archive.worldofdragon.org

I had a look too. From 0x600 up to 4k it is all FF which is unused ROM. From 4k to 8k it is all B4 which I guess is reading from nowhere. The 0x10 at 8k is probably a wrap-around to address 0 which also has 0x10 - the cartridge ROM is 4k, its address decoding is 8k, but the CTS* line enables it on t...

The owner/admin of this site is Simon, but he does not have time to work much on it. The site being a wiki it should be easy for all of us to contribute though. Having some "featured content" on the front page would be nice. I believe the front page requires special privileges for editing, and I don...

I have used the monitor output on a Dragon 32 successfully on a relatively new Philips LCD television set (SCART input) at my parents place, can't remember the model, and an Acer AL1731 LCD monitor with composite input (RCA). While hunting for an LCD monitor with composite input I noted down a numbe...

I just read the Coco wikipedia article , and I think this quote is appropriate here :) The precise timing loops made the CoCo useful for laboratory purposes. Since it has no operating system servicing interrupts, it can do precisely timed read-modify write operations for scientific instrumentation, ...

WhizzBang wrote:I'd brought it back to our house, then realised we don't have a CRT screen to connect it to.

You know you can connect the Dragon to an LCD monitor or modern television set if they have composite input (the yellow RCA, or SCART)?

BTW, WRT shipping, I assume you are in the UK?

I'd suggest to use male headers on the board. Then you can use wide, female headers for more permanent setups, or just Dupont wires for prototyping. Dupont wires and headers are nearly for free on eBay. Rolo's headers with screws are perfect on the front-end, where stuff/sensors/relays etc are conne...

Thanks. Are you willing to share your exact dimensions? I am looking at the full size picture from http://archive.worldofdragon.org/index.php?title=Game_Cartridges and when I measure on my screen it looks like the PCB edge margins are symmetric (measured from the 2 narrow pads in the middle). Though...

Hi Rink, A very nice and inspiring project! I see on the photos that your cartridge edge connector design is not symmetrical, the right side margin (outside the metallized pad) is wider than the left side one (when looking towards the Dragon). Where did you take the exact dimensions from? A real Dra...

I found a number of interesting (Coco) programs at http://www.cs.unc.edu/~yakowenk/coco.html and one of them, SAMDISP.BAS, does right shift in Basic by dividing by 2 and INT'ing the result. Maybe the INT makes all the difference.

I was going to suggest that you load the RAMTEST program at another location, since you might hit exactly the bad RAM when you load it, and the BASIC programs you have tried might load somewhere else. But then I tested it myself in xroar and saw that it was not relocatable. Since I also was curious ...