Subversion Repositories s80186

// Copyright Jamie Iles, 2017
//
// This file is part of s80x86.
//
// s80x86 is free software: you can redistribute it and/or modify
// it under the terms of the GNU General Public License as published by
// the Free Software Foundation, either version 3 of the License, or
// (at your option) any later version.
//
// s80x86 is distributed in the hope that it will be useful,
// but WITHOUT ANY WARRANTY; without even the implied warranty of
// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
// GNU General Public License for more details.
//
// You should have received a copy of the GNU General Public License
// along with s80x86.  If not, see <http://www.gnu.org/licenses/>.
 
// aas
void EmulatorPimpl::aas3f()
{
    uint16_t flags = registers->get_flags();
 
    auto al = registers->get(AL);
    auto ah = registers->get(AH);
    if ((al & 0x0f) > 9 || (flags & AF)) {
        al -= 6;
        al &= 0xf;
        --ah;
 
        flags |= AF | CF;
    } else {
        flags &= ~(AF | CF);
    }
 
    registers->set(AL, al);
    registers->set(AH, ah);
    registers->set_flags(flags, AF | CF);
}