SC126 vs. sound peripherals

[Joao Miguel Duraes]

I am not very clued up on the Z180 (from an "almost a SOC" perspective), but have read here and there about some caveats that need to be catered for.

With that in mind, I have assembled an SC126, which is working fine on its own with the uSD card adapter Stephen provides with his kit, plus an 8086.net serial adapter. I am running RomWBW 3.6.0 devX (because I frequently update it) with a modified SCZ180_sc126_std config.

I have added (in addition to the uSD adapter) a, RC2014 CF card v2.1 module, which works fine. 

That said, I do not seem to be able to get any YM2149/AY-3-8910 sound card working on it, on any of D8/D0, A0/A1, 50/51 (this one I expected to fail), 20/21 I/O combinations. I have tried two known-working Ed Brindley cards (rev 5 and 6) plus the Why-Em-Ulator. I am of course adjusting my RomWBW config to adapt, and I have thoroughly tested the three RCBUS slots the SC126 has.

Are there any immediate and ovious reasons why these cards might not work on this machine? I though maybe the bus speed, but they all use their own internal oscilator.

Ready for some education :-)

Thanks,

Miguel 

 

[Wayne Warthen]

Hi Miguel,

I am pressed for time right now, but in  a few hours I will check/test my SC126 and report a known working configuration.  In the meantime, here are a few hints:

The Z180 occupies ports C0-FF, so you cannot map anything else there.  So, D8/D0 is not possible on the Z180.  For testing, I suggest using the Ed Brindley Rev. 6 board strapped for MSX (A0/A1).

For now, I recommend using MSX addressing.  I don't think Ed Brindley Rev. 5 can do MSX.

I suggest using the TUNE application for testing.  It should find the board at the MSX addresses.  The TUNE application uses direct to hardware I/O.  It does not utilize the RomWBW API.  So, don't worry about configuring RomWBW to start with.  Just strap the board carefully and try running TUNE.

The Why-Em-Ulator cannot be automatically detected because it does not implement data read functionality.  You can use -MSX on the TUNE command line to force it to use the MSX config even though it cannot detect it.

Thanks, Wayne

[Joao Miguel Duraes]

Thanks Wayne - please don't waste any more time on this. I have figured it out.

I guess I knew everything you said already, but your words inspired me to build a new Rev 6.1 card on 0xA0 (I knew this was the preferred address as we slowly turn our RC2014 more and more into MSXs - it seems! :-) ). I tested it on my RC2014 and it worked fine. I put it on the SC126 and it also worked straight away! Head scratching time.

I then grabbed those other "known working" cards (which as it happens, I had not actually used for a while) and they both had faulty AY chips which I had tested back in the summer! DOH! I left them on the cards and forgot about it. Put in new File KC89C72s chips on them, and they also worked fine. lol...

Thanks,

Miguel 

[Wayne Warthen]

Good news Miguel.  I was not previously aware of the File KC89C72s chips, so I learned something.  😀

Thanks, Wayne

[Joao Miguel Duraes]

To my ears, they sound pretty, pretty close to the AY-3-8910.