Search found 637 matches

by IanB
Sun Nov 22, 2020 8:52 pm
Forum: for sale / freebies
Topic: For sale: RGBtoHDMI boards
Replies: 90
Views: 4561

Re: For sale: RGBtoHDMI boards

Before I spend hours designing a 3D printable case and distributing the STL, is there one available for download somewhere already please? Most people use the case from ebay linked in the wiki which just requires a few holes drilled using the supplied template and a slot cut in one end. See home pa...
by IanB
Sun Nov 22, 2020 3:31 am
Forum: for sale / freebies
Topic: For sale: RGBtoHDMI boards
Replies: 90
Views: 4561

Re: For sale: RGBtoHDMI boards

Just a reminder to check your PMs. (I haven't contacted everyone yet so don't be concerned if you haven't been contacted so far).
by IanB
Fri Nov 20, 2020 6:13 pm
Forum: 8-bit acorn hardware
Topic: RGB to HDMI using a Pi Zero and a small CPLD
Replies: 1273
Views: 105557

Re: RGB to HDMI using a Pi Zero and a small CPLD

I used my old profile from before the firmware update (and had to use the old monitor resolution file as it wasn't in the new firmware) but I did re-calibrate. Maybe something to do with that and I should start again from scratch with profiles? You must always install the new software on a blank mi...
by IanB
Fri Nov 20, 2020 2:27 pm
Forum: 8-bit acorn hardware
Topic: RGB to HDMI using a Pi Zero and a small CPLD
Replies: 1273
Views: 105557

Re: RGB to HDMI using a Pi Zero and a small CPLD

When the menu is on screen, the picture behind loses a lot of resolution. Is that normal? There shouldn't normally be any change when the menu is on screen other than the beeb output being dimmed. The only loss of resolution I'm aware of is if you are using the BBC NULA 12bpp Mode7 profile which wi...
by IanB
Thu Nov 19, 2020 1:01 pm
Forum: 8-bit acorn hardware
Topic: RGB to HDMI using a Pi Zero and a small CPLD
Replies: 1273
Views: 105557

Re: RGB to HDMI using a Pi Zero and a small CPLD

Profile is set to Commodore128 80 Col and pallet is RGBi. The image crisp and stable, however I am not sure of the colours are correct. The C128 profile was posted by another user and I don't have one so I've never tested it, however looking at it in more detail I can see that the main problem is t...
by IanB
Wed Nov 18, 2020 10:55 pm
Forum: 8-bit acorn hardware
Topic: RGB to HDMI using a Pi Zero and a small CPLD
Replies: 1273
Views: 105557

Re: RGB to HDMI using a Pi Zero and a small CPLD

I tried re-calibrating, and it went back to the setting I already had (offsets 2) which was better than any of the others. It only seems to affect the letter K, although I have noticed for a while that during the time it's actually drawing characters on (mode 7) screen whilst typing, the same effec...
by IanB
Mon Nov 16, 2020 10:49 am
Forum: for sale / freebies
Topic: For sale: RGBtoHDMI boards
Replies: 90
Views: 4561

Re: For sale: RGBtoHDMI boards

Just to confirm: I'm hoping to use it with a Commodore 128's 80-column RGBI interface — I think for this I just need an RGBtoHDMI board itself and no extra boards, is that right? Yes, you would need to make up a cable with a 12 way IDC plug on one end and a 9 way IDC D-type on the other (wires 1, 2...
by IanB
Mon Nov 16, 2020 10:44 am
Forum: for sale / freebies
Topic: For sale: RGBtoHDMI boards
Replies: 90
Views: 4561

Re: For sale: RGBtoHDMI boards

Sorry Ian, not sure if I need the 12bit extender for use with a BBC NuLA now. Re-reading your post it sounds like its only to bring the 12bit video out to an external connector. Can you confirm please. If not needed then take the extender off my order. Thanks. Yes you will need the 12 bit extender ...
by IanB
Mon Nov 16, 2020 1:46 am
Forum: for sale / freebies
Topic: For sale: RGBtoHDMI boards
Replies: 90
Views: 4561

