archive.worldofdragon.org

Due to insufficient address decoding, writes to the upper 32K in map type 1 on an unexpanded Dragon 32 cause both the ROM and RAM to be selected. This results in whatever would be in the ROM at that address to appear on the data bus while the RAM is selected for write, causing ROM data to be copied...

I'd avoid PHP wherever possible, but that's something I try not to get into big online debates about ;) Yes, we should NOT get into debates about PHP vs JAVA vs ROR vs C++ vs XYZ. Don't even bring up databases. We're all old enough to know that leads nowhere. Quite so. And I wouldn't argue in favou...

I'd avoid PHP wherever possible, but that's something I try not to get into big online debates about

If you're going to use PHP anyway, is there a specific reason to avoid phpBB? Its security record seems about as good as any other PHP app, and everyone already knows how to use it.

I'm not around them right now, but can check next year.

Definitely getting away from things I actually know anything about now but I'll hazard a guess that capacitor self-discharge rate is temperature-dependent, and as your computer warms up, the discharge rate increases, so less time has to pass before the DRAM (which is just a matrix of capacitors) los...

So, the &HFFD9 mode can only be used for very short periods of time? I guess so - for however long the RAM can go without refresh. Interesting thought though - you should definitely be alright for some short time into the vertical refresh - I think some experimentation is in order :D I don't like t...

Some questions... (1) Is it true that RAM refresh is disabled on Dragon/CoCo machines when running &HFFD9 mode? According to the SAM data sheet, yes. Think of it in terms of the SAM having only two "slots" for RAM accesses - usually one goes to the CPU and one to the VDG. RAM refresh occurs during ...

Happy christmas to all!

Sorry I didn't get you a card...

Thanks! Though the PDF is really thanks to Texinfo - LaTeX for lazy people!

Is... sort-of released. I wanted to get something out before Christmas, so I've thrown the source tarball up, along with the new manual and a Mac OS X build, as I have a Mac here. If I get time before I have to get the train tonight, I'll try for some other builds, otherwise it'll have to be next we...