Search found 316 matches

by simonm
Sat May 14, 2016 1:55 am
Forum: 32-bit acorn hardware
Topic: Using floppy IDE connection on A5000 for a CF card
Replies: 20
Views: 2889

Using floppy IDE connection on A5000 for a CF card

Hi all, I know that backup is a common topic so I've read up on some older threads that have enlightened me a bit. I've recently brought my old A5000 out of storage, seems I got off lightly with the battery corrosion as it didn't leak much and has now been removed. Happily the machine still works (f...
by simonm
Fri May 13, 2016 10:04 pm
Forum: new projects and releases: demoscene
Topic: Beeb MOD Player
Replies: 72
Views: 7609

Re: Beeb MOD Player

Here's a zip with some more converted VGM's for you to play with. All of the beeb ones are resampled to 50Hz update intervals. Bear in mind my conversion script still has a few snags in it, and also some of the tunes need faster than 50Hz updates to sound ok. Mission is particularly monstrous in its...
by simonm
Fri May 13, 2016 9:43 pm
Forum: new projects and releases: demoscene
Topic: Beeb MOD Player
Replies: 72
Views: 7609

Re: Beeb MOD Player

Sure - here you go. There's two VGMs - one is the NTSC clocked original, and the other is the version I've re-tuned to 4Mhz.
I used Deflemask to create the VGM. Quite a handy tracker, but it only exports VGM, it doesn't load them, so I've included the DMF project file as well.
by simonm
Thu May 12, 2016 10:46 pm
Forum: new projects and releases: demoscene
Topic: Beeb MOD Player
Replies: 72
Views: 7609

Re: Beeb MOD Player

Doh. In fact I'm convinced of this now. I've filtered down to just channels 2+3 in the VGM and I can hear all kinds of other effects going on - it's one of those fancy tracks where they are rapidly interleaving tuned periodic noise with regular melody tones on channel 2. So I'm fairly sure the tunin...
by simonm
Thu May 12, 2016 10:24 pm
Forum: new projects and releases: demoscene
Topic: Beeb MOD Player
Replies: 72
Views: 7609

Re: Beeb MOD Player

Nice one Rich, thanks for the extra insight.
Annoyingly, my test VGM sounds pitch perfect. Maybe the VGM I'm working with (admittedly quite a complex tune) has some other state I'm somehow processing incorrectly. Hmmm.... this wasn't supposed to take so much of my time up... ! Fun tho.
by simonm
Thu May 12, 2016 9:18 pm
Forum: new projects and releases: demoscene
Topic: Beeb MOD Player
Replies: 72
Views: 7609

Re: Beeb MOD Player

Its a tempting idea. I think I'll do something like this; or maybe synthesize a VGM with some specific test tones in it. FWIW I've narrowed the problem down to the shift register being 15 bits on a beeb rather than 16 - if I export my NTSC VGM retuned at 4Mhz but leaving the shift register as 16-bit...
by simonm
Thu May 12, 2016 12:55 pm
Forum: new projects and releases: demoscene
Topic: Beeb MOD Player
Replies: 72
Views: 7609

Re: Beeb MOD Player

It's a good thought. I've studied a few SN emulation implementations (not the jsbeeb one so far tho, so thats handy too), but they tend to focus on simulating outputs at the chip level, and I confess I'm no expert audio/hardware engineer so getting from emulated code to frequency adjustments is prov...
by simonm
Thu May 12, 2016 11:18 am
Forum: new projects and releases: demoscene
Topic: Beeb MOD Player
Replies: 72
Views: 7609

Re: Beeb MOD Player

I'm thinking I should probably take this chat over to the RS forums? How do you guys choose which board to post on? Is RS more suited for tech chats?
by simonm
Thu May 12, 2016 11:06 am
Forum: new projects and releases: demoscene
Topic: Beeb MOD Player
Replies: 72
Views: 7609

Re: Beeb MOD Player

Hmm.. really scratching my head with this periodic noise re-tuning bit, so any more brains on this would be super helpful. It seems a general application of 6.25% detune isn't correct (tuning is out at lower notes, correct in mid-range and out on higher notes). Here's how I understand things: If the...
by simonm
Wed May 11, 2016 11:06 pm
Forum: new projects and releases: demoscene
Topic: Beeb MOD Player
Replies: 72
Views: 7609

Re: Beeb MOD Player

Ok managed to get the pitch re-tuned for beeb clock speed and thats ok, but any tunes that use the periodic noise as a bass effect is proving tricky. I've detuned channel 2 by a futher 6.25% if the volume is off on channel2 and channel 3 is playing periodic noise to compensate for the missing bit in...
by simonm
Wed May 11, 2016 1:29 pm
Forum: introduce yourself
Topic: Hello peeps
Replies: 15
Views: 1998

Re: Hello peeps

Friendly bunch! Hi all.
@Kieran - not ignoring your PM mate, forum has that feature disabled for me atm.
by simonm
Wed May 11, 2016 1:27 pm
Forum: new projects and releases: demoscene
Topic: Beeb MOD Player
Replies: 72
Views: 7609

Re: Beeb MOD Player

If you look at the viewer I posted near the top of the thread mentioned above, it does the note frequency conversion - just a simple multiply and divide ;with a little rounding for good measure. Awesome, thanks! I'll take a look. I've attached a VGM I converted to 60Hz initially, and run through Ki...
by simonm
Wed May 11, 2016 2:07 am
Forum: introduce yourself
Topic: Hello peeps
Replies: 15
Views: 1998

Re: Hello peeps

Welcome Simon !! Any chance you restart a bit of hacking ? I'd like to find where the filling routines are in Chocks Away to use mine instead ... Heh! :) I wrote a gouraud triangle shader on the arc back in the 90's (Inspired by zarch and doom and all that) and it wasn't too bad performance wise. T...
by simonm
Wed May 11, 2016 1:51 am
Forum: new projects and releases: demoscene
Topic: Beeb MOD Player
Replies: 72
Views: 7609

Re: Beeb MOD Player

Fascinating stuff Sarah, thanks for sharing! I think for a humble 2Mhz 8-bit machine that's quite a feat. Kieran - I think I've been on a similar odyssey to you guys! That link is a good read. I stumbled on the VGM player in the CRTC demo and also your player too. Both very cool. I liked how you int...
by simonm
Tue May 10, 2016 6:14 pm
Forum: introduce yourself
Topic: Hello peeps
Replies: 15
Views: 1998

Hello peeps

Hi guys, as a long time reader/lurker, thought it was about time I joined the party. Brill to see so much enthusiasm for the old Acorn micros; very much a theme of my youth - had a beeb and A5000 back in the day, and learning 6502/ARM code got me a job as a software dev so all that time hacking prot...
by simonm
Tue May 10, 2016 6:06 pm
Forum: new projects and releases: demoscene
Topic: Beeb MOD Player
Replies: 72
Views: 7609

Re: Beeb MOD Player

Bit of thread resurrection - Sarah I'm very interested in seeing how you went about implementing your mod player. Your demo disk is awesome. Would you be open to sharing the source code? I'm currently noodling with some vgm playback code and audio in general, and the idea of a mod tracker player is ...

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