mycall2 days ago
What makes the SID chip special are the analog filters. Otherwise, it is easy to emulate as the video shows. MIDISID 4 and Elektron SidStation can access the filters for a wide range of sounds.
layer82 days ago
SID piece from the beginning of the video: https://www.youtube.com/watch?v=YIA_0cvS2gQ
CalRobert2 days ago
Long shot but who knows…
There was an awesome c64 music radio show on KDVS (the UC Davis radio station) back in the nineties, but I can find zero record of it existing. Does anyone on this thread know anything about it, or even perhaps have recordings?
gwittela day ago
Yes. I remember listening to it on the radio. The DJ used the handle Hard Hat Mack. It was pretty awesome to hear SID music over the radio.
I found this archive that has some of the shows recorded, and set playlists (I'm giving two links as the site is using frames so the top level page requires you navigate the menus to get to these):
- Recordings: https://www.transbyte.org/SID/KDVS.html
- Playlists: https://www.transbyte.org/SID/6581.html
- https://www.mmnt.net/db/0/0/arnold.c64.org/pub/sidmusic/lala/ra
- https://archive.org/download/arnold.c64.org (download the whole thing and dig into pub/sidmusic/lala/ra)
Its possible the authors are still around and have more copies; doubtful KDVS has archives, maybe tapes buried in the library.
Anyway, hope this helps! Its a cool piece of history and brings back a few memories.
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phendrenad22 days ago
I wonder how hard it would be to make a SID using transistors, capacitors, resistors. The fact that no one has done it makes me think it's just too difficult.
NobodyNada2 days ago
Similar idea: https://monster6502.com/
But note:
> Does it run at the full speed of an original 6502 chip?
> No; it's relatively slow. The MOnSter 6502 runs at about 1/20th the speed of the original, thanks to the much larger capacitance of the design. The maximum reliable clock rate is around 50 kHz. The primary limit to the clock speed is the gate capacitance of the MOSFETs that we are using, which is much larger than the capacitance of the MOSFETs on an original 6502 die.
So if you built a SID using the same techniques and components, you couldn't run it in real-time without the pitch being way too low or without modifying the design. I'm not sure how hard this would be to avoid with better-spec'd components, but intuitively it makes sense for a much larger circuit to run much slower.
Neywiny2 days ago
A light googlin says estimates are that the SID is maybe 2k transistors. I think a reasonable minimum is in the thousands.
snvzz2 days ago
logic could be in a CPLD or FPGA, leaving only the analog portion discrete.
unwinda day ago
At the speeds in question, I'm pretty sure the logic could be in a general-purpose microcontroller, too. But I'm not sure detailed schematics for the analog parts are available/open.
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LouDNL2 days ago
Each one would fit perfectly on USBSID-Pico
MomsAVoxell2 days ago
Imagine a stack of 4 of them, nicely multi-timbral...
vardumpa day ago
No need to imagine, just listen to this: https://youtu.be/nhz3vHYX0E0
Ok, 8 SID chips, but it sounds amazing.