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Old 14 December 2010, 14:50   #1
NovaCoder
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Join Date: Sep 2007
Location: Melbourne/Australia
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Latest version of ScummVM ported to AGA

Overview:

ScummVM AGA is an interpreter that allows you to run certain classic graphical point-and-click adventure games on an Amiga (provided you have their data files).
The clever part about this: ScummVM just replaces the executables shipped with the games, allowing you to play them on systems for which they were never designed!

ScummVM AGA only supports certain ScummVM game engines (due to performance issues)...see the About Box within the ScummVM Launcher.

Requirements:

1) An AGA Amiga (PAL only) with a FAST 68030 processor
2) At least 32 MB of FASTRAM
3) AHI installed (v4.18 recommended)
4) 3.1 ROMS (3.0 ROMS may cause it to run slowly)
5) Some supported games or demos

Features:

* Double buffered 16 bit stereo digital SFX and speech
* MIDI music emulation (no hardware required)
* Double buffered 256 color AGA graphics
* External MIDI support (using the CAMD library)
* 16 bit GUI (converted to 8 bit in real-time!)
* Screen shake (and it actually works this time)
* Back ported OS4, MorphOS and AROS code!


Configuration Options:

The AHI device used will be the one setup in your AHI Prefs (unit 0).
Only the original uncompressed audio files are supported, you cannot use audio
files that have been compressed.
You will need to install the CAMD library if you want to use an external MIDI
device.
There are also various configuration options within the ScummVM Launcher (see
the official ScummVM readme for more details).

There are a few Tooltypes to play with.

1) AUDIO_THREAD_PRIORITY: This should be set to a higher priority than the main
thread to avoid audio issues.
2) CLOSE_WB: Enable to close the Workbench (3.1 ROMS recommended)


Performance Considerations:

1) You should always patch exec.library's CopyMem() and CopyMemQuick() routines
for faster processor specific versions.
2) Try reducing the audio playback frequency down to 8k if you're still having
performance issues.
3) If you are using Paula, stick with the 'FAST' 8/14 bit modes for AHI (prefs)
- a real 16 bit card may be faster with a 16 bit mode.
4) This interpreter really hits the hard drive so you'll need a fast transfer
rate for the newer games (see below)
5) FFS is really really slow, use PFS3 instead
6) Loading your ROM into FASTRAM is a great idea (see below)
7) If you have a Blizzard you should really be using BlizKick to get most speed
out of your Amiga, Apollo users should be using RemApollo.
8) Stick with v4.18 of AHI as the later versions are too slow



Links:

http://eab.abime.net/showthread.php?t=56815 (ScummVM AGA thread on EAB)
http://www.scummvm.org/
http://www.scummvm.org/demos/
http://eab.abime.net/index.php



Thanks and acknowledgments:

Mikael Kalms for his help, advice and excellent C2P routines.
The ScummVM developers, my mother, the UtilityBase crew for help and advice.
Minuous for the awesome installers and the EAB beta testers especially DDNI and Rockersuke who went above and beyond the call of duty.

Quote:
Originally Posted by NovaCoder View Post
This port uses AHI, it's really important that people use v4.18 of AHI with one of the 'FAST' modes set to be used in the AHI Prefs otherwise it will run slow on a real Amiga (this is true for any of my ports that use AHI).

BTW Boing Bags 3/4 will upgrade your Amiga to v6.x of AHI so check what version you are actually running.
Video setup guide -> [ Show youtube player ]

Last edited by NovaCoder; 03 March 2017 at 07:45.
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