Search found 251 matches

by prime
Thu Nov 26, 2009 4:00 am
Forum: Dragon General
Topic: Dragon replacement power supply
Replies: 9
Views: 2279

Re: Dragon replacement power supply

Good News, kinda What where they thinking when dragondata selected this power supply option, was it just a rip-off of the COCO? Like a lot of things it may have boiled down to 'we can get a bload load of these cheaper than any other option and they can be made to work so we use them' I believe that...
by prime
Fri Nov 20, 2009 8:46 am
Forum: Dragon General
Topic: Dragon replacement power supply
Replies: 9
Views: 2279

Re: Dragon replacement power supply

If your skills are up to it, you could try drilling out the pop rivets and removing the cover to see if the problem is anything obvious. With luck it may be something that is simple to repair. I'm not sure of the best way of re-securing the cover though: nuts, bolts, and washers from Meccano perhap...
by prime
Fri Oct 23, 2009 7:47 am
Forum: Dragon General
Topic: Nitros9 on the Dragon 64 ...
Replies: 5
Views: 2067

Re: Nitros9 on the Dragon 64 ...

sixxie wrote:NitrOS-9 isn't a DragonDOS disk, so you can't DIR it.
{pedantic}
Or at least not until you booted it first....as Nitros9 does use dir to get a list of files.......
{/pedantic}

Phill.
by prime
Fri Aug 14, 2009 2:03 am
Forum: Dragon General
Topic: Extra PCB fitted to Dragon 32
Replies: 14
Views: 5217

Re: Extra PCB fitted to Dragon 32

If you have the ability to take a couple of good quality digital pictures (top and bottom of board) and post them somewhere, I could have a go at tracing the board, which might help work out what it's for.

Cheers.

Phill.
by prime
Fri Aug 14, 2009 2:00 am
Forum: Dragon General
Topic: communications through the printer port
Replies: 2
Views: 1088

Re: communications through the printer port

Welll...looking at the circuit diagram the Dragon paralell port has available the PIA lines that the CoCo uses for it's serial bit-banger, so you could in theory use this (with apropreate software) use the lines as a CoCo bit-banger port. You would of course also need a level shifter between the 5v/...
by prime
Sat Aug 08, 2009 2:38 am
Forum: Uploads
Topic: Dragon 64k PAL Video Schematic
Replies: 6
Views: 3761

Re: Dragon 64k PAL Video Schematic

That is most excellent.....humm wonder if I could use bits of that circuit to make a colour board for my Acorn Atom clone (or the original Atom come to think of it) as they both also use the 6847 VDG.

Cheers.

Phill.
by prime
Wed Jul 22, 2009 1:32 am
Forum: Dragon General
Topic: Co-Co Ram size detection?
Replies: 11
Views: 3400

Re: Co-Co Ram size detection?

Bad luck with the 16K, but there are an awful lot of them out there. At least you didn't get an ultra-early 4K model. ;) (Or maybe they're worth more?) Yeah I believe so as the majority where upgraded..... Upgrading might be possible... And for the most part with a CoCo 1 which is what the OP has, ...
by prime
Wed Jul 08, 2009 1:30 am
Forum: Dragon General
Topic: Wanted Quickshot 1 or 2 for Dragon/Co-co
Replies: 3
Views: 1432

Re: Wanted Quickshot 1 or 2 for Dragon/Co-co

I have a couple of the voltmace sticks and they are quite nice also, as they are also self centering.

I believe they where also available for the BBC too.

Cheers.

Phill.
by prime
Fri May 29, 2009 10:59 pm
Forum: Dragon General
Topic: General Instruments AY sound chip interface?
Replies: 4
Views: 1500

Re: General Instruments AY sound chip interface?

The Dragon Alpha also had one as standard (AY-3-8912), used it for sound and to control the drive selects on the disk interface. It would be possible to add this to a Dragon 32/64, but would require socketing one of the PIAs, and adding a second, the AY was connected to one of the ports on the 3rd P...
by prime
Sun May 17, 2009 11:08 am
Forum: Dragon General
Topic: Cartridge question
Replies: 4
Views: 1564

Re: Cartridge question

What puzzles me is that only the first of the two socketed chips have the "erase window". Maybe they used a mixed of EPROMS and non erasable roms? I have seen some EPROMS used in Dragon carts where instead of the sticker, the window was painted black. The other posibility is that the second chip is...