Cosmos/source/Kernel-X86/10-CPU/Cosmos.CPU.x86/IOGroup/PIC.cs

namespace Cosmos.CPU.x86.IOGroup {
    public class PIC : IOGroup {
        public readonly IOPort Cmd = new IOPort(0x20);
        public readonly IOPort Data = new IOPort(0x21);

        internal PIC(bool aSlave) {
            byte aBase = (byte)(aSlave ? 0xA0 : 0x20);
            Cmd = new IOPort(aBase);
            Data = new IOPort((byte)(aBase + 1));
        }
    }
}