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A full-blown newb on the way to a POKEY synth


nILS
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  • 3 weeks later...

Tonight, I finished soldering the first mbPokey module. While doing so I found a mistake in the schem and the PCB layout - SO wasn't connected to the POKEY. Which is bad :D I'll check the module again tomorrow and see if I manage to get it to make some noise.

EDIT: I won't be posting pics, as I don't have a digicam handy and it doesn't look all that amazing :D

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Would love to see some pics.

EDIT: This vid might be iof nterest to you.

A guy whos sending FOR statements to the pokey from a microcontroller and coming up with some interesting sounds

He explains it more in the info:

http://ie.youtube.com/watch?v=aRCPOhP-V7M

Some Cool sounds in between the gaps.

I praticularly love from 3:20 onwards

Sounds very aphex-like.

Great for the circuit benders and glitch lovers out there id imagine.

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Will the pokey be able to play full musical intervals, or is it limited as in the Synthcart?

Yes and no. The pokey will play about 4-6 octaves rather accurately. The tuning in some ranges of notes is a bit off due to the divide-by-N counter used for frequency generation.

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Whee! It's working! Thanks so much stryd! I'll upload a little audio/noise file soon.

EDIT:

It didn't work right away for 2 1/2 reasons:

* I noticed the first one while soldering the board - although the schematic looks correct, there's a missing junction, which Eagle didn'T notice either -> J1:SO( 8 ) was not connected to IC:/CS0(30)

* I had an error in the source code of the SR handler (which is a C port of TK's mbSid v1.7 source)

* I had to manually write to the register using MIDIOx as the software doesn't do much yet - and I for some reason sent volume "0", so it wasn't really that surprising no sound would come out of the Pokey ;-)

I'll upload the updated schem and board layout as well as the software later on so whoever want's to get started on building one can do so.

more edit:

Removed accidental smiley :D ( <- this one is intentional)

whee_thumb.png

2031_whee_png1eeb8a87d4b92db27b1f5cadb94

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  • 2 weeks later...
  • 2 weeks later...

i am absolutely stoked about this!  i just stumbled on this thread today and can't wait to build one of my own.  i'm sooo excited!! i have to finish my MbSID first though but that's exciting too! ;D  just as a side note, i would love to get a few PCB's if you do end up with extras for sale!  i've never had my own printed so i wouldn't know what to do.  :)

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  • 1 month later...

hey nILS, i have a question... my oscillator(crystal) has only 2 pins.  do i connect both to Pin #3 of the 74HC74 or just one?  i assume one pin of the crystal goes to GND and the other to VCC?  thanks.  also, the last post you did with code in it, i believe on page 3 of this thread, is that the final app or at least one that will work?

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