* Added akkaarrh to the ci target.
* Switched Travis CI to Ubuntu Focal.
* Allow ppc64le CI build to fail.
* Report CI status as soon as a job has failed or remaining jobs are allowed to fail.
Sound and other improvements to Sega G-80 games: [Aaron Giles, couriersud]
* Added netlist-based sound to Eliminator, Zektor, Space Fury, and Astro Blaster.
* Split the Sega Universal Sound Board and Speech Boards into their own separate files.
* Improved Universal Sound Board implementation for better accuracy in Star Trek and Tac/Scan.
* Wrote netlist-based backend for Universal Sound Board; currently disabled due to limitations in the system.
* Wrote netlist-based backend for Speech Board; currently disabled pending future sound system changes.
* Implemented wait states and the vector DRAW flag to help improve timing.
SP0250 Improvements: [Aaron Giles]
* Matched clock divider to real chip measurements.
* Fixed behavior when not fed enough data; addresses "gapping" in speech in Sega games.
* Implemented accurate LFR noise generator according to real chip measurements.
* Added pulse-width modulation DAC output mode for future consumption by netlist.
Netlist additions: [Aaron Giles]
* Added compile-time option to record nltool-compatible CSV files.
* Improved CD4020 implementation.
* Fixed CD4053 behavior.
* Added 74139 device.
* Added TL082 device.
8253 PIT changes: [Aaron Giles]
* Added explicit synchronization to all writes.
* Cleaned up some timing calculations to avoid double<->attotime conversions.
* sspeedr: new netlist audio implementation
Netlist-based audio implementation for sspeedr (Super Speed Race, 1979)
derived from Midway audio schematics, and based on that used for
280zzzap (280-ZZZAP) and lagunar (Laguna Racer) in the mw8080bw driver.
The Super Speed Race audio circuits are clearly derived from those games;
the biggest difference is the use of a linear feedback shift register
for noise generation.
* Updated netlist static solvers with recent netlist changes.
IMGUI_DISABLE_OBSOLETE_FUNCTIONS was defined in osd/modules.lua but not
in 3rdparty.lua. As a result, two different variants of struct ImGuiIO
were being defined, causing a C++ One Definition Rule violation
* new NOT WORKING machines
-----
PCP 8728 - 788 in 1 [David Shah]
unknown unSP based handheld [unknown]
* new NOT WORKING machines
------
Virtual Ping Pong (Protocol) [Sean Riddle, David Haywood]
My Arcade Gamer Mini 160-in-1 (DGUN-2953) [Sean Riddle, David Haywood]
* The saver/loadr commands should consider region endianness for portability.
-cpu/gigatron: Capitalisation of hex values was inconsistent, change it to lowercase as that tends to be the MAME standard.
-machine/exorterm.cpp: Fixed inputs magically changing on reset when they shouldn't (there are still others that should be fixed).
-mpu4vid.cpp: Corrected some errors in game descriptions.
-Fixed a couple of editing errors.
new NOT WORKING machines
------------------------
Super PC TV (Epoch) [Preservat!on Quest / Noah Bacon, Hubz]
U-Dance [Sean Riddle, David Haywood]
Moving Music (MM-TV110) [Sean Riddle, David Haywood]
* splitting up xavix a bit, preparation for better device encapsulation
* Move DIPs for 82S16, 82S115, and 2102A devices into nlm_proms
* Moved 7448 DIP to a macro. Replaced 7442 with truthtable and macro.
* Moved 74LS629 DIP into macro.
* Expand truthtable to handle 10 outputs.
