Search found 3054 matches

by BeebMaster
Sun Mar 29, 2020 11:28 pm
Forum: general
Topic: Wikipedia articles on Econet and DFS [citation needed]
Replies: 4
Views: 238

Re: Wikipedia articles on Econet and DFS [citation needed]

Barson Computers produced what I think is the only known Econet interface for the Electron: http://www.beebmaster.co.uk/Econet/ElkNet.html It's also possible that they produced an unbranded Master-type Econet module seen in Australia: http://www.beebmaster.co.uk/Econet/UnNet.html Barson also had the...
by BeebMaster
Fri Mar 27, 2020 8:54 pm
Forum: hardware
Topic: RGB to HDMI using a Pi Zero and a small CPLD
Replies: 955
Views: 55875

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

I found that mode 7 was being clipped on the left during some of the experimentation I was doing, but cycling through the TV ratio options until it got back round to 4:3 fixed it. I think the mode 7 picture I posted above looks a bit stretched horizontally, I've been trying with uneven Teletext pixe...
by BeebMaster
Mon Mar 23, 2020 11:30 pm
Forum: hardware
Topic: RGB to HDMI using a Pi Zero and a small CPLD
Replies: 955
Views: 55875

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

I think it looks best at 1600x1200 with scaling on, although I'm still experimenting.
capture23.png
capture24.png
capture25.png
by BeebMaster
Mon Mar 23, 2020 11:08 pm
Forum: hardware
Topic: RGB to HDMI using a Pi Zero and a small CPLD
Replies: 955
Views: 55875

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

No sorry, same thing: nothing happens till reset is pressed. Shall I rig up a debug?
by BeebMaster
Sun Mar 22, 2020 9:21 pm
Forum: hardware
Topic: RGB to HDMI using a Pi Zero and a small CPLD
Replies: 955
Views: 55875

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

I'll have a play about with resolutions etc. Cutting off the black bars would be handy, I wonder if it's possible I could set up some sort of batch auto-crop with ffmpeg or convert or something if I get really stuck and need to process a whole load of captures, I haven't looked into that yet. I was ...
by BeebMaster
Sun Mar 22, 2020 9:08 pm
Forum: hardware
Topic: Acorn Communicator - Schematics or Service manual?
Replies: 2
Views: 192

Re: Acorn Communicator - Schematics or Service manual?

Not exactly, but some other things which may add very slightly to our collective knowledge of the Communicator. At the ABug in January we were discussing (well, I was, with anyone who was listening) the "Master" and "Communicator" versions of FileStores, and that my FileStore E20 is Communicator col...
by BeebMaster
Sun Mar 22, 2020 5:53 pm
Forum: hardware
Topic: RGB to HDMI using a Pi Zero and a small CPLD
Replies: 955
Views: 55875

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

Thanks to everyone who helped me fix it! 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 had t...
by BeebMaster
Sun Mar 22, 2020 5:10 pm
Forum: hardware
Topic: RGB to HDMI using a Pi Zero and a small CPLD
Replies: 955
Views: 55875

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.
RGBtoHDMI3.jpg
by BeebMaster
Sun Mar 22, 2020 4:56 pm
Forum: hardware
Topic: RGB to HDMI using a Pi Zero and a small CPLD
Replies: 955
Views: 55875

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

Fabrique Belgique!!!!!!!!!!!!
capture3.png
capture2.png
capture4.png
by BeebMaster
Sun Mar 22, 2020 4:42 pm
Forum: hardware
Topic: RGB to HDMI using a Pi Zero and a small CPLD
Replies: 955
Views: 55875

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

Right. The short answer is, a short.

