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void SetLocationE()
{
    glLoadIdentity();
    glTranslatef(-11.5f, -8.125f, .0f);
}  

void drawQuad(float r, float g, float b) 
{
    // Draw quad
    SetLocationE();
    float x = j * 23.0 / 40.0;
    float y = i * 16.25 / 20.0;
    glTranslatef(x, y, zet);
    glBegin(GL_QUADS);
    //painting
    glColor3f(r, g, b);            
    //drawing  TOP RIGHT -> TOP LEFT
    //         -> BOTTOM LEFT -> BOTTOM RIGHT
    glVertex3f(0.15f, 0.15f, .0f);  //tr
    glVertex3f(-0.15f, 0.15f, .0f);  //tl    
    glVertex3f(-0.15f, -0.15f, .0f);  //bl    
    glVertex3f(0.15f, -0.15f, .0f);  //br
    glEnd();
}

void ScreenBuffer::RenderToScreen(GLvoid)
{
    glClear(GL_COLOR_BUFFER_BIT | GL_DEPTH_BUFFER_BIT);
    /* DRAW */
    for (int i = 0; i < 20; i++)
    {
        for (int j = 0; j < 40; j++)
        {
            // select color            
            if (MAP[i][j] == 'x') { 
                 drawQuad(0.0f, 0.0f, 0.0f); 
            }
            else if (MAP[i][j] == '0') 
            { 
                drawQuad(0.0f, 0.3f, 0.1f); 
            }
            else if (MAP[i][j] == 'o') 
            { 
                drawQuad(0.0f, 0.7f, 0.2f); 
            }
        }
    }
}

void SetLocationE()
{
    glLoadIdentity();
    glTranslatef(-11.5f, -8.125f, .0f);
}  

void ScreenBuffer::drawQuad(int column, int row, float r, float g, float b) 
{
    // Draw quad
    SetLocationE();
    float x = column * 23.0 / 40.0;
    float y = row * 16.25 / 20.0;
    glTranslatef(x, y, zet);
    glBegin(GL_QUADS);
    //painting
    glColor3f(r, g, b);            
    //drawing  TOP RIGHT -> TOP LEFT
    //         -> BOTTOM LEFT -> BOTTOM RIGHT
    glVertex3f(0.15f, 0.15f, .0f);  //tr
    glVertex3f(-0.15f, 0.15f, .0f);  //tl    
    glVertex3f(-0.15f, -0.15f, .0f);  //bl    
    glVertex3f(0.15f, -0.15f, .0f);  //br
    glEnd();
}

void ScreenBuffer::RenderToScreen(GLvoid)
{
    glClear(GL_COLOR_BUFFER_BIT | GL_DEPTH_BUFFER_BIT);
    /* DRAW */
    for (int i = 0; i < 20; i++)  // Y [0-20]
    {
        for (int j = 0; j < 40; j++)  // X [0-40]
        {
            // select color            
            if (MAP[i][j] == 'x') { 
                 drawQuad(j, i, 0.0f, 0.0f, 0.0f); 
            }
            else if (MAP[i][j] == '0') 
            { 
                drawQuad(j, i, 0.0f, 0.3f, 0.1f); 
            }
            else if (MAP[i][j] == 'o') 
            { 
                drawQuad(j, i, 0.0f, 0.7f, 0.2f); 
            }
        }
    }
}

I think you have a typo in these lines (BAIT and TAILS), it should be divided by 20 instead of 40 (HEAD divides y by 20). That explains why they are showed only on the bottom half of the screen.

I think you have a typo in these lines (BAIT and TAILS), it should be divided by 20 instead of 40 (HEAD divides y by 20). That explains why they are shown only on the bottom half of the screen.

Also you can extract the drawing of the quad to another function, because it is the same code.

void SetLocationE()
{
    glLoadIdentity();
    glTranslatef(-11.5f, -8.125f, .0f);
}  

void drawQuad(float r, float g, float b) 
{
    // Draw quad
    SetLocationE();
    float x = j * 23.0 / 40.0;
    float y = i * 16.25 / 20.0;
    glTranslatef(x, y, zet);
    glBegin(GL_QUADS);
    //painting
    glColor3f(r, g, b);            
    //drawing  TOP RIGHT -> TOP LEFT
    //         -> BOTTOM LEFT -> BOTTOM RIGHT
    glVertex3f(0.15f, 0.15f, .0f);  //tr
    glVertex3f(-0.15f, 0.15f, .0f);  //tl    
    glVertex3f(-0.15f, -0.15f, .0f);  //bl    
    glVertex3f(0.15f, -0.15f, .0f);  //br
    glEnd();
}

void ScreenBuffer::RenderToScreen(GLvoid)
{
    glClear(GL_COLOR_BUFFER_BIT | GL_DEPTH_BUFFER_BIT);
    /* DRAW */
    for (int i = 0; i < 20; i++)
    {
        for (int j = 0; j < 40; j++)
        {
            // select color            
            if (MAP[i][j] == 'x') { 
                 drawQuad(0.0f, 0.0f, 0.0f); 
            }
            else if (MAP[i][j] == '0') 
            { 
                drawQuad(0.0f, 0.3f, 0.1f); 
            }
            else if (MAP[i][j] == 'o') 
            { 
                drawQuad(0.0f, 0.7f, 0.2f); 
            }
        }
    }
}