17 Reply by dawsx

(31 replies, posted in Nintendo Handhelds)

Check this thread out: http://chipmusic.org/forums/topic/1443/ … pro-sound/

Unfortunately all of the image links are dead, but from what I could glean, the main problems he had were that 1) there isn't a whole lot of space in the SP where you can fit a new audio port, and 2) because of how the SP handles volume control, the solder points for all of the wires aren't as straightforward as they are in older models. Seems like you're really better off sending it to NeX and letting him handle it if you really want the mod, but you should listen to some of Auxcide's stuff to hear what it sounds like with just an adapter.

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18 Reply by dawsx

(8 replies, posted in Nintendo Handhelds)

I had the same issue when I got mine. You just have to solder the south battery tab to the nearest component to complete the circuit. If the cart is new, the battery itself should be fine.

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19 Reply by dawsx

(21 replies, posted in Nintendo Handhelds)

zerolanding wrote:

A little off topic but, oddly enough the Z80 processor at the core of the dmg has been used in many instruments including famous ones. here is the list of DMG cousins in music:
MIDI sequencers such as E-mu 4060 Polyphonic Keyboard and Sequencer, Zyklus MPS, and Roland MSQ700 were built around the Z80,[citation needed]
MIDI controllers and switches such as Waldorf Midi-Bay MB-15 and others.[citation needed]
Several polyphonic analog synthesizers used it for keyboard-scanning (also wheels, knobs, displays...) and D/A or PWM control of analog levels; in newer designs, sometimes sequencing and/or MIDI-communication. The Z80 was also often involved in the sound generation itself; implementing LFOs, envelope generators and so on. Known examples include:
Sequential Circuits Prophet 5, Prophet 10,[65] Prophet 600, Six-Trak, Multitrak, MAX, and Split-8
MemoryMoog six-voice synthesizer[66]
Oberheim OB-8 eight-voice synthesizer with MIDI
Roland Jupiter-8 eight-voice synthesizer
Digital sampling synthesizers such as the Emulator I, Emulator II, and Akai S700 12-bit Sampler,
as well as drum machines like the E-mu SP-12, E-mu SP-1200, E-mu Drumulator, and the Sequential Circuits Drumtraks, used Z80 processors.
Many Lexicon reverberators (PCM70, LXP15, LXP1, MPX100) used one or more Z80s for user interface and LFO generation where dedicated hardware provided DSP functions.
The ADA MP-1. A MIDI controlled, vacuum tube, guitar pre-amplifier.

Wonder if anybody has scoured the code of any of these devices for anything that could be applied towards synth building?

Well, technically the CPU in the Gameboy isn't a Z80. It's an LR35902, which is based on the Z80, but has less of its functions and a built-in sound synthesizer. Those synths used the Z80 as their core processor, but they had to have used a separate sound chip for the actual synthesis.

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20 Reply by dawsx

(18 replies, posted in Nintendo Handhelds)

Google RGBDS, it's a development kit for Windows, I use for homebrew programming. One of the files you get is called rgbfix.exe. Just put it in the same directory as lsdj, navigate there in a command prompt, and type

rgbfix -v lsdj.gb

It'll validate the checksums and your ROM will boot no problem.

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