Pins 1 & 2 are shorted, I get 0 resistance between them. Pin 1 to GPIO 13 is 0 ohm, Pin 2 to GPIO 6 is 0 ohm, which is correct but also Pin 1 to GPIO 6 and Pin 2 to GPIO 13 each give me 0 ohm as well. So I need to unshort those two pins.
by BeebMaster
Sun Mar 22, 2020 4:14 pm
Forum: hardware
Topic: RGB to HDMI using a Pi Zero and a small CPLD
Replies: 955
Views: 55875

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

I've started again with another card, 16GB TDK card this time (which has a 4MB unformatted space at the start) and it boots fine and I get a screen image. So for the nonce I'm going to declare the Kingston 8GB card a rogue card, which means I potentially got 9 other rogues as well! Back to continuit...
by BeebMaster
Sun Mar 22, 2020 4:07 pm
Forum: hardware
Topic: RGB to HDMI using a Pi Zero and a small CPLD
Replies: 955
Views: 55875

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 I think it'...
by BeebMaster
Sun Mar 22, 2020 3:49 pm
Forum: hardware
Topic: RGB to HDMI using a Pi Zero and a small CPLD
Replies: 955
Views: 55875

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

None of that has helped. Here's the reformatted card: sudo fdisk -l /dev/sde Disk /dev/sde: 7.2 GiB, 7744782336 bytes, 15126528 sectors Disk model: Multi-Reader -3 Units: sectors of 1 * 512 = 512 bytes Sector size (logical/physical): 512 bytes / 512 bytes I/O size (minimum/optimal): 512 bytes / 512 ...
by BeebMaster
Sun Mar 22, 2020 3:33 pm
Forum: hardware
Topic: RGB to HDMI using a Pi Zero and a small CPLD
Replies: 955
Views: 55875

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

I've got these cards from a reliable supplier I've been using for years, and the packaging is spot on, so maybe the printing is just a quirk of the manufacturing plant (happens to be Japan for these 8GB cards; everything else I've had from Kingston has been Taiwan or occasionally China). Gnome Discs...
by BeebMaster
Sat Mar 21, 2020 11:30 pm
Forum: hardware
Topic: RGB to HDMI using a Pi Zero and a small CPLD
Replies: 955
Views: 55875

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

Pins 1 & 2 look a bit suspect, I'll see what I can do about it tomorrow.
by BeebMaster
Sat Mar 21, 2020 10:26 pm
Forum: hardware
Topic: RGB to HDMI using a Pi Zero and a small CPLD
Replies: 955
Views: 55875

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

The auto calibration is showing a very high number of errors. None of the 8 sampling points are even close to 0 errors. Could you possibly try with a couple of other Beebs, just to rule out the problem being something atypical with this particular beeb? What's the cable connecting the Beeb to the Pi...
by BeebMaster
Sat Mar 21, 2020 10:18 pm
Forum: hardware
Topic: RGB to HDMI using a Pi Zero and a small CPLD
Replies: 955
Views: 55875

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

Is it right to say, then, that with one SD card the power-on reset doesn't happen, and with the other it does? I'd wonder if that points to a marginal power supply issue. Yes indeed, that's right. Here's a picture: SDCards.jpg The Philips one on the right is the original card I'd been using since J...
by BeebMaster
Sat Mar 21, 2020 8:43 pm
Forum: hardware
Topic: RGB to HDMI using a Pi Zero and a small CPLD
Replies: 955
Views: 55875

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

For comparison, here's what happens if I revert to the original SD card. It starts without pressing reset, then I did HDMI calibration (genlock failed) and auto calibration: Sat,21 Mar 2020.20:40:46.624187 ***********************RESET*********************** Sat,21 Mar 2020.20:40:46.624655 RGB to HDM...
by BeebMaster
Sat Mar 21, 2020 8:37 pm
Forum: hardware
Topic: RGB to HDMI using a Pi Zero and a small CPLD
Replies: 955
Views: 55875

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

Here's the capture:
capture0.png
by BeebMaster
Sat Mar 21, 2020 8:33 pm
Forum: hardware
Topic: RGB to HDMI using a Pi Zero and a small CPLD
Replies: 955
Views: 55875

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

Scrap that, HDMI wasn't connected!!! Here's the debug, still reset is needed to get anything to happen; then I did an HDMI calibration (genlock failed), auto calibration, and took a picture: Sat,21 Mar 2020.20:29:55.396513 ***********************RESET*********************** Sat,21 Mar 2020.20:29:55....
by BeebMaster
Sat Mar 21, 2020 8:26 pm
Forum: hardware
Topic: RGB to HDMI using a Pi Zero and a small CPLD
Replies: 955
Views: 55875

