6502
/
EightBitNet
mirror of https://github.com/MoleskiCoder/EightBitNet.git
1
0
Fork 0
Code Issues Projects Releases Wiki Activity

Merge branch 'master' of https://github.com/MoleskiCoder/EightBitNet

This commit is contained in:
Adrian Conlon 2019-08-16 18:05:16 +01:00
parent c06f556669 cd80935470
commit 7942ca7085
1 changed files with 11 additions and 10 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

21
LR35902/IoRegisters.cs
View File

@ -342,16 +342,17 @@ namespace EightBit.GameBoy
// Port/Mode Registers
case P1:
{
var p14 = this.scanP14 && !this.p14;
var p15 = this.scanP15 && !this.p15;
var live = p14 || p15;
var p10 = live && this.p10 ? 1 : 0;
var p11 = live && this.p11 ? 1 : 0;
var p12 = live && this.p12 ? 1 : 0;
var p13 = live && this.p13 ? 1 : 0;
this.Poke(
port,
(byte)(p10 | (p11 << 1) | (p12 << 2) | (p13 << 3) | (int)(Bits.Bit4 | Bits.Bit5 | Bits.Bit6 | Bits.Bit7)));
var directionKeys = this.scanP14 && !this.p14;
var miscKeys = this.scanP15 && !this.p15;
var live = directionKeys || miscKeys;
var rightOrA = (live && !this.p10) ? 0 : Bits.Bit0;
var leftOrB = (live && !this.p11) ? 0 : Bits.Bit1;
var upOrSelect = (live && !this.p12) ? 0 : Bits.Bit2;
var downOrStart = (live && !this.p13) ? 0 : Bits.Bit3;
var lowNibble = (byte)(rightOrA | leftOrB | upOrSelect | downOrStart);
var highNibble = (byte)Chip.PromoteNibble((byte)Mask.Mask4);
var value = (byte)(lowNibble | highNibble);
this.Poke(port, value);
}
break;