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Interesting measurements Stew! I assume those were all bare-machine, no disk interface and on factory original 4700uFs?

The TO-3 packaged switch mode converters ... this looks like them...

https://www.ezsbc.com/index.php/psu5.html

Too tempting not to try, have ordered a couple.

I'm inclined to agree with Mr. Orchard here... measurements under load are key. I don't even know what some of your franken-dragons might draw on the 5V line, but on my oldest, most heavily used and customised machine power up is unreliable (won't boot, works after reset) with its original power boa...

Hi Pere, I think it's probably most useful for real hardware scenarios, as you say. I have been looking for a real hardware options for some time, and this looks useful. I understand also that there is a Nitros9 module, though whether it can work in L1 may be an issue, but it's a very interesting pr...

I just came across this thread... wow, another excellent Dragon tool! To make it even more worthwhile, the NoICE author loves the 6809 and 6309 so much that, unlike every other CPU the project supports, he will offer the license for 6809 and 6309 for free if you simply email him and let him know abo...

The main parts of a next generation Dragon are effectively in existence right now... A 6309 machine, with CoCoSDC and V9958 based Graphics. Keeping the SAM/VDG keeps backwards compatibility. Add something that gives CoCo3 style paged memory capability - like Tormod's MOOH, or the still vaporware CoC...

Yeah, Wordpak 2+ and multipak emulation for the Dragon in Mame will be nice wins. Thanks Pernod!

This is interesting - I have a Dragon 32 which I've just acquired that displays EXACTLY the same symptom.

It boots normally, then after a very short time, the screen instantly changes colour set and clears.

Haven't had time to investigate further, certainly a strange one.

Hello Ian and welcome! If you are on Facebook, you may find some interesting bits and pieces in the Dragon 32/64 Owners/Users Facebook group. It has a fair amount of daily activity. We now have an annual Dragon meetup too, which has been at the Centre for Computing History in Cambridge in previous y...

Hi RedBlueFlame, Reading the directory entries can be done from BASIC by getting raw disk sectors in the directory area using the DragonDOS sector read commands. SREAD is the command, and it takes a drive number, track number and sector number, and two string variables as parameter: SREAD 1,20,3,S1$...

Some excellent hacking there!