openMSX Updated – v0.8.1

openMSX now sits at version 0.8.1. This is an MSX emulator for OSX that “aims for perfection”. Grab it from the Box File Widget on the right hand side of this blog as usual, or from their homepage.

mpage. Let’s check out the changes.

Release Notes for openMSX 0.8.1 (2011-03-12)

This release builds on the previous one, in the sense that we worked out the
features a little more. We added a lot of scripts to help you with Tool
Assisted Speedruns (TAS), one of the reasons openMSX got officially approved as
a TAS capable emulator on The reverse feature also got some
updates while doing this.
For the rest, this release does a lot of smaller fixes and additions, see the
list below.

Here's the list with all highlights:

New or improved emulator features:
- Quite complete support for TAS (see
  - TAS mode with many TAS widgets activated automatically
  - extended tools: keyboard view per frame, frame reverse/advance, robust
    frame counter, save slot mechanism, RAM watch, etc.
- Updates on reverse (and related features):
  - enabled by default now (except on Dingoo)
  - changed (default) extensions of replays and savestates to OMR and OMS
  - added a view only mode to the reverse feature (watch replays without
    interrupting them)
  - replays now usually contain multiple snapshots, so you can quickly jump
    around in a just loaded replay (e.g. to the end!)
  - huge performance improvements when loading replays/savestates
  - added filepools to put your software files in; when loading a replay with a
    file which is not available, openMSX will scan the filepools: default
    location is share/software
  - added hover with time indicator on reverse bar
  - fixed bug when using DirAsDisk in combination with reverse
  - added step_back function: while debugging step back one instruction
- Added info topic to query VDP timing information
- Fixed saving of replays, screenshots, etc., when the directory wasn't
  available yet
- Fixed bug in per-soundchip-channel audio recording
- Fixed auto stereo recording for mbstereo-like configurations (was done in
- OSD:
  - Show warning/error messages that were previously only shown on
    standard-output in an OSD text box
  - Added gradients for rectangles to make the OSD look more polished
  - Added border property to OSD rectangle
- Added script to find cases of too fast VDP access (of which the consequences
  are not emulated)
- Added setting to disable sprites and option to make screenshot without
  sprites (especially useful for map makers!)
- Added script to record movies in multiple files, especially useful for
  YouTube (record_chunks)
- Replaced automatic printing of ROM info (from the software database) with a
  command to get the info on demand (rom_info)
- Automatically plug in real joysticks into the MSX
- Several performance improvements to several toys scripts

MSX device support:
- Fixed accuracy of mouse emulation
- Fixed bug in sprite collision detection (sprites can't collide in the border)
- Better support for keyboard of Brazilian MSX machines
- Don't emulate Yes/No keys on machines that don't have them
- Accuracy improvements:
  - (minor) fixes in MSX-AUDIO, YM2413 (Okazaki) and R800 emulation
- Added emulation of the Mega Flash ROM SCC+ and ASCII Japanese MSX-DOS2
- Added emulation of seek delay, head-load and rotational delay on TC8566AF
  based disk drives
- Added Sony HB-F5 and CIEL Expert Turbo machine

Build system, packaging, documentation:
- Updates of libraries used in the static builds
- Windows binary built with Visual Studio 2010
- Basic (experimental) support for cross compilation of Windows 32 bit binaries
  from Linux (using MinGW)
- Updated C-BIOS to 0.25, with support for various localized machines

And of course the usual various bug fixes.

In "doc/manual/index.html" you can find a set of HTML manuals for openMSX.
Make sure you read this if you haven't used openMSX before, but also to learn
more about the new and changed features.

Known issues / caveats:
- Emulation is not perfect yet.
  See the bug tracker on for known bugs.
- Until we reach version 1.0.0, file formats can change in an incompatible way
  without backwards compatibility. This happened between 0.4.0 and 0.5.0, for
  example. Keep this in mind if you create machine descriptions, ROM database
  entries etc. We do try to be backwards compatible for at least one release,
  though. Keep in mind that openMSX is still evolving at a considerable speed.
- openMSX is confirmed to run on the following operating systems: Linux,
  Windows, Mac OS X, FreeBSD, OpenBSD and NetBSD; on x86, x86-64, PPC, ARM,
  MIPS and Sparc CPU's. Running on other operating systems (wherever SDL runs)
  or CPU's should be possible, but may require some modifications to the build
  system. If you are compiling on a new platform, please share your experiences
  (see below for contact info), so we can make openMSX more portable.
- CPU and graphics performance varies a lot, depending on the openMSX settings
  and the MSX hardware and software you're emulating. Some things run fine on a
  200 MHz machine, others are slow on a 2 GHz machine. For performance tuning
  tips, see the Setup Guide.

openMSX Home Page:
Project page on SourceForge:
Contact options:
- Send a message to the openmsx-user mailing list.
  Go to the SourceForge project page and look under "Lists".
- Post on our forum:
- Talk to us on #openmsx on

Thanks to all contributors for their feedback, support, bug reports, testing,
coding and other help!

Have fun with your emulated MSX!
(the openMSX developers)

About Mac Emulators
I am an Old School gamer with roots in emulation and gaming. I love video games, but mostly I love the old ones from our past. Emulation is a way to experience all these old games on your personal computer.

One Response to openMSX Updated – v0.8.1

  1. Pingback: IT Corner » Blog Archive » openMSX Updated – v0.8.1 « Mac Emulators Blog

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