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FM Towns Emulator "Tsugaru" Project

ysflight.com

I am writing an FM Towns emulator since January 2020.  I suppose it would be easier if I import existing CPU core, audio-chip core, etc., but if I do so it won't be my experience.  I am going hard way and writing from real scratch, beginning with 486 core.

There are two known FM Towns emulators.  Kasanova's UNZ probably is the best emulates FM Towns, and I hear that MAME is getting better.  But, in my opinion, it is good to have three or four programs that do the same thing.  If we have only one, and if it is terminated, or suddenly unavailable, we will be left in the dark.  Such a risk is higher than ever because OS developers irresponsibly and unnecessarily and too frequently drops backward compatibility.  I am lucky enough to be a programmer, I am trying to write what I need by my own whenever possible.

Also I have my own motivation.  My goal is to keep actual FM Towns PCs alive as long as possible, and for that purpose I developed YSSCSICD.SYS.  But, some game titles are directly accessing CD-ROM I/O, in such cases I need to write a patch.  Other emulators have absolutely no reason to emulate SCSI-connected CD-ROM drive, but I do have a reason.  So, one of my goals is to emulate SCSI-connected CD-ROM drive, so that I can write patches easier.

The source code has been on Github.

https://github.com/captainys/TOWNSEMU

I made executable binaries available from the following:

https://github.com/captainys/TOWNSEMU/releases

Click on "Assets" where you will see download links.

I have added a GUI module as well.  Tsugaru_GUI will do.  It internally calls Tsugaru_CUI, so the both executables must be in the same directory.

Windy kindly created a Wiki.

https://wiki3.jp/fmtowns

I started mid January 2020, and after 4 months it can play Afterburner II!

Tested Software Titles

Software Title Developer Date Tested What's Tested
Towns OS V1.1 L10 Fujitsu (Unit Test) Boot, Basic operations, Demo programs
Towns OS V1.1 L30 Fujitsu (Unit Test) Boot, Basic operations
Towns OS V2.1 L10 Fujitsu 2020/05/23 Boot, Basic operations, Requires -PRETEND386DX option. (Tested with Free Software Collection 4 Disc B)
Towns OS V2.1 L10B Fujitsu 2020/05/23 Boot, Basic operations
Towns OS V2.1 L20 Fujitsu (Unit Test) Boot, Basic operations
Towns OS V2.1 L31 Fujitsu 2020/05/23 Boot, Basic operations
Towns OS V2.1 L50 Fujitsu 2020/05/23 Boot, Basic operations (Tested with Free Software Collection 11)
F-BASIC 386 V2.1 L10 Fujitsu 2020/05/23 Boot, Running simple programs
MS-DOS V3.1 Fujitsu (Unit Test) Boot, Basic operations
Afterburner II SEGA/CRI 2020/05/23 Play tested to Stage 8 (Regularly tested up to Auto Demo)
Turbo Out Run SEGA/CRI 2020/05/23 Play tested to the second check point. (Regularly tested up to Auto Demo)
Galaxy Force II SEGA/CRI 2020/05/23 Play tested to Stage 3. (Regularly tested up to the title screen)
Wing Commander I Origin 2020/05/25 Opening Demo, Save Game, Started a mission, Shot down one enemy.
Augusta Far Far Away T&E Soft 2020/06/07 Opening Demo, Shot Practices, Stroke Play Hole 1
Alone in the Dark INFOGRAMES 2020/06/07 Opening Demo, Started the Game
RAYXANBER DATAWEST 2020/06/12 Start Playing  (Regularly tested up to Auto Demo)
Afterburner III SEGA/CRI 2020/06/12 Start Playing, a few stages
Air Combat II Special System Soft 2020/06/13 Started the mission, but cannot control because I cannot figure key assignments.  (Regularly tested up to opening demo)
Super DAISENRYAKU System Soft 2020/06/13 Started a game, played from an old save data, finished Island Campaign, Ending roll.  BGM lags though.
VIEWPOINT SNK/VING 2020/06/17 Auto Demo, Started the Game (Regularly tested auto demo)
Chase HQ TAITO/VING 2020/06/19 Start playing, finished stages 1 and 2.  (Regularly tested auto demo)
Take the A-Train 3 ARTDINK 2020/06/20 Making a user-disk, Game start, Placed rail track.  (Regularly tested up to opening)
F-29 Retaliator Imagineer 2020/06/23 Auto-Demo, Flying in Zulu-Alert mode.
Libble Rabble namco/DEMPA 2020/06/30 Payable, but slow.
VSGP Drivers T's
(In Free Software
Collection 6)
2020/06/30 Drove FD1 map all the way.  But, this program doesn't seem to be controlling timing with a timer.
You probably want to reduce speed to 12MHz or so.
Sky Duel Makken
(In Free Software
Collection 9)
2020/06/30 Flew through Snowy Valley.
Puyo Puyo COMPILE/CRI 2020/07/01 Played stage 1
Dungeon Master FTL 2020/07/02 Took somewhat long time to load.  But, I was able to resurrect a character, walked around, and throw a shuriken.
Emerald Dragon GLODIA 2020/07/03 Game title, Start Playing, and Start Battle.
Advantage Tennis INFOGRAMES 2020/07/03 Playable, but runs too fast.  May need to reduce frequency.

Confirmed NOT Work at this moment

Fractal Engine Demo Psygnosis 2020/07/02 Intentionally causing page fault, which is not emulated by my CPU core at this moment.  Performance degradation for emulating page fault might be substantial.  Postponed to support at this moment.

 
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