Search found 826 matches

by dominicbeesley
Sat Sep 14, 2019 12:58 pm
Forum: off-topic
Topic: Capturing interlaced / 50Hz video
Replies: 28
Views: 532

Re: Capturing interlaced / 50Hz video

I have been seriously considering a hdmi nula...would be cheaper but not sure about all the parents and licences on hdmi or dvi
by dominicbeesley
Tue Sep 10, 2019 3:28 pm
Forum: off-topic
Topic: Capturing interlaced / 50Hz video
Replies: 28
Views: 532

Re: Capturing interlaced / 50Hz video

You do if it contains a RobC nula!
by dominicbeesley
Tue Sep 10, 2019 1:37 pm
Forum: off-topic
Topic: Capturing interlaced / 50Hz video
Replies: 28
Views: 532

Re: Capturing interlaced / 50Hz video

Sorry Beebmaster, I posted before I'd finished typing - I meant to say thanks for the offer! RR, that's what I was hoping the roxio "pro" would do but it only gives the option of 25fps de-interlaced. It will do for now - it's better than the phone and cheap chinese capture device which record at a v...
by dominicbeesley
Tue Sep 10, 2019 12:36 pm
Forum: off-topic
Topic: Capturing interlaced / 50Hz video
Replies: 28
Views: 532

Re: Capturing interlaced / 50Hz video

I very much doubt that the DVD will do what I want (it will probably do the same as the Roxio which is 25fps) I want to produce a scan-doubled 576p/50 when recorded from 576i. Something like defender or the twisted brain demo would maybe show it up. I'm probably being very picky but I know what I'm ...
by dominicbeesley
Tue Sep 10, 2019 10:37 am
Forum: off-topic
Topic: Capturing interlaced / 50Hz video
Replies: 28
Views: 532

Re: Capturing interlaced / 50Hz video

I got it going on my laptop and I have been left a little disappointed. It seems to only record at 25fps (there are few settings and most stuff is automatic depending on the signal detected) and does its own de-interlacing which looks good on normal material but on the scrolling moving stuff I'm wan...
by dominicbeesley
Mon Sep 09, 2019 4:41 pm
Forum: for sale / freebies
Topic: VideoNuLA boards
Replies: 91
Views: 14961

Re: VideoNuLA boards

Good to know I'm not alone!

I've now hit the limit so I need to start optimising...this could be fun
by dominicbeesley
Mon Sep 09, 2019 10:51 am
Forum: projects
Topic: Wave Runner Demo Details
Replies: 20
Views: 1032

Re: Wave Runner Demo Details

Thanks for this write up - behind the scenes explications are very welcome! I'll give it a good read later tonight

D
by dominicbeesley
Mon Sep 09, 2019 10:46 am
Forum: off-topic
Topic: Capturing interlaced / 50Hz video
Replies: 28
Views: 532

Re: Capturing interlaced / 50Hz video

Thanks beebmaster, I may end up doing that - I've got a couple of cakes of DVDs that need using up! I got the Roxio HD this weekend - I suspect it will be relegated to the junk box or sold on. I installed the software and started it up...no signal, try another port, a brief flash of something and th...
by dominicbeesley
Thu Sep 05, 2019 9:55 am
Forum: for sale / freebies
Topic: VideoNuLA boards
Replies: 91
Views: 14961

Re: VideoNuLA boards

Cool. How do you go about optimising stuff. I have to admit recently in my projects I've been using much larger devices and not really bothered with LE level optimisation. (I did do some stuff with the DC PAL which required a bit of thought but that was pretty simple). I've played around with the to...
by dominicbeesley
Wed Sep 04, 2019 5:24 pm
Forum: for sale / freebies
Topic: VideoNuLA boards
Replies: 91
Views: 14961

Re: VideoNuLA boards

No probs rob, you might be able to sneak something in to reset on a write to another register? It must be tight - you've done well to squeeze all the extras in as it is. It's turned out to be not such a problem in the end I just reset every frame and put up with the occasional glitch - I must track ...
by dominicbeesley
Wed Sep 04, 2019 2:25 pm
Forum: off-topic
Topic: Capturing interlaced / 50Hz video
Replies: 28
Views: 532

Re: Capturing interlaced / 50Hz video

I was under the impression that some de-interlacers used motion compensation (where it tries to guess the trajectory of moving objects and compensate for this)...something I really don't want. I bow to your superior knowledge though!

