Search found 2557 matches

by tricky
Sun Jul 22, 2018 7:28 am
Forum: hardware
Topic: RGB to HDMI using a Pi Zero and a small CPLD
Replies: 245
Views: 8117

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

Here is a link to the video of what the fuel bar corruption looks like on the NuLA beeb with mux off. https://www.dropbox.com/s/66v26f14tinrgc0/ScrambleFuelCorruption.avi?dl=0 With the mode 0 test screen, in the left hand edge line, the corruption can be seen moving down the screen several times a s...
by tricky
Sat Jul 21, 2018 5:35 pm
Forum: hardware
Topic: RGB to HDMI using a Pi Zero and a small CPLD
Replies: 245
Views: 8117

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

Turning on input mux got the mode 7 errors down from 1400 to about 100 (about 2 pixels) and completely fixed the scramble issues. The mode 7 issues weren't on diagonals, but on the highlighted row on the games menu where red meets green on straight verticals. The Panasonic appears to be doing the (s...
by tricky
Sat Jul 21, 2018 1:21 pm
Forum: hardware
Topic: RGB to HDMI using a Pi Zero and a small CPLD
Replies: 245
Views: 8117

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

NuLA is on a Model B (early model 7).
by tricky
Sat Jul 21, 2018 1:17 pm
Forum: hardware
Topic: Troubleshooting the Analogue Port with DB9 Joystick Adapter
Replies: 4
Views: 72

Re: Troubleshooting the Analogue Port with DB9 Joystick Adapter

Channel 0 has the two fire buttons in the least 2 significant bits, so one fire-button (the first one) will change the value by 1 and the other by 2. Channel 1 is horizontal for the first joystick and 2 vertical with 3 and 4 the same for the second joystick. (I may have H and V swapped). Right and D...
by tricky
Sat Jul 21, 2018 12:58 pm
Forum: hardware
Topic: RGB to HDMI using a Pi Zero and a small CPLD
Replies: 245
Views: 8117

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

Found a cable and had a few panic moments! It turns out that the HDMI socket on my monitor is missing the socket and only has the flat centre section that goes into the plug and I can't get it working on the few resolutions that I have tried. This was followed by several more minor dramas! Falling b...
by tricky
Fri Jul 20, 2018 9:50 pm
Forum: hardware
Topic: RGB to HDMI using a Pi Zero and a small CPLD
Replies: 245
Views: 8117

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

Sorry, I don't know how I missed that, I mist have also not searched for not 1200!
by tricky
Fri Jul 20, 2018 8:11 pm
Forum: hardware
Topic: RGB to HDMI using a Pi Zero and a small CPLD
Replies: 245
Views: 8117

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

Mine arrived today, I've made a cable and soldered up the PI.
The HDMI cable I had ready is too small for the PI, so I will have to dig another out tomorrow.
The PI doesn't seem to have a 1920x1200p50 mode, so I will go with 1080p50 and set the monitor to 1:1.
by tricky
Fri Jul 20, 2018 1:11 pm
Forum: hardware
Topic: 80 column teletext
Replies: 30
Views: 2676

Re: 80 column teletext

...The Master does indeed have a custom chip, I should think it does something like the MA6 bodge. I tried getting 56 chars TTX on the Master last night but it appears that when I selected the teletext bit in the video ULA it forced the 1k memory map into action rather than on the model B the telet...
by tricky
Fri Jul 20, 2018 12:53 pm
Forum: hardware
Topic: RGB to HDMI using a Pi Zero and a small CPLD
Replies: 245
Views: 8117

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

My original idea was to +/-2 to the width and -/+1 to the offset to make no visible difference on the screen for each bit. This was to allow "full speed/frame" comm's, but if it was just from vsync for a fixed number of lines that would be simpler. This would allow for about 38 bits, which would all...
by tricky
Fri Jul 20, 2018 9:46 am
Forum: hardware
Topic: RGB to HDMI using a Pi Zero and a small CPLD
Replies: 245
Views: 8117

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

I'm not suggesting that you do it or that I want one, but could you spot the different colours as they arrive and effectively palatalise on the fly, passing on new colours at end of line to update the PI palette (probably requires GPU support) and only sending 4 bits per pixel (or 3 if 4 is too many...
by tricky
Fri Jul 20, 2018 9:28 am
Forum: acorn atom
Topic: new to atom: ram rom mmc joystick power
Replies: 23
Views: 428

Re: new to atom: ram rom mmc joystick power

Thanks oss003, that will make checking easier. Thanks Prime, does it come ready for the MMC board or do I need to program some EPROMS? Is there a list of which chips I can remove to reduce power? (assuming it is recommended). Thanks DutchAcorn, mine had been converted to 5V and didn't come with a PS...
by tricky
Thu Jul 19, 2018 9:56 pm
Forum: hardware
Topic: RGB to HDMI using a Pi Zero and a small CPLD
Replies: 245
Views: 8117

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

Why does changing the sync pulse width on a crt but not it's start move the image by exactly (as far as I can tell) half the change in width.
by tricky
Thu Jul 19, 2018 6:39 pm
Forum: hardware
Topic: SCART image quality
Replies: 9
Views: 229

Re: SCART image quality

...There are no options to turn off smoothing on the Samsung monitor either... Are there any options for sharpness or sometimes contrast enhancements? I have an LCD that doesn't like my beeb's signal much, the picture slides from side to side and blanks completely sometimes. If I increase the h-syn...
by tricky
Thu Jul 19, 2018 6:27 pm
Forum: acorn atom
Topic: new to atom: ram rom mmc joystick power
Replies: 23
Views: 428

Re: new to atom: ram rom mmc joystick power

My power sockets arrived today, so I trimmed one a little and hot glued it in my ATOM to see if it is OK. My cunning plan it to mount the MMC sticking out through where the video and power would have been (composite is through RF connector). At first, it didn't work, which turned out to be that only...
by tricky
Wed Jul 18, 2018 10:34 pm
Forum: introduce yourself
Topic: Hi!!
Replies: 12
Views: 168

Re: Hi!!

