Search found 530 matches

by sorchard
Wed May 03, 2023 10:07 am
Forum: Dragon General
Topic: French Dragons and the PN41503 motherboard
Replies: 8
Views: 19821

Re: French Dragons and the PN41503 motherboard

Hi Stew! It's been a while, you keeping well? Hi Tony, I'm good thanks, apart from the day job sucking the life out of me. Starting to regret not working harder in my youth :lol: Hope you're keeping well too. I really admire what you're doing on Twitter btw. Edit: Double post. That's a new one!
by sorchard
Wed May 03, 2023 10:06 am
Forum: Dragon General
Topic: French Dragons and the PN41503 motherboard
Replies: 8
Views: 19821

Re: French Dragons and the PN41503 motherboard

tjewell wrote: Mon May 01, 2023 5:57 pm Hi Stew! It's been a while, you keeping well?
Hi Tony, I'm good thanks, apart from the day job sucking the life out of me. Starting to regret not working harder in my youth :lol:

Hope you're keeping well too. I really admire what you're doing on Twitter btw.
by sorchard
Wed May 03, 2023 10:00 am
Forum: Software Requests
Topic: Happy Birthday Dragon Individual Games
Replies: 6
Views: 11327

Re: Happy Birthday Dragon Individual Games

The start, end and exec addresses for a simple binary file can be found with a few PEEKs after loading: CLOADM ST=PEEK(&H1E7)*256+PEEK(&H1E8) EN=PEEK(&H7E)*256+PEEK(&H7F)-1 EX=PEEK(&H1E5)*256+PEEK(&H1E6) CSAVEM"NAME",ST,EN,EX This won't work with custom formats such as autorun programs, but should b...
by sorchard
Tue Apr 25, 2023 7:57 pm
Forum: Dragon General
Topic: French Dragons and the PN41503 motherboard
Replies: 8
Views: 19821

Re: French Dragons and the PN41503 motherboard

Hi Tony! I don't know if you've already found it but there was a discussion here on the SECAM boards a while back: https://archive.worldofdragon.org/phpBB3/viewtopic.php?f=9&t=10921 It looks like the boards need to be paired as the power connector seems to have a different layout. (i.e. resist the t...
by sorchard
Mon Apr 17, 2023 4:17 pm
Forum: Dragon Hardware
Topic: Dragon keyboard conversion to USB HID (XRoar)
Replies: 23
Views: 48883

Re: Dragon keyboard conversion to USB HID

I don't really know how your setup works, but producing @ on a PC keyboard usually involving pressing shift, which may interfere with the logic at the Dragon end. Also is it coincidence that @ vs " is one of the differences between US & UK keyboards? What happens if you type into a text editor inste...
by sorchard
Sun Mar 19, 2023 4:34 pm
Forum: Dragon General
Topic: XRoar video debug builds
Replies: 25
Views: 28513

Re: XRoar video debug builds

Brilliant stuff! It recreates the purple shimmer on the PMODE4 display beautifully :) To complete the Dragon video experience we would need a small and very slow drift on the colour frequency to simulate the machine warming up! @Alistair Chroma highpass can be set to zero or 0.25 to simulate the eff...
by sorchard
Thu Feb 16, 2023 9:48 pm
Forum: Dragon Hardware
Topic: Dragon 32 with DRAM removed, video output?
Replies: 15
Views: 17459

Re: Dragon 32 with DRAM removed, video output?

I would have expected some kind of video display i.e. something with a border. The vdg will generate sync signals with just a clock input, except when something is pulling the CHB output down to ground activating a test mode. I've seen this happen once due to a bad ceramic cap. The video circuit req...
by sorchard
Mon Apr 11, 2022 4:25 pm
Forum: Dragon General
Topic: OLL '22 Video Games Convention
Replies: 3
Views: 5843

Re: OLL '22 Video Games Convention

sixxie wrote: Mon Apr 11, 2022 3:08 pm nice one :) which level?
Level 19. MIght have got a little bit further but had to play standing up.

I then played Doom for half an hour and gave myself motion sickness. Guess I'm starting to feel my age :)
by sorchard
Mon Apr 11, 2022 2:45 pm
Forum: Dragon General
Topic: OLL '22 Video Games Convention
Replies: 3
Views: 5843

OLL '22 Video Games Convention

We had a family afternoon out at the recent OLL '22 Video Games Convention as it was close to where we live. The Centre for Computing History had quite a large presence and I was pleasantly surprised to see a D32 set up with Chuckie Egg. Of course I felt obliged to put my name on the high score tabl...
by sorchard
Fri Jan 14, 2022 2:25 pm
Forum: Dragon Hardware
Topic: D64 with new Dragon PSU issue
Replies: 12
Views: 8763

Re: D64 with new Dragon PSU issue

Curious that it works in a D32. Can't really say much else without seeing a schematic and more detailed measurements.

Assuming you've followed the build instructions to the letter, the ball is very firmly in the court of the supplier and/or designer.