davotron

Yep, thanking you muchly

thanks for the help! Of course it is uploaded, my mistake! I've said that again in my other post :D I'm not sure what was wrong with the PSU I was using, it had insane amounts of ripple or very poor rejection, but changing that pull up definitely fixed it - microchip suggest a 1k - 10k in the datasheet I believe. All voltages/connections are good - although I'm sure one should measure 4.7v DC on the audio output, that the signal rides on, I see more along the lines of 500 mV which is not good! Does that 1k pull down just provide a DC path for the ac coupling cap? I'm not sure what the internals to this pin are and what the output impedance is etc; I THINK it is an open drain output so it probably pulls the drain down. I'll try disconnecting, then measure it. David

Hello, I am a newbie here, it is true, but have toiled with micro's and PICs over the years, but am having problems re-compiling my SID application. I wish to run the MidiboxSID V2 software, and so edited the setup file to accommodate my minimal control surface. I believe I essentially need to build the setup_8580.HEX and send it over SysEx, using MIOS studio, to the core - this seems like the most straight forward method. I run into problems when I try to build the setup_8580.hex file from the assembler file. I firstly tried the "traditional" MPASM method on windows; and after adding all the .inc and .h files to the project, got "symbol not previously defined" (among other) compiler errors. I then switched to GPASM on my mac, and again, after playing with directories and getting .inc and .h files in the right places get the same "symbol not previously defined" errors for various things like "BANKED" and "STATUS". Am I going about this the right way?! i.e. compiling the setup.. file? I'm a bit unsure about the Xcode method, although I'd like to understand it more - I used to use Xcode to basic build audio units, I'm not sure what I'm trying to achieve with Xcode - is it to compile a HEX file or a Sys ex file etc? Any help would be fantastic, it's such a good ongoing project, I wish to get the fundamentals and then expand on it. David

Firstly, hello everyone, I'm a newbie here.. Secondly, after much cogitation and listening to the awesome sounds of the elektron sidstation (but being scared away by the price.. ) I decided to build a simple SID + CORE with a minimal control surface and being an electronic engineer I thought "right, it should be straight forward..", but I have run into a couple of problems; I have built the Core and SID module, and the core is up and running nicely (although I might add I changed the pull up to MCLR to 1k rather than 100R [5mA rather than 50mA I believe flowing out the pin], I found the p18f4585 was getting stuck in a state of constant reset due to a noisy PSU I have, got rid of it though.. and added a reset). I downloaded MIOS to the core easily and the LCD gave me sensible characters, and I get midi comms and can debug using MIOS studio. I hooked the SID module up to the Core and using MIOS studio downloaded the sid test tone app to the core, but don't really get any output. I believe it is there, but very quiet. Using a mic amp with 75 dB's of gain you can hear a tone, albeit with a lot of noise :D and I'm certain it isn't power supply whine or oscillation as it goes away with just MIOS running with no app. Is there a common problem with dead 8580's giving very quiet outputs? I'm not sure the best way to test it - when I run the interconnection test does sending different mod wheel values to the core change the states of the SID address and data pins (i.e. the parallel outputs of the shift registers)?! Secondly, I'm having big problems re-compiling my SID app but I'll go post that in the right place :) Cheers TK for a great project David