private void RewriteSys()
{
if (!EatSpaces() ||
!GetInteger(out int addr))
{
throw new InvalidOperationException("Expected address after SYS.");
}
var addrMachineCode = Address.Ptr16((ushort)addr);
IProcessorArchitecture arch6502 = host.GetArchitecture("m6502");
rtlc = InstrClass.Transfer | InstrClass.Call;
m.CallX(addrMachineCode, 2, arch6502);
}