Welcome, glad you've joined us.
Have you tried prince of Persia yet, or any of the other homebrew on bbcmicro.co.UK that doesn't come on the mmc?
by tricky
Wed Jul 18, 2018 10:28 pm
Forum: software: other
Topic: Music software?
Replies: 13
Views: 288

Re: Music software?

I know nothing about music, but to get you started: There is muproc . You could possibly use a Sega master system tracker, export to vgm and then use the vgm player on the beeb to play it back. There is lots of info about the SN76489 on smspower. Edit: sorry the above post came in while I was typing...
by tricky
Wed Jul 18, 2018 6:01 pm
Forum: introduce yourself
Topic: Hello from Basingstoke!
Replies: 10
Views: 101

Re: Hello from Basingstoke!

Welcome, I think most of us are familiar with time issues and real life getting in the way.
by tricky
Wed Jul 18, 2018 1:05 pm
Forum: hardware
Topic: RGB to HDMI using a Pi Zero and a small CPLD
Replies: 245
Views: 8117

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

I was thinking of getting a zero W, but I would want to swap it for a PiTubeDirect CoPro as that seems like a place where the W might be useful.
by tricky
Tue Jul 17, 2018 5:18 pm
Forum: development tools
Topic: Beebasm requests
Replies: 9
Views: 189

Re: Beebasm requests

...BTW Really loving beebasm and Visual Studio Code as a dev environment. I use Visual Studio on a day to day basis, and couldn't even think about going back to the BBC Basic editor / environment! I'd also be interested to know how people are debugging Beeb code using PC emulators / dev environment...
by tricky
Tue Jul 17, 2018 4:28 pm
Forum: introduce yourself
Topic: Hello!
Replies: 17
Views: 267

Re: Hello!

That's great, I look forward to hearing your beeb tracks.
by tricky
Mon Jul 16, 2018 8:16 pm
Forum: hardware
Topic: RGB to HDMI using a Pi Zero and a small CPLD
Replies: 245
Views: 8117

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

Well done.
by tricky
Mon Jul 16, 2018 8:10 pm
Forum: introduce yourself
Topic: Hello!
Replies: 17
Views: 267

Re: Hello!

Welcome, although I usually do arcade ports and try to keep the music similar, I never write it myself. I'm doing scramble at the moment, which doesn't really need music and it would be tricky as I am using one channel for "womwom", one for bombs and one for shooting with explosions taking the white...
by tricky
Mon Jul 16, 2018 4:10 pm
Forum: introduce yourself
Topic: Atom Owner from Smalltown, Canada
Replies: 20
Views: 250

Re: Atom Owner from Smalltown, Canada

Welcome, there have been a few of us just got ATOMs.
Did you program in BASIC or assembler?
by tricky
Mon Jul 16, 2018 4:08 pm
Forum: hardware
Topic: 2nd User port for Beeb?
Replies: 98
Views: 6265

Re: 2nd User port for Beeb?

Don't know if this is still useful! It's a bit early and I've woken after dreaming what I'm about to write so forgive me if it's nonsense! Would it be possible to change the pins on the user port used by UPURS or MMBEEB so that they don't clash as they do at present and have them both work off one u...
by tricky
Mon Jul 16, 2018 12:09 pm
Forum: software: new games
Topic: Atomic AGD
Replies: 63
Views: 3518

Re: Atomic AGD

Did the sprite plotting get optimised?

If you want 50+Hz playback on youtube, the source has to be 720p+, as does the playback.
by tricky
Sun Jul 15, 2018 6:13 pm
Forum: software: new games
Topic: New version of Scramble for the beeb (going well)
Replies: 64
Views: 3550

Re: New version of Scramble for the beeb (going well)

Is it just the picture, or is there a problem with scramble?
by tricky
Sun Jul 15, 2018 6:10 pm
Forum: hardware
Topic: RGB to HDMI using a Pi Zero and a small CPLD
Replies: 245
Views: 8117

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

Does PLLH allow the 50hz to be adjusted?
Might it be possible to remove the frame delay in the future?
by tricky
Sun Jul 15, 2018 4:02 pm
Forum: hardware
Topic: RGB to HDMI using a Pi Zero and a small CPLD
Replies: 245
Views: 8117

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

I've always thought that the TV uses the centre of the pulse. If it is easier to only support 7 or 8, rather than start + 1/2 width, I can change the rally-x default. I thought one of the scramble clones might have and maybe JCB digger. I have some old code and I suspect richtw might. Astro blaster ...
by tricky
Sun Jul 15, 2018 3:21 pm
Forum: hardware
Topic: RGB to HDMI using a Pi Zero and a small CPLD
Replies: 245
Views: 8117

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

I'm not near a beeb, but I would expect making the pulse wider would delay the effective timing and move the visible pixels to the left.

I believe rally-x works in the same way as 3d pool's scrolls, although i do tidy the sides.
by tricky
Sun Jul 15, 2018 3:09 pm
Forum: software: new games
Topic: New version of Scramble for the beeb (going well)
Replies: 64
Views: 3550

Re: New version of Scramble for the beeb (going well)

Glad it works.
How is your event going?
Looks a bit quiet ;)