Search found 466 matches

by IanB
Wed Apr 01, 2020 5:51 pm
Forum: hardware
Topic: RGB to HDMI using a Pi Zero and a small CPLD
Replies: 979
Views: 56767

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

Still not got model numbers, but my old RGB2HDMI doesn't seem to be working, so maybe there is an issue with the three HDMI cables that I have tried! Are you using a mini HDMI to HDMI cable or an adapter with a normal cable? I have found some adapters with some cable and monitor combinations result...
by IanB
Tue Mar 31, 2020 2:45 pm
Forum: hardware
Topic: RGB to HDMI using a Pi Zero and a small CPLD
Replies: 979
Views: 56767

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

I still can't get anything that matches the DVD screen captures in Mode 7 that I've been using for years. You won't because the Mode 7 pixels aren't square and the current screengrab code only handles square pixels. You will either get something that is a bit too narrow (Uneven scaling) or a bit to...
by IanB
Tue Mar 31, 2020 1:38 pm
Forum: hardware
Topic: RGB to HDMI using a Pi Zero and a small CPLD
Replies: 979
Views: 56767

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

I'm agog - what software change brings this troublesome SD card back into play? It was a total kludge. From previous logs, Beebmaster was getting: Sat,21 Mar 2020.20:29:56.595247 Initialised Framebuffer Sat,21 Mar 2020.20:29:56.595379 Size: 1920x8192 Sat,21 Mar 2020.20:29:56.595425 Pitch: 1920 byte...
by IanB
Mon Mar 30, 2020 8:30 pm
Forum: hardware
Topic: RGB to HDMI using a Pi Zero and a small CPLD
Replies: 979
Views: 56767

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

Also I've noticed that because I use *TV 255 to fix the picture on my Sony Trinitron TV of universal ABug acclaim (well, 3 different people said they liked it) the bottom pixel row is missed off the screen: You would get a few pixels clipped with *TV255 on a 1080p screen as it won't fit, however if...
by IanB
Fri Mar 27, 2020 3:01 pm
Forum: hardware
Topic: RGB to HDMI using a Pi Zero and a small CPLD
Replies: 979
Views: 56767

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

I'm using the BBC Micro v21-v23 profile, and I set H Offset to 100 (I think it was set at 126 by default). If the offered profiles have versions, you are still stuck in legacy mode with a very old CPLD version. The IntegraB board doesn't touch the video hardware. I think it's the IBOS (IntegraB OS)...
by IanB
Fri Mar 27, 2020 12:38 pm
Forum: hardware
Topic: RGB to HDMI using a Pi Zero and a small CPLD
Replies: 979
Views: 56767

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

CPLD Version: Legacy_3BIT v1.0 That CPLD is very old but it should work with the "BBC Micro V10-V20" profile (There are several different profiles in legacy mode for different CPLDs prior to v3 so you need to make sure you have selected the one to match your CPLD) I'll modify the board this afterno...
by IanB
Fri Mar 27, 2020 11:01 am
Forum: hardware
Topic: RGB to HDMI using a Pi Zero and a small CPLD
Replies: 979
Views: 56767

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

Any idea why my BBC Micro with IntegraB might be doing this clipping (in Mode 7 only)? Resolution is set to 1920x1080 50Hz to match TV resolution. That usually indicates a mismatch between the software profile and the CPLD version What software release are you using? What CPLD version is programmed...
by IanB
Mon Mar 23, 2020 9:24 pm
Forum: hardware
Topic: RGB to HDMI using a Pi Zero and a small CPLD
Replies: 979
Views: 56767

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

With this 8GB card, I get the first tranche of output commencing with ***RESET*** at power-on (up until the next ***RESET*** where I've had to press the button) so it's doing something. Can you try the attached file with the problem 8GB SD card to see if it makes any difference: kernelrpi.zip Unzip...
by IanB
Mon Mar 23, 2020 11:30 am
Forum: off-topic
Topic: Isolating myself - for three months !!!!!!!!!!!
Replies: 33
Views: 1386

Re: Isolating myself - for three months !!!!!!!!!!!