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

It's gone duff again, this is still with the new card. I don't get any picture at all, even after pressing reset: Sat,21 Mar 2020.20:21:52.382763 ***********************RESET*********************** Sat,21 Mar 2020.20:21:52.383285 RGB to HDMI booted Sat,21 Mar 2020.20:21:52.383441 Using PLLA as the s...
by BeebMaster
Sat Mar 21, 2020 8:16 pm
Forum: hardware
Topic: RGB to HDMI using a Pi Zero and a small CPLD
Replies: 955
Views: 55875

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

Right, I'm back in business. New card written, but nothing happens unless I press the reset switch, then I get the four colours and the Beeb screen (still with the pixel fault I had before it went wacky). If I put the old card back in, it starts automatically. Back to the new card, and reset is the ...
by BeebMaster
Sat Mar 21, 2020 7:50 pm
Forum: hardware
Topic: RGB to HDMI using a Pi Zero and a small CPLD
Replies: 955
Views: 55875

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. I'm also going to try a new card, I can put the 16GB card currently in situ to better use, I'll replace with one of the new 8...
by BeebMaster
Sat Mar 21, 2020 11:41 am
Forum: off-topic
Topic: Regex for UK Telephone Numbers
Replies: 19
Views: 562

Re: Regex for UK Telephone Numbers

We get that here too; most Oldham numbers are 0161 6xx xxxx, but lots of businesses use 01616 xxx xxx or 01616 xxxxxx for their number. I wouldn't like to say that this started as a result of the "shame factor" following the Oldham riots a few years back, but I don't remember seeing it beforehand, a...
by BeebMaster
Sat Mar 21, 2020 11:34 am
Forum: hardware
Topic: RGB to HDMI using a Pi Zero and a small CPLD
Replies: 955
Views: 55875

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 BeebMaster
Wed Mar 18, 2020 5:53 pm
Forum: hardware
Topic: RGB to HDMI using a Pi Zero and a small CPLD
Replies: 955
Views: 55875

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: capture3.png capture4.png That's with v21-v23 BBC Micro profile setting, and I've used the 10/3/2020 f...
by BeebMaster
Mon Mar 16, 2020 11:10 pm
Forum: upcoming and recent events & exhibitions
Topic: ABUG SOUTH 13 to 15 November 2020 - Save the Date - NOT A BOOKING THREAD
Replies: 12
Views: 466

Re: ABUG SOUTH 13 to 15 November 2020 - Save the Date - NOT A BOOKING THREAD

Blackwater is the nearest railway station to the Ely, although it doesn't help the journey from Stansted much. However if you could fly to Gatwick (assuming that there will still be such a thing as air travel by then) there's a direct train taking slightly over an hour to Blackwater (assuming there ...
by BeebMaster
Sat Mar 14, 2020 2:09 pm
Forum: hardware
Topic: BBC Master Composite colour fix - stuck
Replies: 33
Views: 837

Re: BBC Master Composite colour fix - stuck

I think in fairness when compared to the BBC B, where special attention has to be given to the motherboard issue number when fault-finding or upgrading, because of the differences between issues 2, 3, and 4, in the case of the Master there are very few differences between issue 1 and issue 2. The ad...
by BeebMaster
Sat Mar 14, 2020 1:52 pm
Forum: software
Topic: Upgrading RISC OS 3.70
Replies: 12
Views: 596

Re: Upgrading RISC OS 3.70

Yep, just crashed the file server when it got to 77, did it repeatedly. There wasn't even a dir full error, just no response at all and eventually a No reply error on the user station. It could be a curiosity with the RISC PC and Advanced Level 4 I suppose, plus I'm using the Econet module podule wh...
by BeebMaster
Sat Mar 14, 2020 1:46 pm
Forum: software: other
Topic: Pascal Roms
Replies: 51
Views: 4886

Re: Pascal Roms

Whilst waiting, you can load the Pascal ROM image into sideways RAM in your Master and use it from there: *SRLOAD <filename> 8000 <bank> Q where <bank> is 4, 5, 6 or 7 which is where the Master's sideways RAM banks are mapped. Q is optional meaning Quicker, and overwrites user RAM with the ROM image...