DAC Emulation

Juku implementation extracted from https://github.com/ddanila/8080-cosim
at 8e74542e3f6a255c20c709156ae09ecb7fe750b8.
Original Juku project work: Danila Sukharev (ddanila), MIT.

The unchanged Intel 8080 core is by Nicolas Allemand, Copyright (c) 2018.
Its MIT license is reproduced in third_party/cpu/i8080/I8080_LICENSE.

The original Juku source identifies MAME's ussr/juku.cpp as its memory-model
reference (source checkout ref/mame_juku.cpp). Attribution retained:
Copyright holders: Dirk Best, Märt Põder. BSD-3-Clause.
The following notice applies to any material derived from that reference;
the repository's MIT license does not replace it.

Redistribution and use in source and binary forms, with or without
modification, are permitted provided that the following conditions are met:

1. Redistributions of source code must retain the above copyright notice,
   this list of conditions and the following disclaimer.
2. Redistributions in binary form must reproduce the above copyright notice,
   this list of conditions and the following disclaimer in the documentation
   and/or other materials provided with the distribution.
3. Neither the name of the copyright holder nor the names of its contributors
   may be used to endorse or promote products derived from this software
   without specific prior written permission.

THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE
LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
POSSIBILITY OF SUCH DAMAGE.


Shared Z80 CPU: floooh/chips, Copyright (c) 2021 Andre Weissflog,
zlib/libpng license. Original notice retained in third_party/cpu/chips/z80.h;
repository license retained in third_party/cpu/chips/LICENSE. The header is
unmodified; DAC's bus adapter is separate.

Robotron functional model: banking/video/I/O reference MAME rt1715.cpp,
Copyright holders Miodrag Milanovic, Robbbert, Sergey Svishchev,
BSD-3-Clause (the BSD conditions and disclaimer above also apply to any
material derived from this reference).

Robotron FDC/DMA/keyboard development references: robotron-1715m-fpga,
Copyright (c) 2026 Maxim Usov, MIT. Reference license reproduced in
machines/robotron1715m/REFERENCE_LICENSE. DAC's C adaptation implements a
subset, changes execution/timing, and is not the original FPGA design.
Historical ROMs/disks are not included or covered by these code licenses.

Robotron peripheral source references at the same pinned MAME revision:
  z80dma.cpp — Couriersud
  z80ctc.cpp — Wilbert Pol; based on work by Tatsuyuki Satoh
  upd765.cpp — Olivier Galibert
  i8275.cpp / i8275.h — Curt Coder, AJR
These references are BSD-3-Clause; the BSD conditions and disclaimer above
also apply to material derived from them. DAC implements a bounded subset.

Robotron K7658 keyboard wiring reference: Ulrich Zander, digitization dated
17 May 2009, drawing 56-330-4103-7 (pc_tasts.pdf). Cross-checked against the
pinned MAME rt1715.cpp with its BSD-3-Clause attribution above. No schematic
or historical keyboard ROM is redistributed in this core repository.

The unchanged chips Z80 disassembler (util/z80dasm.h) is also by Andre Weissflog,
under the zlib/libpng license retained in its header and chips-LICENSE.