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Good bug hunting work Paul, and very thorough testing! I'll be happy to test the new version on my Acorns next weekend (away from home 'til then unfortunately). If you do still get problems, there are another few options to consider - the first being to force VIDC into a known low-bandwidth state eg...

On second thoughts, I think I have that wrong. I'll need to account for HBSR>HDSR as HBSR and HBER will need to change together to keep the display width the same. That vastly complicates the code as it will need to shift the words right 2, 4 or 6 pixels in a 4 bpp MODE. Yes, it was a real pain BIT...

Also, could you please take a look at the two tracker files in Mad Professor Mariarti (ARCPROFMUS, MPTITLMUS), neither play with QTM. Jon, I don't know what version of QTM these don't play on - I've tried the current release and several old QTM versions, and all play these files perfectly... I'm us...

Since you started extending the format support, I may as well list all the knowledge I collected about the ProTracker like formats: Offset &43C: CHNx FastTracker x channels CHxx FastTracker xx channels FAxx DigitalTracker xx channels FLTx StarTrekker 4/8 channels, the 8 ch patterns are store as...

Hi Jon, I emailed you on Tuesday, but not sure if your email is working - as I got a 'message undeliverable' error later in the week - just spotted it. I've put the dev version of QTMv1.45 on the ftp. All documentation is in there. You need to have a quick look at the ReadChannelData SWI, and correc...

For a really good spot that this is how JP works - load it up, start a game, watch as the screen scrolls left/right during the mission briefing... Look at the bottom left corner of the display. You see on the bottom left corner, a single row of corrupted pixels appear and disappear as the screen scr...

Have to be careful here. JP may use a 300 width 4bpp *apparent* visible screen...however it generates this by using a 320 pixel wide frame area (HDER-HDSR), and reducing the visible size by moving the screen borders inwards. This is the way to implement hardware horizontal scrolling on VIDC1: For ex...

v1.44b now available Lots of work tonight - added compatibility with two new formats! FastTracker 8 channel and FastTracker 6 channel formats. Also fixed a bug in the memory-transfer loading of 8-channel mods (calculated length incorrectly). On the dev site now, with a couple of example FastTracker ...

And I'd love to get rid of the unrolled loops in QTM which you pointed out - indeed the plan was already in my QTMFuture docs (near the bottom if you didn't spot it). It was this highly optimised unrolled looping code, along with other features such as pre-converting all sample to log (rather than d...

Good stuff! I'm particularly keen to see if Mus2QTM runs successfully on 4-channels now, using QTM_PlaySample with R0=-1... I realise now that the automatic channel selection feature has never been fully 'real life' tested - the only game which uses it (that I know of) uses the 8-channel trick you f...