Re: For sale: RGBtoHDMI boards

Ian, any ideas as to when and how we will get details for payment and shipment please? I keep checking what I think are my messages in this board but am not seeing anything. Maybe I’m looking in the wrong place for a PM. Should be in the next couple of days for kits. They will be going out first as...
by IanB
Mon Nov 16, 2020 1:39 am
Forum: for sale / freebies
Topic: For sale: RGBtoHDMI boards
Replies: 90
Views: 4561

Re: For sale: RGBtoHDMI boards

Any idea if this will work with Apple IIgs RGB? It is kind of CGA-like. It might work. I had a quick look at the schematic and it uses 12 bits per pixel similar to the Amiga but it also depends on the resolutions and pixel clock rates. The 12 bits are available internally so you would have to pick ...
by IanB
Sun Nov 15, 2020 7:35 pm
Forum: 8-bit acorn hardware
Topic: RGB to HDMI using a Pi Zero and a small CPLD
Replies: 1273
Views: 105557

Re: RGB to HDMI using a Pi Zero and a small CPLD

Mince wrote:
Sun Nov 15, 2020 12:38 pm
It defaults to 8x CPLD and changing it higher seems to make the picture worse for me.
Did you re-run the calibration after changing the multiplier?
by IanB
Sat Nov 14, 2020 12:58 am
Forum: 8-bit acorn hardware
Topic: RGB to HDMI using a Pi Zero and a small CPLD
Replies: 1273
Views: 105557

Re: RGB to HDMI using a Pi Zero and a small CPLD

There is a new software build available here: https://github.com/hoglet67/RGBtoHDMI/releases/tag/20201113_0471da6 Direct link: https://github.com/hoglet67/RGBtoHDMI/releases/download/20201113_0471da6/RGBtoHDMI_20201113_0471da6.zip This has various improvements including 12 bit per pixel support in t...
by IanB
Fri Nov 13, 2020 2:32 pm
Forum: for sale / freebies
Topic: For sale: RGBtoHDMI boards
Replies: 90
Views: 4561

Re: For sale: RGBtoHDMI boards

I've received a new batch of boards so will be sending them out over the next couple of weeks. These new boards are 12 bit capable so can be used with sources like Commodore Amiga, Atari ST and BBC NuLA however that means picking up the 12 digital bits internally from each of those sources so some s...
by IanB
Tue Nov 10, 2020 8:58 pm
Forum: 8-bit acorn hardware
Topic: RGB to HDMI using a Pi Zero and a small CPLD
Replies: 1273
Views: 105557

Re: RGB to HDMI using a Pi Zero and a small CPLD

In Mode 23 the VIDC outputs 4 bits at a time, and is then serialised externally with a 96MHz pixel clock. Yes, you are correct, I recalled it was 48Mhz instead of 96 Mhz. 96Mhz is too high to deserialise in the current design so, as you say, the 4 bits would have to be picked up in parallel with a ...
by IanB
Tue Nov 10, 2020 6:00 pm
Forum: 8-bit acorn hardware
Topic: RGB to HDMI using a Pi Zero and a small CPLD
Replies: 1273
Views: 105557

Re: RGB to HDMI using a Pi Zero and a small CPLD

Would a dedicated version that supports the A4xx/A540 hi-res mono mode be possible? (I guess) It would need to pick up the signals internally, before the serializer. In theory it should already work as I've added 1 bit per pixel and extra multiplier options to the latest CPLD. It works with the hir...
by IanB
Fri Nov 06, 2020 9:32 am
Forum: 8-bit acorn hardware
Topic: RGB to HDMI using a Pi Zero and a small CPLD
Replies: 1273
Views: 105557

