/**
* @brief initialize the display context to useful values
*
* Zap the display context.
* Allocate a framebuf array to save updating the bitmap when
* there is no change in the data word.
*/
void alto2_cpu_device::init_disp()
{
memset(&m_dsp, 0, sizeof(m_dsp));
save_item(NAME(m_dsp.state));
save_item(NAME(m_dsp.hlc));
save_item(NAME(m_dsp.setmode));
save_item(NAME(m_dsp.inverse));
save_item(NAME(m_dsp.halfclock));
save_item(NAME(m_dsp.fifo));
save_item(NAME(m_dsp.wa));
save_item(NAME(m_dsp.ra));
save_item(NAME(m_dsp.a63));
save_item(NAME(m_dsp.a66));
save_item(NAME(m_dsp.dht_blocks));
save_item(NAME(m_dsp.dwt_blocks));
save_item(NAME(m_dsp.curt_blocks));
save_item(NAME(m_dsp.curt_wakeup));
save_item(NAME(m_dsp.xpreg));
save_item(NAME(m_dsp.csr));
m_disp_a38 = prom_load(machine(), &pl_displ_a38, memregion("displ_a38")->base());
m_disp_a63 = prom_load(machine(), &pl_displ_a63, memregion("displ_a63")->base());
m_disp_a66 = prom_load(machine(), &pl_displ_a66, memregion("displ_a66")->base());
m_dsp.hlc = A2_DISP_HLC_START;
m_dsp.framebuf = std::make_unique<uint16_t[]>(A2_DISP_TOTAL_HEIGHT * A2_DISP_SCANLINE_WORDS);
m_dsp.patterns = auto_alloc_array(machine(), uint8_t, 65536 * 16);
for (int y = 0; y < 65536; y++) {
uint8_t* dst = m_dsp.patterns + y * 16;
for (int x = 0; x < 16; x++)
*dst++ = (~y >> (15 - x)) & 1;
}
// Allocate a bitmap including the V/H blank areas
m_dsp.bitmap = std::make_unique<bitmap_ind16>(A2_DISP_TOTAL_WIDTH, A2_DISP_TOTAL_HEIGHT);
m_dsp.state = 0;
}
/**
* @brief initialize the mouse context to useful values
*
* From the Alto Hardware Manual:
* <PRE>
* The mouse is a hand-held pointing device which contains two encoders
* which digitize its position as it is rolled over a table-top. It also
* has three buttons which may be read as the three low order bits of
* memory location UTILIN (0177030), iin the manner of the keyboard.
* The bit/button correspondence in UTILIN are (depressed keys
* correspond to 0's in memory):
*
* UTILIN[13] TOP or LEFT button (RED)
* UTILIN[14] BOTTOM or RIGHT button (BLUE)
* UTILIN[15] MIDDLE button (YELLOW)
*
* The mouse coordinates are maintained by the MRT microcode in locations
* MOUSELOC(0424)=X and MOUSELOC+1(0425)=Y in page one of the Alto memory.
* These coordinates are relative, i.e., the hardware only increments and
* decrements them. The resolution of the mouse is approximately 100 points
* per inch.
* </PRE>
*/
void alto2_cpu_device::init_mouse()
{
memset(&m_mouse, 0, sizeof(m_mouse));
m_madr_a32 = prom_load(machine(), &pl_madr_a32, memregion("madr_a32")->base());
}
/**
* @brief clear all keys and install the mmio handler for KBDAD to KBDAD+3
*/
void alto2_cpu_device::init_hw()
{
memset(&m_hw, 0, sizeof(m_hw));
m_madr_a64 = prom_load(machine(), &pl_madr_a64, memregion("madr_a64")->base());
m_madr_a65 = prom_load(machine(), &pl_madr_a65, memregion("madr_a65")->base());
}