Search found 10 matches

by roganjosh
Tue Jan 04, 2022 10:22 am
Forum: Dragon Hardware
Topic: Display bars
Replies: 2
Views: 2580

Re: Display bars

How is the converter powered? That could be a source of noise. Have you tried going direct to the composite input of a TV? Do you have more than one Dragon transformer to try? The converter is powered by a 5V DC wall wart. The original wart failed mechanically rather than electronically but its rep...
by roganjosh
Mon Jan 03, 2022 6:02 pm
Forum: Dragon Hardware
Topic: Display bars
Replies: 2
Views: 2580

Display bars

All my Dragons, before a couple were modified to accept an external RGBTOHDMI, suffered from vertical jail bars and something resembling horizontal hum bars on the display. My original display setup was: Original Dragon PSU->Dragon->SCART to HDMI converter->LCD display. The vertical jail bars were n...
by roganjosh
Mon Jan 03, 2022 3:41 pm
Forum: Dragon Hardware
Topic: Atom RGB port?
Replies: 3
Views: 3786

Re: Atom RGB port?

Thanks all.

It seems that's time enough for all to reply who might do so. However, if you happen to remember what the problems were in adapting the Hoglet board to the Dragon my curiosity is still piqued (but isn't itching quite as much now that the RGBTOHDMI is hooked up).

Alan
by roganjosh
Sun Dec 12, 2021 8:47 am
Forum: Hints and Tips
Topic: Some useful short 6809 routines
Replies: 2
Views: 8648

Re: Some useful short 6809 routines

Thanks Stew. It's so easy at the moment to slip back into a 6502 style of thinking. I remember doing a 64bit multiply on the 68000 using mulu. At some stage I may dig that method out, convert it to 6809 and possibly add it to the library.

Alan
by roganjosh
Sun Dec 12, 2021 8:41 am
Forum: Dragon General
Topic: Forum history?
Replies: 2
Views: 4005

Re: Forum history?

Thanks Mike for the detailed reply. Much appreciated. I prefer quiet and considered to loud and frequent so it looks like I've joined the right group. People can rest assured that this degree of posting is unusual for me.

Alan
by roganjosh
Sat Dec 11, 2021 7:31 pm
Forum: Dragon Hardware
Topic: Atom RGB port?
Replies: 3
Views: 3786

Atom RGB port?

Here's a slightly cranky one. Does anyone know whether a version of the HogletColourBoardV3 for the Atom was ever ported to the Dragon? Here is a zipped pdf of the Atom schematic: HogletColourBoardV3.zip Having had some spare time to mess around I built one, seeing no immediate reason why it would b...
by roganjosh
Sat Dec 11, 2021 6:38 pm
Forum: Dragon General
Topic: Forum history?
Replies: 2
Views: 4005

Forum history?

I'm curious about the history of this forum and how it relates to any spinoff. I have heard that there is also a facebook group for the Dragon. I'm wondering whether this (worldofdragon) forum happened first and that subsequently there was a partial exodus from it to facebook or whether the two grou...
by roganjosh
Sat Dec 11, 2021 3:51 pm
Forum: Hints and Tips
Topic: Some useful short 6809 routines
Replies: 2
Views: 8648

Some useful short 6809 routines

Although I've programmed the Z80/6502/68000/etc a lot I'm a noob to the Dragon and the 6809. I therefore did some searching on the net to see if there were any useful maths and utility routines. The sort of routines you use regularly such as outputting hexadecimal from binary or doing a 30x30 divisi...
by roganjosh
Wed Oct 27, 2021 9:04 am
Forum: Discuss This Site
Topic: New Leodensian member
Replies: 2
Views: 8109

Re: New Leodensian member

Thanks Stew,

It would certainly have been more convenient 8 years ago before I moved from Cambridge to Leeds. I know the venue well.

Alan
by roganjosh
Tue Oct 26, 2021 12:38 pm
Forum: Discuss This Site
Topic: New Leodensian member
Replies: 2
Views: 8109

New Leodensian member

Hello, I'm a newbie here. With luck I'll pick up who's who and what's what soon enough. I'm a retro-computing enthusiast having sprinklings of ZX81s, Jupiter Aces, Spectrums, Toastracks, QLs, BBC micros, Commodore 64s, Atari ST(&E)s, Amiga 1200s, single board retro computers, etc. I'm on the fora fo...