I'm doing pretty much the same. I caught swine flu 10 years ago and ended up in hospital for two months, half that time on life support with sepsis and multiple organ failure so I know what the worst hit are going through. That left me with some permanent health issues so I don't think I'd stand muc...
by IanB
Sun Mar 22, 2020 9:04 pm
Forum: hardware
Topic: RGB to HDMI using a Pi Zero and a small CPLD
Replies: 979
Views: 56767

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

I just rushed those captures out to show it was working, but I've set 50Hz now and a few other things. The image frame is very wide, 960 pixels in modes 0 and 1 so there are "vertical black bars" on either side of the picture, can I reduce that a bit? ... I'm going to start using it for my screen c...
by IanB
Sun Mar 22, 2020 5:19 pm
Forum: hardware
Topic: RGB to HDMI using a Pi Zero and a small CPLD
Replies: 979
Views: 56767

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

This is a picture after I took away the short between pins 1 & 2 with solder braid, although it does look like pin 1 has lifted a bit, but it is connected and it works. I think you can see the short in earlier pictures I posted. Looks good. Don't forget to select a 50Hz resolution. BTW if you want ...
by IanB
Sun Mar 22, 2020 4:16 pm
Forum: hardware
Topic: RGB to HDMI using a Pi Zero and a small CPLD
Replies: 979
Views: 56767

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

I think it's looking for that file in "Profiles/Legacy_3BIT/Colour Test" but that exact file "profile_Legacy_3BIT.txt" doesn't exist anywhere in the zip. I get the same error on the working 16GB card. That's perfectly normal, it will only be created on the SD card if you start changing the profile ...
by IanB
Sun Mar 22, 2020 4:14 pm
Forum: hardware
Topic: RGB to HDMI using a Pi Zero and a small CPLD
Replies: 979
Views: 56767

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

And what happens at power on: Sun,22 Mar 2020.15:45:16.999686 Read resolution: Default@60Hz Sun,22 Mar 2020.15:45:17.299120 Initialised Framebuffer Sun,22 Mar 2020.15:45:17.299258 Size: 1920x8192 Sun,22 Mar 2020.15:45:17.299308 Pitch: 1920 bytes Nothing else happens unless I press reset to wake it ...
by IanB
Sun Mar 22, 2020 4:02 pm
Forum: hardware
Topic: RGB to HDMI using a Pi Zero and a small CPLD
Replies: 979
Views: 56767

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

For some reason, it's failing to read the profile: Sun,22 Mar 2020.15:45:17.059998 Loading file /profile_Legacy_3BIT.txt Sun,22 Mar 2020.15:45:17.060040 WARN: Failed to open /profile_Legacy_3BIT.txt (result = 4) I've never seen this happen before - it does suggest an SD Card issue. Dave "profile_Le...
by IanB
Sun Mar 22, 2020 3:59 pm
Forum: hardware
Topic: RGB to HDMI using a Pi Zero and a small CPLD
Replies: 979
Views: 56767

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

BeebMaster wrote:
Sun Mar 22, 2020 3:33 pm
Incidentally...can I connect the debug wires directly to the GPIO pins on the Pi 4 and save myself a USB slot?
That should be possible, make sure you have:

Code: Select all

enable_uart=1
in your config.txt on the pi 4 which enables the mini uart
by IanB
Sun Mar 22, 2020 10:52 am
Forum: hardware
Topic: RGB to HDMI using a Pi Zero and a small CPLD
Replies: 979
Views: 56767

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

I was suspicious of it even before you said anything because I noticed as soon as I opened it that the Kingston logo doesn't look right. For reference in the middle of the picture is another (32GB) Kingston card. The 8GB card's logo doesn't look typeset correctly, or maybe they didn't bold the font...
by IanB
Sat Mar 21, 2020 10:37 pm
Forum: hardware
Topic: RGB to HDMI using a Pi Zero and a small CPLD
Replies: 979
Views: 56767

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

then I did HDMI calibration (genlock failed) and auto calibration: Sat,21 Mar 2020.20:40:47.805393 Read resolution: Default@60Hz You haven't selected a 50 Hz resolution so genlock will fail Sat,21 Mar 2020.20:29:56.595247 Initialised Framebuffer Sat,21 Mar 2020.20:29:56.595379 Size: 1920x8192 Sat,2...
by IanB
Sat Mar 21, 2020 8:04 pm
Forum: hardware
Topic: RGB to HDMI using a Pi Zero and a small CPLD
Replies: 979
Views: 56767

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

There's no output to the screen at all, as in the "no signal" message stays on screen and it eventually goes into standby. I'm going to try different cables to rule that out. That sounds like it isn't even starting the Pi code. I've got a serial to USB adapter I use for BeebSCSI debugging, I think ...
by IanB
Sat Mar 21, 2020 3:50 pm
Forum: hardware
Topic: RGB to HDMI using a Pi Zero and a small CPLD
Replies: 979
Views: 56767

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

That last part is probably beyond my powers, but before having done anything yet, things have taken a turn for the worst. Now when I switch on the Beeb, D1 and D2 come on with low brightness, then D1 goes off completely, D2 goes to its usual retina-destroying intensity, flicks after a moment, and s...
by IanB
Fri Mar 20, 2020 12:01 am
Forum: for sale / freebies
Topic: FS: Raspberry Pi to 1MHz bus interface
Replies: 26
Views: 962

