UINT8 tms34061_device::read(address_space &space, int col, int row, int func)
{
int result = 0;
offs_t offs;
/* the function code determines what to do */
switch (func)
{
/* both 0 and 2 map to register access */
case 0:
case 2:
result = register_r(space, col);
break;
/* function 1 maps to XY access; col is the address adjustment */
case 1:
result = xypixel_r(space, col);
break;
/* funtion 3 maps to direct access */
case 3:
offs = ((row << m_rowshift) | col) & m_vrammask;
result = m_vram[offs];
break;
/* function 4 performs a shift reg transfer to VRAM */
case 4:
offs = col << m_rowshift;
if (m_regs[TMS34061_CONTROL2] & 0x0040)
offs |= (m_regs[TMS34061_CONTROL2] & 3) << 16;
offs &= m_vrammask;
memcpy(&m_vram[offs], m_shiftreg, (size_t)1 << m_rowshift);
memset(&m_latchram[offs], m_latchdata, (size_t)1 << m_rowshift);
break;
/* function 5 performs a shift reg transfer from VRAM */
case 5:
offs = col << m_rowshift;
if (m_regs[TMS34061_CONTROL2] & 0x0040)
offs |= (m_regs[TMS34061_CONTROL2] & 3) << 16;
offs &= m_vrammask;
m_shiftreg = &m_vram[offs];
break;
/* log anything else */
default:
logerror("%s:Unsupported TMS34061 function %d\n", space.machine().describe_context(),
func);
break;
}
return result;
}
UINT8 tms34061_r(int col, int row, int func)
{
int result = 0;
offs_t offs;
/* the function code determines what to do */
switch (func)
{
/* both 0 and 2 map to register access */
case 0:
case 2:
result = register_r(col);
break;
/* function 1 maps to XY access; col is the address adjustment */
case 1:
result = xypixel_r(col);
break;
/* funtion 3 maps to direct access */
case 3:
offs = ((row << tms34061.intf.rowshift) | col) & tms34061.vrammask;
result = tms34061.vram[offs];
break;
/* function 4 performs a shift reg transfer to VRAM */
case 4:
offs = col << tms34061.intf.rowshift;
if (tms34061.regs[TMS34061_CONTROL2] & 0x0040)
offs |= (tms34061.regs[TMS34061_CONTROL2] & 3) << 16;
offs &= tms34061.vrammask;
memcpy(&tms34061.vram[offs], tms34061.shiftreg, (size_t)1 << tms34061.intf.rowshift);
memset(&tms34061.latchram[offs], tms34061.latchdata, (size_t)1 << tms34061.intf.rowshift);
break;
/* function 5 performs a shift reg transfer from VRAM */
case 5:
offs = col << tms34061.intf.rowshift;
if (tms34061.regs[TMS34061_CONTROL2] & 0x0040)
offs |= (tms34061.regs[TMS34061_CONTROL2] & 3) << 16;
offs &= tms34061.vrammask;
tms34061.shiftreg = &tms34061.vram[offs];
break;
/* log anything else */
default:
logerror("Unsupported TMS34061 function %d - PC: %04X\n",
func, activecpu_get_pc());
break;
}
return result;
}
