archive.worldofdragon.org

Wow, thank you for the response. Seems to be an interesting issue :) Strange enough, on other platforms you can find a variety of cartridges. For the Dragon I could not find any. And the machine was quite popular in England, wasn't it? Yep. I think the main part of the problem concerning carts was ...

You will not be able to write to an EPROM in that way. The EPROMs need a higher programming voltage and signal timings that the Dragon does not provide. You need a proper EPROM programmer to do that. You should be able to write to SRAM connected to the cartridge port. There's no voltage problem - t...

On Friday, I received a box. This was box was quite special to me... I mean, it's a nice enough box, well-constructed, spacious and strong... But it's really what was in the box that matters. And what was in it was something that I've been hoping to get for a long time... A Dragon 200 of my very own...

From what I could tell from the few actual Dragon cartridges I have, most have multiple ROM chips necessitating a more complicated design than you need now. I don't have a schematic handy for mine (will find one though) but I use a single 8Kx8 28 series flash EEPROM which means you can basically get...

No... but I have some home-built ones that just need final tests... so what's up?

Hmmm... mixed opinions about those docs. But designing your own 8-bit computer system from scratch isn't that hard - just a bit time consuming and a little costly if you're getting PCBs made in China every time you want to try something or hit the next "stage" in your build. The way I see it: if you...

I enjoyed reading that - but weirdly, the thing to make me smile was a mention of a dust cover. I'd completely forgotten that people had ever made dust covers for computers.

Cool project there, thanks for linking. Never seen that before.

I recently ended up putting some ram in the cartridge slot and just thinking of some cool ways to use it. If Xroar supported it then I could write the necessary code on my er... lunch breaks...

Yep. - it was a much more interesting time. Back when computers had personality.

Does XRoar assume that an attached cartridge is read only? If so, is there any chance we can have that changed to allow writing to the cartridge images? A real Dragon (and seemingly POKEs from BASIC) will happily attempt a write instruction to 0xC000 if you tell it to. Maybe this could be a command ...