Difference between revisions of "Solid State Music SB1"
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[[File:SSM SB1 Schematic.png|600px]] | [[File:SSM SB1 Schematic.png|600px]] | ||
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| + | ==Proprietary SSM 2000 - mystery chip== | ||
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| + | Check out the schematic shortly before the audio out. You'll find a 14 pin DIP chip marked SSM 2000. It is billed as a 'propitiatory chip' I doubt that Solid State Music was a company with enough capital and demand to create a custom chip. I suspect it was a re branded chip of some sort. In the schematic it looks like a couple op amps with null offsets like LM741. Note that the envelope comes into the opamp as a null offset while the waveform comes in the + input. | ||
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| + | Can anyone hazard a guess as to what this chip is? I suspect it may be a problem on my two remaining non functioning SB1 boards. | ||
==Repairs== | ==Repairs== | ||
Revision as of 20:46, 8 July 2015
Contents
Solid State Music SB1 Music Synthesizer Board
From the SSM SB1 manual: "The Synthesizer Board (SB1) is a waveform generator card designed to interface with any computer that supports the S-100 bus and its signals."
I have six of these SB1 cards two (2) of them working to specification.
Wanted to buy I'd like to have a full set of eight (8) SB1 boards. Most of the .MUS music files I have utilize up to the full compliment of eight boards to play all channels in real time.. Please use the contact form to communicate with me if you have any SB1 cards you're willing to part with.
Historical press
"Computer music is real with the new SB1 music board" New Product Announcment see 3rd page (originally 86). The 'mystery' SSM 2000 propriety chip is mentioned. I suspect (or hope) it is a repackaged op amp. "The SB1 music board incorporates a proprietary synthesizer IC, SSM-2000, developed by Solid State Music."
Restoration history
- (07/08/2015) Created Demonstration .mp3 and documented in this wiki.
- (07/06/2015) Score some more! Yet another working to specification for a total of 4 out of 6
- (06/14/2015) Score! I got one more for a total of three working to specifications.
Documentation
SSM SB1 Product manual download
Demonstration
This is the 'studio' I used to create the following recording. It's an Imsai S-100 running Josh Bendason's JAIR CPU with four (4) SB1 boards. Note: One card in extender. The music is encoded with eight (8) channels. I recorded the first four channels through a Mackie ProFx12 mixer with alternating channels primarily panned left and right and recorded using audacity on Windows 7. I then readdressed the four SB1 cards to channels four through seven recording another stereo track that was synced with the first track and exported to create an eight channel recording of Scott Joplin The Entertainer.. (<-- click the file name in the next screen to play, while I think about installing an mp3 player in my mediawiki)
Schematic
It's not pretty (yet) but this schematic is legible. <guilt> I uploaded a better image, still imperfect but better. </guilt> Might want to ask some questions, a one page schematic will be easier to read.
Proprietary SSM 2000 - mystery chip
Check out the schematic shortly before the audio out. You'll find a 14 pin DIP chip marked SSM 2000. It is billed as a 'propitiatory chip' I doubt that Solid State Music was a company with enough capital and demand to create a custom chip. I suspect it was a re branded chip of some sort. In the schematic it looks like a couple op amps with null offsets like LM741. Note that the envelope comes into the opamp as a null offset while the waveform comes in the + input.
Can anyone hazard a guess as to what this chip is? I suspect it may be a problem on my two remaining non functioning SB1 boards.
Repairs
Wanted to make some proper connector cables for the boards. With the help of some folks on the N8VEM-S100 google groups I was able to find some likely candidates for the connectors and order them up from Digi-Key.
