archive.worldofdragon.org

The power regulator is REG 3 - a 7905CT if anyone has any spare - I only have 7805 regulators I can't read the C11 capacitor I believe you should be able to get the 7905 from the local Maplins (if you have one near you). I think the scans of the circuit diagrams for the various Dragon boards are in...

Probably a bit tricky, but how about detecting the address of the appropriate ROM routines, then asserting (pull low) DSD (EXTMEM on the circuit diagrams) to disable device select, and instead map it to some part of your own ROM? You'd presumably need some regular cart ROM anyway to provide the fac...

In the end, the Dragon receives the audio data at a given point. I think the best thing to do would be to use a small microcontroller that renders the tap file to audio signal and outputs that to the tape connector of the Dragon. Well if you are going to do it that way, saving the audio to a Cd wou...

As most software is on tape format, is there a way to convert it to disk so that it can be used with the floppy emulator? I keep thinking about trying to develop a cart that could have something modern SD/MMC/IDE/CF etc as a storage medium and use that to read cas files instead of loading from tape...

rolfmichelsen wrote:After loading a machine code file from a DragonDos diskette:

start = PEEK(&H652)*256 + PEEK(&H653)
end = PEEK(&H654)*256 + PEEK(&H655) + start

And therefore :

length = PEEK(&H654)*256 + PEEK(&H655)

Phill.

dragondata wrote:

prime wrote:I've tested the board with the Alpha and it seems to work perfectly with that too.

Did it need a cable mod due to the Alphas different drive select pins?

Nope, just worked when jumpered as drive 0, same is true actually of a standard 3.5" drive I hooked up too.

Cheers.

Phill.

I've tested the board with the Alpha and it seems to work perfectly with that too.

Cheers.

Phill.

The biggest challenge is getting a 5v power supply to the device - it uses a standard 3.5" floppy power connector so making up a cable to supply 5v from something isn't going to be that hard - might even be possible to get the Dragon to supply the 5v. How much does it draw, should be possible to ad...

I believe that the signals from the PIA that are used on the CoCo by it's serial port are available on the paralell port of the Dragon. So it may be possible with suitable level converters e.g. MAX232, to communicate this way be porting the CoCo drivewire software to the Dragon.

Cheers.

Phill.

I will be adding two VDK tools plus source code shortly to the download area that can add/remove the VDK header... Would those be addvdk and rmvdk :) If so hold of and I'll email you the latest version of rmvdk.c as I had to patch it for modern gcc..... Please, those who bought one confirm which VD...