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Re: Need help with Philips SAA1099 sound chip.

Posted on 2020-02-25, 14:44

root42 wrote on 2020-02-24, 21:10: Well to be fair: the SSI Innovation was a PC card of the late 80s. It wasn’t widespread, but it was commercially available! I'd obviously love to see SSI-2001 support, as well, but one step at a time! The SAA1099/CMS/Gameblaster is definitely a good choice for a …

Re: borland c++ 2.0 runs with 8088

Posted on 2020-02-25, 14:33

Even Turbo Pascal 7 from 1992 runs on an 8088. While the IDE is slow, the compiler is still reasonably fast. Borland's C and C++ compilers cannot compete with Turbo Pascal's compilation speed, but produce superior code, because Turbo Pascal does not really optimize anything.

Re: Say "Hi!" to the Renovation SSI-2001!

Posted on 2020-02-23, 15:19

Fully agree. I have one of Fagear's SSI-2001 replicas and built a system around it just (ok, mainly) for listening to the HVSC using a real SID. But that's the point: we have Fagear's SSI-2001 replica already and that is using a real SID. Why spend time creating something worse? If SIDs get sparse, …

Re: Need help with Philips SAA1099 sound chip.

Posted on 2020-02-22, 23:02

External clock might be exactly what you need. According to the datasheet, external clock means that it uses the address write pulse as envelope clock pulse, i.e. that it advances in the envelope wave form every time you select a register address. At least that is how I interpret it. You would then …

Re: Say "Hi!" to the Renovation SSI-2001!

Posted on 2020-02-22, 22:21

You know ArmSID ? http://dzi.n.cz/8bit/armsid/index_en.php http://dzi.n.cz/8bit/armsid/imgs/ARMSIDschema.pdf But its not OpenSource. I had heard about it but did not take a closer look until today. The pinout of the chip itself would be similar enough for a layout that supports both, the pin …

Re: CGA "optimal" palette (fantasy)

Posted on 2020-02-20, 21:39

I figured cyan and magenta were chosen because they had a good contrast on amber/green/monochrome screens. (I have no idea if that's actually the case, though.) In fact, cyan and magenta were not really chosen. It is just that you only have two bits per pixel in that mode and since the card outputs …

Re: CGA "optimal" palette (fantasy)

Posted on 2020-02-20, 19:51

Flickering between two CGA palettes might not be the most practical solution for the reasons you already mentioned. This technique would be much more useful in combination with text mode based pseudo graphics. One variant that I personally experimented with a while ago is a text mode with 40 by 100 …

Re: Dro2midi

Posted on 2020-02-20, 19:25

You could create a Github issue and explain your problem there or view his E-mail address on Github, provided that you have a Github account. If you don't, you could clone the repository and look up his E-mail address via git log. This is the DRO2MIDI repository.

Re: Say "Hi!" to the Renovation SSI-2001!

Posted on 2020-02-20, 18:11

if i where benedikt i would go one step further and remove the sid stuff 100% and only keep emulation core. a mockup IC on top of the Emulation Core can be added to hide the magic. To protect C64s from SID Scavengers. While I fully understand the motive, I'm not going to artificially cripple the …

Re: Cloning the AdLib Gold Surround Sound Module

Posted on 2020-02-20, 17:53

Maybe someone can remedy that unfortunate reality at some point. Given the many reproduction projects currently ongoing, would it not be feasible to clone an Adlib Gold as well? The biggest obstacles would be the four-layer board layout and the "GOLD CTRL" gate array or whatever that is. A work- …

Re: Say "Hi!" to the Renovation SSI-2001!

Posted on 2020-02-17, 19:38

What's the reason for the card if you omit the original SID? For the few games that supported the card natively, no one would care, as these games all sounded better with Adlib anyway. The only reason imo to own a replica is to be able to play SID files on it using a real SID instead of SID …

Re: CGA "optimal" palette (fantasy)

Posted on 2020-02-17, 14:26

From the monitor's point of view "I" is not disconnected, but connected to the CGA's "G" output. IIRC an average TTL output should be able to drive at least two TTL inputs, so all should be well. By the way: This is my color remapping code for Tandy/PCJr., EGA and VGA that changes CGA mode 5 to …

Re: Say "Hi!" to the Renovation SSI-2001!

Posted on 2020-02-17, 12:05

What emulation core does it run ? There is no emulation core for it, yet, but I found this project that uses the same chip (the cheap and near-ubiquitous STM32F103C8T6) to play back SID music from its internal flash memory or an SD card. And if the chip is fast enough for 6502 emulation plus SID …

Say "Hi!" to the Renovation SSI-2001!

Posted on 2020-02-16, 22:00

You probably already guessed it: This is another clone card. To everyone that has been following the developments on this forum and knows this thread it is reasonably obvious that this is to a substantial degree based on a combination of picture-based reverse engineering, other people's picture- …

Re: MID-format player for Adlib device ?

Posted on 2020-02-10, 13:50

That's not really possible, simply because FM synthesis doesn't work that way. You can't form a waveform using FM synthesis to resemble an arbitrary sample. Not with the limited operations of the OPL2/3 anyway. What I meant by "provided that FM synthesis can produce the sound in question" is that …

Re: MID-format player for Adlib device ?

Posted on 2020-02-10, 12:59

I'm aware. The thing is that the result of the transform approach could potentially sound vastly superior, provided that FM synthesis can produce the sound in question, and that it would use as little CPU resources as any other FM tune composed for the Adlib.

Re: MID-format player for Adlib device ?

Posted on 2020-02-10, 12:40

RAD has sound samples in it like MOD, S3M ? No, instead of sound samples it contains parameters for OPL2 or OPL3 synthesizer. It is similar to MOD and S3M but uses OPL synthesis instead of PCM sample playback. It should technically be possible to use a sophisticated combination of Fourier …

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