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Jonathan Gevaryahu 395599a6fe TMS5220 changes, bugfixes and updates (#3654)
* 5220 changes part 1: comments

* 5220 changes part 2: renaming improperly capitalized pseudo-macros, and remove pseudo-macros from lvalues

* 5220 part 3: reorganize savestate values into a sane, maintainable order

* 5220 changes part 4: remove the unused, deprecated time_to_ready and cycles_to_ready functions

* 5220 changes part 5: fix the race condition bug with m_buffer_low and m_buffer_empty flags not being updated before setting the interrupt state

* 5220 changes part 6: fix the issue where if no VSM is actually attached to the 5220, the chip will get stuck speaking silence forever if it gets a Speak VSM command. In reality (at least on the tms51xx and probably the same here) the pin reads as open bus/noise, but will eventually hit a stop frame by reading 4 ones in a row.

* (missed lines from parts 1 and 2)

* 5220 changes part 7: add/fix debugger fences for read functions where they were missing, and a write function where it was unnecessary and caused issues when issuing manual writes from the debugger

* 5220 changes part 8: change the types of the flag variables already used for boolean values to bool, and simplified comparisons with them; also renamed the ambiguous m_data_register variable to the more descriptive name of m_read_byte_register

* (more missed lines from parts 1 and 2)

* 5220 changes part 9: change status_read such that reading the status register from the debugger returns a valid value instead of 0, but doesn't otherwise affect the emulation

* 5220 changes 10: make it so the /READY(readyq) callback only changes state to ready after a write during speak external mode, if the write actually completed because there was room in the FIFO. If not, it polls the fifo state every 16 cycles until there is room, and only then asserts the readyq callback.

* 5220 changes part 11: actually zero the fifo during initialization and when speak external goes active. replace memset calls with std::fill

* commit two forgotten lines
2018-06-17 02:31:52 +10:00
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README.md
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MAME

Join the chat at https://gitter.im/mamedev/mame

Build status for tiny build only, containing just core parts of project:

OS/Compiler Status
Linux GCC / OSX Clang Build Status
Windows MinGW Build Status

Static analysis status for entire build (except for third-party parts of project):

Coverity Scan Status

What is MAME?

MAME is a multi-purpose emulation framework.

MAME's purpose is to preserve decades of software history. As electronic technology continues to rush forward, MAME prevents this important "vintage" software from being lost and forgotten. This is achieved by documenting the hardware and how it functions. The source code to MAME serves as this documentation. The fact that the software is usable serves primarily to validate the accuracy of the documentation (how else can you prove that you have recreated the hardware faithfully?). Over time, MAME (originally stood for Multiple Arcade Machine Emulator) absorbed the sister-project MESS (Multi Emulator Super System), so MAME now documents a wide variety of (mostly vintage) computers, video game consoles and calculators, in addition to the arcade video games that were its initial focus.

How to compile?

If you're on a *NIX or OSX system, it could be as easy as typing

make

for a MAME build,

make SUBTARGET=arcade

for an arcade-only build, or

make SUBTARGET=mess

for MESS build.

See the Compiling MAME page on our documentation site for more information, including prerequisites for Mac OS X and popular Linux distributions.

For recent versions of OSX you need to install Xcode including command-line tools and SDL 2.0.

For Windows users, we provide a ready-made build environment based on MinGW-w64.

Visual Studio builds are also possible, but you still need build environment based on MinGW-w64. In order to generate solution and project files just run:

make vs2015

or use this command to build it directly using msbuild

make vs2015 MSBUILD=1

Where can I find out more?

Contributing

Coding standard

MAME source code should be viewed and edited with your editor set to use four spaces per tab. Tabs are used for initial indentation of lines, with one tab used per indentation level. Spaces are used for other alignment within a line.

Some parts of the code follow Allman style; some parts of the code follow K&R style -- mostly depending on who wrote the original version. Above all else, be consistent with what you modify, and keep whitespace changes to a minimum when modifying existing source. For new code, the majority tends to prefer Allman style, so if you don't care much, use that.

All contributors need to either add a standard header for license info (on new files) or inform us of their wishes regarding which of the following licenses they would like their code to be made available under: the BSD-3-Clause license, the LGPL-2.1, or the GPL-2.0.

License

The MAME project as a whole is distributed under the terms of the GNU General Public License, version 2 or later (GPL-2.0+), since it contains code made available under multiple GPL-compatible licenses. A great majority of files (over 90% including core files) are under the BSD-3-Clause License and we would encourage new contributors to distribute files under this license.

Please note that MAME is a registered trademark of Gregory Ember, and permission is required to use the "MAME" name, logo, or wordmark.

Copyright (C) 1997-2018  MAMEDev and contributors

This program 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 2 of the License, or
(at your option) any later version.

This program 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 this program; if not, write to the Free Software Foundation, Inc.,
51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.

Please see LICENSE.md for further details.