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Re: BBC Tube WIP [Re: Pernod] #117643 08/08/20 04:57 PM
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Pernod Offline OP
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I'm in need of some assistance with a device I'm working on ...

It's the Hybrid Music 5000 Synthesiser, schematic at https://www.retro-kit.co.uk/user/cu...chnologyHTMusicSynthesiser-Schematic.pdf

My initial implementation was a port from another emulator, and worked well, and in stereo. I'm now updating it to make use of the DAC76 device (Am6070 on schematic), but the current DAC76 only supports a single output channel whereas the Music 5000 uses both decode and encode outputs switched by the EnD input line.

So the DAC76 device requires another input line ed_w, no problem. I'm not sure how sound_stream_update should be changed to output to both channels though, depending on state of the EnD line. My limited knowledge of the sound system suggests the device can only output to either decode or encode at any time, but wouldn't sound_stream_update need to update both channels? Anyone suggest how this should be implemented?


BBC Model B, ATPL Sidewise, Acorn Speech, 2xWatford Floppy Drives, AMX Mouse, Viglen case, etc.
Re: BBC Tube WIP [Re: Pernod] #117795 09/08/20 12:02 PM
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Pernod Offline OP
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Here's a BBC Master with a 10MB Acorn Winchester and ARM7TDMI co-processor running at 64MHz attached, running Frontier! (albeit only at about 40%)

Also has VideoNuLA fitted for the enhanced palette.
[Linked Image from i.imgur.com]
[Linked Image from i.imgur.com]
[Linked Image from i.imgur.com]
[Linked Image from i.imgur.com]
[Linked Image from i.imgur.com]
[Linked Image from i.imgur.com]
[Linked Image from i.imgur.com]


BBC Model B, ATPL Sidewise, Acorn Speech, 2xWatford Floppy Drives, AMX Mouse, Viglen case, etc.
Re: BBC Tube WIP [Re: Pernod] #117800 09/08/20 01:47 PM
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Duke Offline
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Very cool! You should make a video of it running smile

Re: BBC Tube WIP [Re: Duke] #117802 09/08/20 03:12 PM
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Pernod Offline OP
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Originally Posted by Duke
Very cool! You should make a video of it running smile

Thanks, I've never really played Frontier though did have it on the Amiga back in the 90's. Will consider a video when I'm happy with the emulation, want to get a little more performance out of it.

I should add that this is a port of the ST version, and has to run from the Winchester as the executable is 2MB which is too large for any Acorn floppy formats.


BBC Model B, ATPL Sidewise, Acorn Speech, 2xWatford Floppy Drives, AMX Mouse, Viglen case, etc.
Re: BBC Tube WIP [Re: Pernod] #117803 09/08/20 04:07 PM
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Just Desserts Offline
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Originally Posted by Pernod
Originally Posted by Duke
Very cool! You should make a video of it running smile

Will consider a video when I'm happy with the emulation, want to get a little more performance out of it.


Just to clarify, if you use -aviwrite and also specify -noafs, then the resulting video will play back full-speed regardless of how slow the emulation is during recording.

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