Re: RGB to HDMI using a Pi Zero and a small CPLD

OK. I tested with two different cards. One was a standard CGA card. The other was an EGA card with the dip switches set to CGA mode. See screen caps below. Thanks for these, you can clearly see a phase difference between CGA text and graphics but it looks to be around 45 - 90 degrees, not 180 as I ...
by IanB
Fri Nov 06, 2020 12:23 am
Forum: 8-bit acorn hardware
Topic: RGB to HDMI using a Pi Zero and a small CPLD
Replies: 1273
Views: 105557

Re: RGB to HDMI using a Pi Zero and a small CPLD

Pepperm wrote:
Thu Nov 05, 2020 10:48 pm
Sorry to invade this thread but how do I get my hands on an RGB to HDMI adaptor please?
You just post in the for sale thread to reserve one and you will be contacted via PM when some more are available probably in the next week or so.
by IanB
Fri Nov 06, 2020 12:12 am
Forum: for sale / freebies
Topic: For sale: RGBtoHDMI boards
Replies: 90
Views: 4561

Re: For sale: RGBtoHDMI boards

Pepperm wrote:
Thu Nov 05, 2020 10:37 pm
How do I get my hands on an RGB to HDMI adaptor please? I see that there are some for sale in Australia but I am in the UK...
Just post in this thread as you have already done, you will be contacted by PM when some new boards are available probably in the next week or so.
by IanB
Fri Oct 30, 2020 11:51 pm
Forum: 8-bit acorn hardware
Topic: RGB to HDMI using a Pi Zero and a small CPLD
Replies: 1273
Views: 105557

Re: RGB to HDMI using a Pi Zero and a small CPLD

Also, I plan on testing out an EGA card and on a Tandy 1000. Will this board handle Tandy 1000 special graphics mode? I didn't see a preset for it. It should work on the Tandy 1000 which has a CGA style interface but can send out all 16 colours simultaneously. I haven't got one so again it hasn't b...
by IanB
Fri Oct 30, 2020 11:05 am
Forum: 8-bit acorn hardware
Topic: RGB to HDMI using a Pi Zero and a small CPLD
Replies: 1273
Views: 105557

Re: RGB to HDMI using a Pi Zero and a small CPLD

I can do if you still want them. However, I found that increasing the sampling phase from 0 to 1 fixed the issue. Here is a video of what I was seeing. It seems the default config for PC has sampling phase set to 0. Perhaps I am masking the real problem by doing this. Not sure. https://youtu.be/plS...
by IanB
Fri Oct 30, 2020 4:19 am
Forum: 8-bit acorn hardware
Topic: RGB to HDMI using a Pi Zero and a small CPLD
Replies: 1273
Views: 105557

Re: RGB to HDMI using a Pi Zero and a small CPLD

I built up a 6bit board and I am testing it out on an IBM PC 5150 with a CGA card. It seems to work fine until I start up a game and then the display is slightly wavy. In some games (Burger Time) the colors are missing. Has anyone seen this before? Do I need to change any settings for various CGA m...
by IanB
Wed Oct 28, 2020 5:44 pm
Forum: for sale / freebies
Topic: For sale: RGBtoHDMI boards
Replies: 90
Views: 4561

Re: For sale: RGBtoHDMI boards

DaveLecky wrote:
Mon Oct 26, 2020 11:18 am
Can you remind us of the price please, it’s been removed from post 1.
It should be around £30 for the built ones and a few pounds less for the kit ones as most of the parts are already fitted on this new 12 bit batch but I haven't finalised things yet.
by IanB
Wed Oct 28, 2020 4:03 pm
Forum: 8-bit acorn hardware
Topic: Problems trying to use an HP LP2065 monitor with a Master
Replies: 17
Views: 508

