Going to play with the DAC on the Z80 PSoC. Dropped the WaveDAC8 symbol on the schematic.

PSoC Pinout

Hooked up to PSoC pin 95.

Added code:

void init_DAC(void)
{
    WaveDAC8_Start();
}

Looked at R4 and saw sine wave. 

Here's the DAC handler.

uint8 dacState;
uint8 outDataDAC;
uint8 inDataDAC;

///////////////////////////////////////////////////////////////////////////////
// void init_DAC(void) - Initialize the DAC

void init_DAC(void)
{
    WaveDAC8_Start();
    outDataDAC = 0;
    inDataDAC = 0;
}

///////////////////////////////////////////////////////////////////////////////
// void writeDAC(void) - Write to the DAC data

void writeDAC(void)
{
    outDataDAC = Z80_Data_Out_Read();
}

///////////////////////////////////////////////////////////////////////////////
// void readDAC(void) - Read the DAC data

void readDAC(void)
{
    Z80_Data_In_Write(outDataDAC);
    ackIO();
}

///////////////////////////////////////////////////////////////////////////////
// void readStatDAC(void) - Read the DAC Status

void readStatDAC(void)
{
    Z80_Data_In_Write(dacState);
    ackIO();
}

///////////////////////////////////////////////////////////////////////////////
// void writeCmdDAC(void) - Write the DAC command
//  0 = Turn off DAC output
//  1 = Turn on DAC output

void writeCmdDAC(void)
{
    dacState = Z80_Data_Out_Read();
    if (dacState == 0)
    {
        WaveDAC8_Stop();
    }
    else if (dacState == 1)
    {
        WaveDAC8_Start();
    }
    ackIO();
}

Here's the output, 

1 KHz. Matches the setup in PSOC Creator.