Search found 228 matches

by Rolo
Mon Jun 24, 2013 8:18 pm
Forum: Hints and Tips
Topic: Introducing: Dragon multi-cartridge for roms
Replies: 16
Views: 8428

Re: Introducing: Dragon multi-cartridge for roms

Yeah, the whole thing is funny, or maybe crazy? The most expensive part of my Dragon is the floppy emulator. And the display driver of the cartridge is more powerful, than the Dragon computer itself. By the way, I just bought 16 eproms (C512) for 2.15€ each on ebay. So I'm going to build another fou...
by Rolo
Mon Jun 24, 2013 7:53 pm
Forum: Hints and Tips
Topic: Shift or Rotate from Dragon BASIC
Replies: 18
Views: 3506

Re: Shift or Rotate from Dragon BASIC

I never saw a single 8-bit Microsoft Basic interpreter with shift or rotate operators. We did not need this ;) . We would use integer numbers if possible and divide by two or multiply with two. Of course this does only make sense with integers, not floating point numbers.
by Rolo
Mon Jun 24, 2013 7:37 pm
Forum: Hints and Tips
Topic: Introducing: Dragon multi-cartridge for roms
Replies: 16
Views: 8428

Re: Introducing: Dragon multi-cartridge for roms

Thanks Rink! Well, I did not think of costs in the first place. I built the whole thing around old components, I had in the drawer. You can see that, if you look at the eproms (quite old NMOS chips), which I pulled off some old PC boards or something, time ago. But they are not extremly expensive: 2...
by Rolo
Sun Jun 23, 2013 8:43 pm
Forum: Hints and Tips
Topic: Introducing: Dragon multi-cartridge for roms
Replies: 16
Views: 8428

Re: Introducing: Dragon multi-cartridge for roms

Aha, thanks for the quick reply!
So I will just go on trying some of the rom images from time to time and hope and see...
by Rolo
Sun Jun 23, 2013 8:21 pm
Forum: Dragon General
Topic: I/O Cartridge (Show and Tell)
Replies: 24
Views: 6064

Re: I/O Cartridge (Show and Tell)

Nice board Rink! Seems like nobody is using the Dragon as a controller? Not much discussion going on, hmm. Anyway, good idea for controlling toys like Fischertechnik, LEGO or Märklin. Or how about an "eight channel sound card"? Maybe STEREO: 4 left, 4 right. (You could start a synthesizer demo scene...
by Rolo
Sun Jun 23, 2013 7:50 pm
Forum: Hints and Tips
Topic: Introducing: Dragon multi-cartridge for roms
Replies: 16
Views: 8428

Introducing: Dragon multi-cartridge for roms

Hi guys, I just wanted to show you the just finished prototype of my Dragon multi-cartridge (we were discussing it a few month ago). :mrgreen: You'll probably won't like the design, because it's plain green, but that was the cheapest solution (and a can of paint is easy to obtain). And back in the d...
by Rolo
Wed Apr 24, 2013 12:18 am
Forum: Hints and Tips
Topic: Upgrading 32K -> 64K RAM
Replies: 0
Views: 930

Upgrading 32K -> 64K RAM

I successfully upgraded my Dragon 32 to 64 kBytes, as described in the very good article of R. W. Hall (1985) in the "publications/technical"-section of the Dragon Archive. :D I just wanted to write down a short summary for people who may have the same plan. That was kind of a brutal job, to cut of ...
by Rolo
Wed Apr 10, 2013 2:38 pm
Forum: Hints and Tips
Topic: HxC SD Floppy Emulator
Replies: 15
Views: 3925

Re: HxC SD Floppy Emulator

Did you keep a list of the problematic wave files and if so will you post that list? Hmmm, not really. I should have done so... Anyway, I've just converted a limited number of programs, yet. There is a short signal dropout in "Dragon Data Ltd - Lunar Rover Patrol [exec].wav" at 1:58 that produces a...
by Rolo
Wed Apr 10, 2013 1:48 pm
Forum: Hints and Tips
Topic: HxC SD Floppy Emulator
Replies: 15
Views: 3925

Re: HxC SD Floppy Emulator

Always wanted one of those emulators - but can never justify the expense. Well, the emulator in the deluxe-version with housing ships for 102,99€. Back in the day we paid more for real floppy drives. The Commodore 1541 was sold for about 700 DM in Germany back in 1983. That was considerably more :o...
by Rolo
Mon Apr 08, 2013 8:06 pm
Forum: Hints and Tips
Topic: Schematics of Dragon Cartridges?
Replies: 23
Views: 5751

Re: Schematics of Dragon Cartridges?

Probably depends on which part of the world you live in. There are a few interesting wikipedia articles about that. Until the late seventies, there where those German kind of flat (semicircular) symbols I tend to use. The British and the Americans used symbols, which had fancy corners and were a bit...