Re: Problems trying to use an HP LP2065 monitor with a Master

That's all fine. Very good value, in fact, I'd say. Just to be clear… this should work with the HDMI-to-DVI cable that I've already got; correct? The Pi zero uses mini HDMI so you will need a mini HDMI to HDMI adapter like this: https://www.ebay.co.uk/itm/Gold-Plated-Standard-HDMI-Female-to-Type-C-...
by IanB
Tue Oct 27, 2020 12:57 am
Forum: 8-bit acorn hardware
Topic: Problems trying to use an HP LP2065 monitor with a Master
Replies: 17
Views: 508

Re: Problems trying to use an HP LP2065 monitor with a Master

It also strikes me as slightly odd that the odd frame does get through DVI to the monitor, in that I've seen brief glimpses of the BBC display on it. That sort of adds insult to injury – to be so close to working! It's probably the equivalent of sending an analog video signal to a CRT monitor witho...
by IanB
Sun Oct 25, 2020 11:55 pm
Forum: for sale / freebies
Topic: For sale: RGBtoHDMI boards
Replies: 90
Views: 4561

Re: For sale: RGBtoHDMI boards

FYI I've ordered another batch of boards which should be available in a couple of weeks or so. Also I've noticed that there are two different versions of the case and one is not really suitable for use with RGBtoHDMI. This is the correct one: https://www.ebay.co.uk/itm/1Pcs-Black-Plastic-Protective-...
by IanB
Sun Oct 25, 2020 10:51 pm
Forum: 8-bit acorn hardware
Topic: Problems trying to use an HP LP2065 monitor with a Master
Replies: 17
Views: 508

Re: Problems trying to use an HP LP2065 monitor with a Master

Hopefully IanB will be along shortly. I think he has a HP2065 monitor as well. I have 12 of them :lol: He also has one of the devices I have a metal cased Scart to HDMI converter which appears to be the same type as the CJE one and a similar but plastic cased one, both bought from ebay many years a...
by IanB
Sat Oct 17, 2020 3:56 am
Forum: 8-bit acorn hardware
Topic: RGB to HDMI using a Pi Zero and a small CPLD
Replies: 1273
Views: 105557

Re: RGB to HDMI using a Pi Zero and a small CPLD

The reason I upgraded is because I was getting twinkling on certain mode 7 characters. Unfortunately, this still exists on the 6 bit board. It is most noticeable with the letters 0, A, K, M, N & m although other letters will occasionally twinkle. All other modes work perfectly. Is there anything I ...
by IanB
Tue Oct 13, 2020 8:42 pm
Forum: 8-bit acorn hardware
Topic: RGB to HDMI using a Pi Zero and a small CPLD
Replies: 1273
Views: 105557

Re: RGB to HDMI using a Pi Zero and a small CPLD

I've just tried out the new build and I get a blank screen on boot. I am using an old Samsung LE19R88 with a reported screen resolution of 1440x900 which I see is not listed in the supported resolutions - I guess because it's non-standard. Thanks for posting your EDID file. It indicates 50Hz suppor...
by IanB
Sun Oct 11, 2020 8:07 pm
Forum: 8-bit acorn hardware
Topic: RGB to HDMI using a Pi Zero and a small CPLD
Replies: 1273
Views: 105557

Re: RGB to HDMI using a Pi Zero and a small CPLD

Since now tested only BBC Cpld, it works but in my small 9" test monitor it sets the maximum supported resolution (1920x1080), that is not the native res (1024x600), so the result it's scaled. It's normal? i attach log and edid, if useful. Yes, it's normal as the EDID you posted doesn't even includ...
by IanB
Sun Oct 11, 2020 8:01 pm
Forum: 8-bit acorn hardware
Topic: RGB to HDMI using a Pi Zero and a small CPLD
Replies: 1273
Views: 105557

Re: RGB to HDMI using a Pi Zero and a small CPLD

RGB was a bit more of a fiddle as Scaling seemed to create a 1Hz screen blanking effect on all apart from Integer Sharp. The 1Hz effect it the system reinitialising the profile because the timing was out of range which can indicate something is set incorrectly in the geometry menu. Try adjusting th...

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