13 April 2021, 20:32

Have you set the jumper to Denise?

Also, make sure you clean all the flux off. Using a multimeter, if you measure resistance to ground, do you get any readings on any of the Denise header pins?

moritzmm · 14 April 2021, 19:38

Hi All
I have also managed to fabricate an RGBtoHDMI, and I'm very pleased with it.

I have made a little cover that holds an HDMI output connector. It is designed in such a way that it just clips on the A500 without the need to modify the case in any way.

If it has any interest I made it publicly available to download the STL from Prusaprints

https://www.prusaprinters.org/prints...-for-amiga-500

Regards

solarmon · 14 April 2021, 19:49

Quote:

Originally Posted by moritzmm

Hi All
I have also managed to fabricate an RGBtoHDMI, and I'm very pleased with it.

I have made a little cover that holds an HDMI output connector. It is designed in such a way that it just clips on the A500 without the need to modify the case in any way.

If it has any interest I made it publicly available to download the STL from Prusaprints

https://www.prusaprinters.org/prints...-for-amiga-500

Regards

Excellent work! That is a very neat solution! Thank you for sharing!

01 March 2021, 23:55	#88
kipper2k Registered User Join Date: Sep 2006 Location: Thunder Bay, Canada Posts: 4,323	You do not actually need U4. You can use the 3.3v generated by the Pi so it is not needed. i released the Gerber files for the A600 on the Github page, tested and works good and is "relatively" easy to solder. I did up a design that will fit in the a500, a1k and a2k. and will release them after a good testing. https://github.com/c0pperdragon/Amig...ideo/issues/37 I do have a few of these left over so if anyone wants blank or premade let me know. It is too expensive to ship to Europe so probably only good for those people living in N. America. Last edited by kipper2k; 02 March 2021 at 00:16.

03 March 2021, 04:41	#91
seb132 French in Australia Join Date: May 2012 Location: Gold Coast Age: 52 Posts: 507	Amiga Digital Video HDMI for the A500 and A600 Bloody interesting news, keeper2k. Very curious about your new great solutions here! Last edited by seb132; 03 March 2021 at 16:54.

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12 February 2021, 11:42	#83
spudje Registered User Join Date: Dec 2014 Location: Netherlands Posts: 1,406	I have a v1 installed in an A500. What an awesome little gem this is! I do see weird blue dots flickering in Kick Off 2 Final Whistle. Anyone else has similar artefacts?

12 February 2021, 12:23	#84
seb132 French in Australia Join Date: May 2012 Location: Gold Coast Age: 52 Posts: 507	It seems that German engineering is redesigning the adapter to fit better in A500... more to come.

01 March 2021, 21:49	#86
MrClump Registered User Join Date: Aug 2020 Location: Torquay Posts: 166	I have one of these to assemble, but nowhere seems to have U4 (TLV74333PDBVR) in stock. Is there an alternative part I can use?

02 March 2021, 22:30	#90
kipper2k Registered User Join Date: Sep 2006 Location: Thunder Bay, Canada Posts: 4,323	Thanks for the kind words. I think i have figured out how do slightly modify so there will be no need for the end user to to any soldering Will take a week to test etc providing i don't get distracted

09 April 2021, 11:30	#92
marmazzaa Registered User Join Date: Jan 2021 Location: PL Posts: 6	Hello All, any thoughts why my Rpi HDMI output looks like this: https://www.dropbox.com/s/o5k97524al...ture2.png?dl=0 (Amiga test kit screen visible on composite A500 out)

09 April 2021, 11:37	#93
solarmon Registered User Join Date: Dec 2018 Location: UK Posts: 1,715	What RGBtoHDMI have you got? What Denise version - have you set the jumper set correctly, if you've got the v2 board. It looks like there is interference with the sync signal - so check that signal and pins are OK on the RGBtoHDMI board.

09 April 2021, 11:54	#94
marmazzaa Registered User Join Date: Jan 2021 Location: PL Posts: 6	I have Jumper set to Denise (8362 chip on board), adapter PCB V2 version. Picture is flickering and splitted in 4 as you see. Tried to play with Rpi prefs menu but with no luck. I soldered 74HC86PW instead 74LVC86, can this be fault?

09 April 2021, 13:39	#96
hooverphonique ex. demoscener "Bigmama" Join Date: Jun 2012 Location: Fyn / Denmark Posts: 1,624	HC aren't 5V tolerant when powered from 3,3V. HCT are TTL compatible, but must be powered from ~5V, so they won't work either. Additionally, HC(T) are much slower than LVC - how much of a role that plays with your issue, I'm not sure. Use LVC, VHC or AHC parts - the latter two may work better when using ribbon cables or adapter pcb's (they have limited output drive which reduces reflections on long traces).

13 April 2021, 19:21	#97
marmazzaa Registered User Join Date: Jan 2021 Location: PL Posts: 6	Okay, I replaced 74HC86PW with 74LVC86. Now it works, but quality is not great. I got strange purple shadows: https://www.dropbox.com/s/hyivydotms...ture9.png?dl=0

13 April 2021, 20:32	#98
solarmon Registered User Join Date: Dec 2018 Location: UK Posts: 1,715	Have you set the jumper to Denise? Also, make sure you clean all the flux off. Using a multimeter, if you measure resistance to ground, do you get any readings on any of the Denise header pins?

14 April 2021, 19:38	#99
moritzmm Registered User Join Date: Nov 2018 Location: København Ø / Denmark Posts: 6	Hi All I have also managed to fabricate an RGBtoHDMI, and I'm very pleased with it. I have made a little cover that holds an HDMI output connector. It is designed in such a way that it just clips on the A500 without the need to modify the case in any way. If it has any interest I made it publicly available to download the STL from Prusaprints https://www.prusaprinters.org/prints...-for-amiga-500 Regards

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