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## ZX-TSid
Sound card for ZX Spectrum edge connector (ZX-BUS). Contains MOS SID, YM2149 (AY-3-8910) and covox.
MOS SID sound card for ZX Spectrum edge connector (ZX-BUS).
### Current status
Work in progress, both pcb and firmware isn't finished yet and may contain serious issues.
Please note the [errata](pcb/rev.A/ERRATA.txt) for rev.A pcb.
### SID
MOS-6581 or MOS-8580 may be installed, but with some cautions. This addon doesn't contain buffers between SID and bus connector, and that may cause SID's damage by ESD if no luck. As I have no real SID, I've checked this addon only with SwinSID.
PCB is compatible with SID 6581 and 8580, but also contains integrated SwinSID emulator.
SID accessible via #xxCF port, where xx - SID's register number.
### YM2149 (AY-3-8910)
Accessible by TurboSound standard as a second sound chip. ABC or ACB stereo panning selectable with onboard jumpers.
### Covox
Monophonic covox accessible via #xxFB port (Pentagon standard).
### Line input
You may connect your ZX Spectrum audio output to second 3.5mm jack and it will be mixed in sound card output signal.
### Compatibility
SID and Covox (theoretically) should work with any ZX Spectrum containing edge connector (48K, 128K, +3, clones, etc.).
YM2149 uses IORQGE signal, which is incompletely implemented in original ZX Spectrums and most clones (such as Harlequin). Sizif-512 and Karabas-128 clones implements IORQGE in right way.
### Changelog & current status
* Rev.A - initial release with SID, AY and Covox. [Errata](pcb/rev.A/ERRATA.txt).
* Rev.B - abandoned. Files kept for historical reason.
* Rev.C - removed AY and Covox. Added SwinSID emulator. PCB is vertical oriented now.
* Rev.D - improved signal-noise ratio. Added compatibility with turbo CPU modes (7MHz, 14Mhz).
TODO: check with real SID chip.