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About fallenturtle

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    MIDIbox Newbie
  • Birthday 08/10/1977

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  • Website URL http://fallenturtle.com

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  • Gender Male
  • Location San Francisco
  1. My MIDIBOX SID build is using the MB-6582 main board and a custom control surface. I'm building it inside a VIC-20 case and the control surface is built on a modified keyboard using the keys as buttons. The encoders I got push up through the holes in the keyboard tray. Due to a lack of room I'm not including the matrix. LEDs are placed around the keyboard area and my attached layout shows where I'm thinking of putting them. I went through a bunch of different layout ideas and ultimately went with whats attached. I tried to keep knobs near the edges so i can put labels right next to them. My goal is to have the chosen keycaps represent the button functions, but I'm limited by the fact that I only have a single keycap set. I'm using the old PET style keys so its hard to get extras without paying an arm and leg. Hence I'd love to have two CTRL keys, but I only have one so I'm using A for Osc knobs ENV/MISC/ASSIGN selector. While I think I tried to place everything as optimally as possible, I lack the experience of using these devices so I thought I'd see if any of you seasoned MIDIBOXers might have any thoughts, suggestions, or see any obvious pitfalls I might be missing with what I choose to do. For anyone interested, I'm documenting my progress on a blog on my website: http://www.fallenturtle.com/c64blog Thanks!
  2. water slide decals for commodore case

    Has anyone try using dry transfer (letraset) letters onto a surface like the Commodore 64/VIC case?
  3. water slide decals for commodore case

    I already own a ptouch and with clear tape even, but I think it will have the same issue of looking like a sticker. The laser etch transparent panel might be interesting, depending on its height. Thanks for the link. I didn't realize until I did more research that they make rub offs that can be printed in a laser print, so I'm also considering that since ultimately what I'd like is to have the lettering directly on the case surface and with no shiny transparent margin around them which I think is what I might get with the water transfer technique.
  4. I'm building my synth inside a Commodore VIC-20 case. The LEDs will be poking out of the surface so I'm trying to figure out the best way to apply labels to the case surface. One method I'm considering is using water slide decals which are popular with people who do models and custom guitar gear. The pack of this special paper is $20 so I'm hesitant to buy some if its going fall off or look like crap. Has anyone had any experience trying to use these type of decals on a surface like the commodore cases? My concerns are: 1) while the case is mostly flat, its got a little texture, so I'm wondering if that will lead to the decals falling off. 2) If the case is matte and I'm not planning to apply a clear coat to the top, will the edges of the decals be really obvious and look bad? I'm also open to suggestions on better ways to apply the labels.
  5. Custom control surface for MB-6582

    I revised my sketches. DIN:   DOUT:
  6. Custom control surface for MB-6582

    I'm still working out how I'm arranging the front panel. It's based on a C64* keyboard with the encoders and switches being on the keyboard grid and the LEDs around it coming out of the C64* case surface. See image. Because of this I think none of possible arrangements will work for or against direct wiring vs matrix wiring. I think I'd rather deal with wiring 2 matrices then buy more DIN and DOUT boards and they required components for them (though I do have one DIN module completed from my since abandoned modular MIDIBox SID.   *Actually its a VIC-20 keyboard and case, but I'm pretending is from a C64.
  7. Custom control surface for MB-6582

    Those are pin headers I'm using for going to the switches and the black horizontal things are the diodes.
  8. Custom control surface for MB-6582

    I'll go ahead and add the sinks. I downloading Fritzing to try to mock up the matrix so to get a better visual idea of what I'm doing. Does this mock look like I get the idea? This is for the DIN matrix.
  9. Custom control surface for MB-6582

    If I'm following you correctly it sounds like its easier to create matrix routing on a printed stripboard than direct wire each LED/switch. I was hoping I could just use the DIN and DOUTs that are on the MB-6582 base PCB. I didn't get the BC547s for T2-T9 because I didn't think I needed them if I'm not using the Mod Matrix, but if I AM using JD8, then does that mean I need them after all?
  10. Custom control surface for MB-6582

    Okay, so I will need to buy some 1N4148 diodes? The official control surface PCB is some what of a maze for me... do I put a diode between each switch/LED and JD8?
  11. Custom control surface for MB-6582

    Thanks Peter, That does help, though I'm still a little bit confused and I think it might be related to how I literally wire this up. I guess I was initially thinking I'd run a wire from an LED, LFO1 LED for example, lead to D4 and then another wire from the other LED lead to ground. Am I to understand correctly that I'll want to recreate those matrices shown in the PDFs on a piece of strip board and wire everything through that? Would I want to remove the "16 +" from the DOUT table in the asm file? Actually I realize my understanding of how the PCB connections translate to the asm file are off. For example for LFO1 LED it says:      DOUT_ENTRY  TMP4, 0, 16+3,   3   ; LFO1 LED Which I previously would have thought was JD3 Pin D3, but its actually JD7 and Pin D4 according to the wiring chart. Sorry for being such a dunce!
  12. Custom control surface for MB-6582

    I'm building a MB-6582 based synth, but instead of using the official control surface PCB, I'm making my own surface. It will have all the same buttons, LEDs, and encoders that the official control surface has with the exception of the matrix. So I'm trying to learn how to build out the CS based on the MB-6582 CS but subtracting what I don't need, which has led me to some confusion because I'm a noob: I think I might be getting my matrices confused. Is there only one matrix, or is there the matrix has in the grid of leds and buttons on the control surface and also matrix, as-in a way of connecting inputs and outputs? If I'm not doing the LED matrix, do I need any diodes for the other parts of the control surface or can I just wire everything directing to the DIN/DOUT along the bottom of the MB-6582? Are mb-6582_cs_din_wiring.pdf and mb-6582_cs_dout_wiring.pdf found in the Control Surface Wiring section of http://www.midibox.org/dokuwiki/doku.php?id=wilba_mb_6582 exclusive to the LED/button matrix? Is each JD header on the base PCB (JD1, JD2, JD3) equivalent to a shift register? Would the JD number correspond to the shift register number used in the asm file? If I wanted to keep the same pin assignments that the MB-6582 asm file uses, but without the LED matrix, would I just remove the 16+ part of the shift register assignment? How do I deal with ground? Do I just chain the ground pins of the components per shift register and connect them to the ground pads next in between the the JD headers? Thanks.
  13. Can I use a polar cap for the 330nF cap for C2 on the MB-6582

    It is, in fact, tantalum. Would the marked hole in the attached image be positive (the upper or right of C2)?   Edit: I have to place an order for some parts anyway, a ceramic and non-polar cap is 30 cents, might just do that... its rated to 50V as well instead of the TAP334K035SCS' 35V. I'm not sure why I bought such an expensive cap.
  14. I accidentally ordered a polarized capacitor for the power supply section of the MB-6582 that goes in C2. If I place it the correct direction will I still be able to use it here or do I need to get a non-polarized version?
  15. Advice/feedback at a crossroad: Modular or MB-6582

    So I've ultimately concluded that its not possible to put a MB-6582 in a C64C case while retaining the keyboard (with its PCB attached) because there's not enough vertical space at the front to fit the MB-6582's components. So I'm going to install the synth in a re-labled VIC-20 case. Since I now have an extra 64C case and a keyboard I'm also going to put together a Raspberry Pi "retro" gaming system. :) If anyone is interested, I'm blogging/documenting my progress: http://fallenturtle.com/c64blog