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#21 | |||||
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Join Date: Mar 2018
Location: Hastings, New Zealand
Posts: 2,735
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No. The reason we have so much awesome Amiga music is that it didn't have old 8 bit sound chips in it. Quote:
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But today it's different. We already have a vast library of Amiga software, and many of us are interested in playing with other sound chips without having to change platforms. So now is the right time to think about adding them to the Amiga. Quote:
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The A1200 is a bit of a conundrum because while it has several interface options, they might already be taken up by something else. IDE port probably has a hard drive or two on it, PCMCIA might have a network card or CF Card plugged in, clockport might have an RTC or other device in it. I am leaning towards the clock port because it is spare on many machines, expanders are available, and it has most of the signals required. You just need one more address line and +12V - which can easily be applied via separate jumper wires. For a solution that works on any Amiga you could use the parallel port. One of the printer control lines would be toggled to indicate address or data, and the other two used for chip selection. With the SID you might need a latch to hold the address, while the YM2149 already uses a multiplexed bus so it doesn't need separate address lines (just 1 line for address/data muxing). The circuit would need to be externally powered, perhaps via the disk drive port or using an external power supply. The box could also be used to pass through the Amiga's stereo sound output while mixing SID/AY sound in with it. |
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#22 |
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Join Date: Mar 2021
Location: Avellino, Italy
Posts: 170
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It has already been done in the late 90s, early 2000s. The amiga version of the catweasel has the option of connecting a sid chip to the clockport and playsid library can make use of it. We could RE that part of the catweasel and already have the software to play with it.
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#23 | |
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Join Date: Jun 2010
Location: PL?
Posts: 2,878
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And +12V can be produced from +5V so no additional power line required (modern DC/DC boost regulators can be made audio friendly). But to be honest i see lot of Amiga users unhappy because they use parallel port for audio sampler, printer, SD card, Ethernet card, video digitizer etc... ![]() |
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#24 |
Registered User
Join Date: Mar 2021
Location: Avellino, Italy
Posts: 170
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Hi, I found this:
Code:
https://github.com/atbrask/RealSIDShield |
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#25 | |
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Join Date: Sep 2004
Location: Poland
Posts: 1,305
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Sadly, Yes. My last Amiga (before this which I have now) was one big sandwich in tower box. Since that I'm not consider this option as good idea.
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#26 | |
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Join Date: Mar 2018
Location: Hastings, New Zealand
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One interesting aspect of the design is that it uses a latch to multiplex the SID address and data coming from the ATmega MCU. Apart from the SID clock only 3 control signals are required, so it might also be possible to control this shield directly from the Amiga's parallel port. |
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#27 | |
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Join Date: Jun 2010
Location: PL?
Posts: 2,878
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Buffered IDE splitter? |
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#28 | |
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Join Date: Jun 2010
Location: PL?
Posts: 2,878
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#29 |
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Join Date: Sep 2004
Location: Poland
Posts: 1,305
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Are You sure It would be compatible with all of them? Not to mention You must "steal" some transfer and addresses to handle such device. Clockport is way better option, because it's designed for various extensions.
Moreover I have two SIDBlasters (one with 6581R4AR and one with 8580R5) and it's in size similar to RTC unit. So it might be very small device just to clockport. I'm wondering if 2SID or even 3SID interface would be much bigger. |
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#30 | |
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Join Date: Mar 2021
Location: Avellino, Italy
Posts: 170
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#31 | |
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Join Date: Jun 2010
Location: PL?
Posts: 2,878
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of course you can use clock port or even add missing components to the PCB and make clock port 16 bit... Personally i would rather prefer external solution with interface (USB? Serial?) so SID can be hooked not only to Amiga but also for example to the PC (unused serial port on 8520 can be used to deal with Amiga UART limitations). |
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