Re: FS: Raspberry Pi to 1MHz bus interface

Code: Select all

IanB		2	2
Just to add that all of mine should be Underside
by IanB
Thu Mar 19, 2020 3:12 am
Forum: hardware
Topic: RGB to HDMI using a Pi Zero and a small CPLD
Replies: 979
Views: 56767

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

thanks Ian, it worked, and i got a perfect pixeling with native monitor's resolution and integer/sharp scaling! That's great, lets see some photos then :D I abandoned the zx81 tuning too, after hours of tests and trimmering i didn't get good result, so i'll continue using the Zx-Vid composite mod, ...
by IanB
Wed Mar 18, 2020 9:45 pm
Forum: hardware
Topic: RGB to HDMI using a Pi Zero and a small CPLD
Replies: 979
Views: 56767

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

I've been trying to get my RGB to HDMI working correctly, it's one of the Judge's boards from the January ABug. The picture is far from perfect, as shown in these mode 7 and mode 0 screen captures: Zooming in on the mode 0 image shows every fourth column is yellow instead of white which means that ...
by IanB
Mon Mar 16, 2020 9:48 pm
Forum: hardware
Topic: RGB to HDMI using a Pi Zero and a small CPLD
Replies: 979
Views: 56767

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

But, before, i'd like to get the right geometry for my zx81 with the external circuitry and the RGB6bit board... The ZX80 profile included in the TTL profiles should work and you will need to set the resolution to 1024x600 as well. You might have to short out the resistors on one side of the potent...
by IanB
Mon Mar 16, 2020 8:52 pm
Forum: hardware
Topic: RGB to HDMI using a Pi Zero and a small CPLD
Replies: 979
Views: 56767

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

Sorry Ian, my fault! it's not a 9" the monitor as i wrote, but a 10,1", and the max resolution is 1920x1980@60 (and i usually use 1920x1080@50 with RGBtoHD). OK that's good news, the resolution of your lcd is 1024x600 which is a good resolution for RGBtoHD as I mentioned above, (the native resoluti...
by IanB
Mon Mar 16, 2020 5:11 pm
Forum: hardware
Topic: RGB to HDMI using a Pi Zero and a small CPLD
Replies: 979
Views: 56767

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

But I took the (bad) photos on my 9-inch monitor only to compare the obvious difference between RGBtoHD I had a look on ebay at 9" widescreen monitors and they were mostly 800x480 native resolution with some at 1024x600 resolution. The current RC7 doesn't support 800x480 although I have now added t...
by IanB
Sun Mar 15, 2020 4:00 pm
Forum: hardware
Topic: RGB to HDMI using a Pi Zero and a small CPLD
Replies: 979
Views: 56767

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

i tested RGBtoHD with the ZX+2, and compared the quality with the ZX-HD by Bytedelight i bought some months ago for more than 70 euros... Thanks for the screenshots, however the RGB to HD output should look even better than that! Here is an off screen photo of my ZX spectrum+3: spectrum.jpg As you ...
by IanB
Sat Mar 14, 2020 1:16 pm
Forum: hardware
Topic: RGB to HDMI using a Pi Zero and a small CPLD
Replies: 979
Views: 56767

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

aotta wrote:
Sat Mar 14, 2020 12:56 pm
One more (and maybe stupid) question: the ZX81 YUV connection you explained above, does it need the logic board plugin and, in case, a specific Issue?
Yes it needs the analog board plugged in and you connect the ZX81 signals to the analog board. Issue 2 or Issue 3 analog board will work.
by IanB
Sat Mar 14, 2020 12:39 pm
Forum: hardware
Topic: RGB to HDMI using a Pi Zero and a small CPLD
Replies: 979
Views: 56767

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

Here's the profiles i made: Commodore_128-80col.txt Thanks I'd like to use RGBtoHD with my ZX81 too, but i didn't understand if the "splitter" board posted some pages ago is still needed or not. Can you give some more info about it? No, you don't need anything else. You program the YUV CPLD (via th...
by IanB
Fri Mar 13, 2020 11:59 pm
Forum: hardware
Topic: RGB to HDMI using a Pi Zero and a small CPLD
Replies: 979
Views: 56767

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

I used a custom profile and changed only the Sync mode (from composite to separate V+H), the size and the offset of the screen. I didn't know i could rename it and adding to predefinite profiles, good news! Post the file once you have renamed it and I'll add it to the default profiles on any future...
by IanB
Fri Mar 13, 2020 11:06 pm
Forum: hardware
Topic: RGB to HDMI using a Pi Zero and a small CPLD
Replies: 979
Views: 56767

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

Waiting for components for the analog board, i'm playing with new profiles for the 6bit board.. probably not so useful, but for informing all, it works at first launch with the Commodore 128 80 columns port! That's another computer to add to the supported list (well half of one!) Did you just use t...