D
by dominicbeesley
Wed Sep 04, 2019 11:46 am
Forum: off-topic
Topic: Capturing interlaced / 50Hz video
Replies: 28
Views: 532

Re: Capturing interlaced / 50Hz video

Noted. Though I suspect the Roxio will tolerate some non-standard behaviour. I seem to remember the Wii does something non-standard with interlace which caused a large screen set we were using to randomly turn on and off its PAL dot-crawl filter (I may be misremembering). Effectively the games and d...
by dominicbeesley
Tue Sep 03, 2019 11:08 pm
Forum: for sale / freebies
Topic: VideoNuLA boards
Replies: 91
Views: 14961

Re: VideoNuLA boards

Edit: the manual says writing &4x to the control register reset nULA to its default state, then lists these default states, but the &FE23 toggle is not listed in that list. The reset command (?&FE22=&4x or *VNRESET) also resets the toggle state so that the next poke to &FE23 sets the index and red ...
by dominicbeesley
Tue Sep 03, 2019 10:58 pm
Forum: off-topic
Topic: Capturing interlaced / 50Hz video
Replies: 28
Views: 532

Re: Capturing interlaced / 50Hz video

I'll report back when I know more!

D
by dominicbeesley
Tue Sep 03, 2019 10:58 pm
Forum: hardware
Topic: New 68k co-pro
Replies: 40
Views: 4811

Re: New 68k co-pro

Mm, if I wanted to write Unix there would be a lot more stuff in the way than the traps! I'd expect a UNIX to take over the whole system (which is possible once in supervisor mode as the 0..0FF area is writeable) rather than sit on top of the MOS. However, your point is taken.

D
by dominicbeesley
Tue Sep 03, 2019 1:31 pm
Forum: off-topic
Topic: Capturing interlaced / 50Hz video
Replies: 28
Views: 532

Re: Capturing interlaced / 50Hz video

I've found a relatively cheap Roxio HD on ebay so I'll give that a punt and sell it if its no good! Hopefully it should do 576i and I can take RR's advice and deinterlace.

D
by dominicbeesley
Tue Sep 03, 2019 1:29 pm
Forum: off-topic
Topic: Capturing interlaced / 50Hz video
Replies: 28
Views: 532

Re: Capturing interlaced / 50Hz video

Thanks all, Tricky, I'm tempted for the capture HD but not sure it will do what I want - the software gets very mixed reviews and I don't want to waste £80 on something that will get chucked in the junk box, I'd like to see it running in the flesh on an RGB signal - I may just have to go for it. RR,...
by dominicbeesley
Tue Sep 03, 2019 8:30 am
Forum: off-topic
Topic: Capturing interlaced / 50Hz video
Replies: 28
Views: 532

Capturing interlaced / 50Hz video

I'd like to be able record my demos to proper interlaced 576i PAL type video for posting up on the net. I've tried a few cheapo capture cards but most are just garbage and either don't work or come with such crap software as to be virtually unusable. Has anyone tried the Roxio Game Capture or Game C...
by dominicbeesley
Tue Sep 03, 2019 8:22 am
Forum: other vintage computer hardware, software and games
Topic: What brand/type of FPGA
Replies: 11
Views: 660

Re: What brand/type of FPGA

For reference it's worth considering the Waveshare products https://www.waveshare.com/product/fpga-tools/altera/altera-boards.htm they're relatively inexpensive and well made - the documentation is a bit convoluted but once you've worked out what pin does what they stuff all works well. For ease of ...
by dominicbeesley
Tue Sep 03, 2019 8:04 am
Forum: hardware
Topic: New 68k co-pro
Replies: 40
Views: 4811

Re: New 68k co-pro

Thanks JGH, Was there a reason to avoid the pre-existing traps? Maybe an intent to provide an emulation layer? That sounds like a lot of work. I got a bit further before I parked this - I got most of text based VDU in all modes working a simple "SWI" dispatcher and a few SWI's such as OS Byte and th...
by dominicbeesley
Sat Aug 31, 2019 8:51 am
Forum: hardware
Topic: A blitter for the beeb?
Replies: 103
Views: 9600

Re: A blitter for the beeb?

