public void WriteVideoRamAndReadVideoRam()
{
TestContext.WriteLine("outputDmdDisplay, writeVideoRam and readVideoRam");
byte BANK = 2;
byte OFFSET = 1;
outputDmdDisplay.writeVideoRam(BANK, OFFSET, 33);
var result = outputDmdDisplay.readVideoRam(BANK, OFFSET);
Assert.That(result, Is.EqualTo(33));
}
public void write(ushort offset, byte value)
{
var address = dmdMapper.getAddress(offset);
if (address.subsystem == dmdMapper.SUBSYSTEM_DMD_VIDEORAM)
{
outputDmdDisplay.writeVideoRam((byte)address.bank, address.offset, value);
return;
}
this.ram[offset] = value;
switch (offset)
{
case OP.WPC95_PRINTER_DATA:
case OP.WPC95_PRINTER_BAUD:
case OP.WPC95_PRINTER_ADDR:
case OP.WPC95_PRINTER_STATUS:
case OP.WPC95_PRINTER_PRESENCE:
Debug.Print("WRITE_IGNORED {0} {1}", REVERSEOP[offset], value);
break;
case OP.WPC_DMD_SCANLINE:
Debug.Print("WRITE {0} {1}", REVERSEOP[offset], value);
// The CPU can also write to WPC_DMD_SCANLINE to request an FIRQ interrupt to be generated when the current scanline reaches a certain value.
// This is used to implement shading: the active page buffer is rapidly changed between different bit planes at different frequencies to simulate color.
// Because there is latency between the time that FIRQ is generated and the CPU can respond to it, this writable register can compensate for that delay
// and help to ensure that flipping occurs as fast as possible.
outputDmdDisplay.requestFIRQ = true;
break;
case OP.WPC_DMD_ACTIVE_PAGE:
Debug.Print("WRITE {0} {1}", REVERSEOP[offset], value);
// The visible page register, WPC_DMD_ACTIVE_PAGE, holds the page number of the frame that should
// be clocked to the display. Writing to this register does not take effect immediately but instead
// at the beginning of the next vertical retrace.
outputDmdDisplay.setNextActivePage(value);
break;
//which page is exposed at address 0x3800?
case OP.WPC_DMD_LOW_PAGE:
// AKA PAGE3800
outputDmdDisplay.selectDmdPage(0, value);
break;
case OP.WPC_DMD_HIGH_PAGE:
// AKA PAGE3A00
outputDmdDisplay.selectDmdPage(1, value);
break;
case OP.WPC95_DMD_PAGE3000:
outputDmdDisplay.selectDmdPage(2, value);
break;
case OP.WPC95_DMD_PAGE3200:
outputDmdDisplay.selectDmdPage(3, value);
break;
case OP.WPC95_DMD_PAGE3400:
outputDmdDisplay.selectDmdPage(4, value);
break;
case OP.WPC95_DMD_PAGE3600:
outputDmdDisplay.selectDmdPage(5, value);
break;
case OP.WPC_ALPHA_POS:
this.outputAlphaDisplay.setSegmentColumn(value);
break;
case OP.WPC_ALPHA_ROW1_A:
this.outputAlphaDisplay.setRow1(true, value);
break;
case OP.WPC_ALPHA_ROW1_B:
this.outputAlphaDisplay.setRow1(false, value);
break;
case OP.WPC_ALPHA_ROW2_A:
this.outputAlphaDisplay.setRow2(true, value);
break;
case OP.WPC_ALPHA_ROW2_B:
this.outputAlphaDisplay.setRow2(false, value);
break;
default:
Debug.Print("W_NOT_IMPLEMENTED {0} {1}", "0x" + offset.ToString("X4"), value);
Debug.Print("DMD W_NOT_IMPLEMENTED {0} {1}", "0x" + offset.ToString("X4"), value);
break;
}
}
