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Hi Pere, You're doing some top methodical work here! On the 'other' descriptors front... I think Bob is referring to descriptors for whatever drives you have, so a single or twin drive 40 track single sided system would include only /d0 and /d1 if required. If someone had more drives... more descrip...

Not really... it's a bit of a mystery. My first thought was of Prof Hannah @fryrsquared Fry's latest video! But I hope Adrian gets the board going.

And for completeness, the non-Dragon-y 6809 MMUs are largely documented here: https://haserin09-la-coocan-jp.translate.goog/os9_mmu.html?_x_tr_sl=ja&_x_tr_tl=en&_x_tr_hl=en-US&_x_tr_pto=wapp With some more info on some of these machines (and a few others, some with, some without memory above 64k) he...

OK, don't bite me...

https://docs.google.com/spreadsheets/d/ ... ingle=true

I'm not really clued up on the CoCoMemJr's feature set or low level implementation details, but for the other memory expansions I can put together a comparison. Generally, these things fall into a couple of different groups: There are 'additional offboard memory' and 'on mainboard memory upgrade' ap...

Hi Kepler, As John's pretty much updated you on these machines history, there's not a huge amounr I can add. Bob designed 3 or perhaps more different MMU modification versions. They were documented in a series of fragmented, error-strewn (thanks Ed) and rather difficult to follow articles in Dragon ...

Hitek keyboard sticking down keys normally means that the key-slider is split, so check that first of all. You may have to pull spares from a junk keyboard and try and replace them in your good-ish board. Note... pulling them without damaging them is hard!

Yes, I hope to be!

Hi all, After bugging Ciaran to add a new feature to xroar trace output, I finally got around to making the bits and pieces to allow the output to be used nicely: xroar-trace-profiler is a couple of little tools that allow you to profile what exactly is taking up all the time when your Dragon/Coco (...

A little utility I wrote to use when I want to flatten a VDK into a DSK or JVC.

https://github.com/bluearcus/vdk2dsk