Thanks vectoreyes
by dominicbeesley
Sat Aug 31, 2019 8:46 am
Forum: hardware
Topic: A blitter for the beeb?
Replies: 103
Views: 9600

Re: A blitter for the beeb?

That sounds interesting. It should be possible though maybe less useful with the blitter. What is the aim of three linear mode? (Make sprite plotting easier?)

D
by dominicbeesley
Fri Aug 30, 2019 2:10 pm
Forum: hardware
Topic: A blitter for the beeb?
Replies: 103
Views: 9600

Re: A blitter for the beeb?

Thanks Everyone for the encouragement. Thanks Tricky, I understand. I suspect I need to think about getting emulator support for this before anyone will consider writing software for it. That's another steep learning curve. I tried hacking MAME but didn't get it to even work yet. I've not managed to...
by dominicbeesley
Tue Aug 27, 2019 4:10 pm
Forum: hardware
Topic: A blitter for the beeb?
Replies: 103
Views: 9600

Re: A blitter for the beeb?

Thanks @cmorley, @hoglet, The lack of replies can be a bit discouraging, but that aside I'm genuinely interested if people are interested in the Copper/Aeris idea. I find it difficult to judge what actually interests people - this is all a bit niche until somebody does something useful with it. BITD...
by dominicbeesley
Tue Aug 27, 2019 2:41 pm
Forum: hardware
Topic: A blitter for the beeb?
Replies: 103
Views: 9600

Re: A blitter for the beeb?

I'm not sure whether to take the silence as a lack of interest or just no comment.

Is this something that anyone else is interested in or should I just forget it?

D
by dominicbeesley
Mon Aug 26, 2019 11:31 pm
Forum: hardware
Topic: A blitter for the beeb?
Replies: 103
Views: 9600

Re: A blitter for the beeb?

Back to graphics... I have been reading through the Twisted Brain thread during a couple of train journeys recently and it got me thinking whether something akin to the Amiga's "Copper" chip would work in the Beeb. [For those who don't know the copper chip is a cut-down co-processor which can execut...
by dominicbeesley
Mon Aug 26, 2019 11:15 pm
Forum: projects
Topic: Twisted Brain Demo
Replies: 39
Views: 4791

Re: Twisted Brain Demo

Thanks for this excellent and inspiring write up. I love a walk through code like this and I really appreciate the time you've taken to offer up your secrets!

D
by dominicbeesley
Thu Aug 15, 2019 3:31 pm
Forum: hardware
Topic: New 68k co-pro
Replies: 40
Views: 4811

Re: New 68k co-pro

...When looking through the code last month it seemed that using the Ax registers would be more logical. I decided to use the following analogy: SWI number in A0 R0-R7=D0-D7 R8-R11=A1-A4 What I was thinking was that it should be: ARM R0-R7 = 68000 A0-A7 as the majority of parameters passed are "add...
by dominicbeesley
Thu Aug 15, 2019 10:58 am
Forum: hardware
Topic: A blitter for the beeb?
Replies: 103
Views: 9600

Re: A blitter for the beeb?

I've been trying out the 68008 chip as the main processor for the beeb. So far I've ported the vdu driver part of the MOS to the 68008, I've not optimised it much other than the obvious use of larger registers in CLS and the rendering of characters but it looks quite promising. The code density is r...
by dominicbeesley
Thu Jul 18, 2019 4:09 pm
Forum: programming
Topic: BBC BASIC integer range
Replies: 1
Views: 173

Re: BBC BASIC integer range

A good point that i often forget. Thanks for posting this