Yusuke Miyauchi brings us an original game where we control a spaceship which has no attacking capabilities. As we travel along space, there will be annoying lasers chasing us all over the screen, while enemy bullets approach our ship as well while we can not fire any projectiles ourselves.

But, how can this be? Well, the only hope to survive is using our ship power to generate a gravity field around itself in order to pass through the lasers but at the same time we are like a magnet for enemy bullets. We'll have to find the balance between avoiding lasers and allowing the bullets to approach us... This will not be easy. We have to master this gravity field in order to reach the highest record.

Are you working on an MSX game, or even have one finished? Please consider to submit your work as an entry for this legendary MSX contest, and have the guarantee of a wide as possible audience, gain the attention of potential cartridge producers and even contend to win some prizes!

Relevant link: MSXdev - GRAVITICA

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  • MSXdev'18 #10 - GRAVITICA
  • MSXdev'18 #10 - GRAVITICA
  • MSXdev'18 #10 - GRAVITICA
  • MSXdev'18 #10 - GRAVITICA

Comments (15)

By gdx

Prophet (3499)

gdx's picture

30-12-2018, 08:48

Original and nice game!

By ray2day

Champion (492)

ray2day's picture

30-12-2018, 17:21

Indeed an original game! Compliments

By ghost_jp

Master (134)

ghost_jp's picture

31-12-2018, 00:06

Let me talk about the author, Yusuke Miyauchi.

He is very famous novelist in Japan. This year his latest work titled あとは野となれ大和撫子, won the 星雲賞 which is one of the most authorized SF prize in Japan. He is also known for that he talked about Z80 and MSX on his short story titled エターナル・レガシー included in his collection of short stories titled 超動く家にて, among some Japanese MSXers.

GRAVITICA is very unique game. I'm so pleased at inviting a new rival to MSXdev.

By santiontanon

Paladin (939)

santiontanon's picture

31-12-2018, 00:20

oh wow! Didn't know he was a famous writer! Very nice to see he is also a good MSX developer! Although simple, I found this game enjoyable and also interesting technically with the very smooth scroll! So, indeed a welcome new rival Big smile

By Manuel

Ascended (16638)

Manuel's picture

02-01-2019, 16:12

Indeed, thanks for clearing that up ghost_jp! Very interesting that he has time and interest to join! Yes, MSX is our Eternal Legacy Smile

By ray2day

Champion (492)

ray2day's picture

13-03-2019, 22:28

I have some font issues with the game on my real MSX. Both using Megaflash ROM or LOADROM.ROM messes up the text of the game (both different, but both messed up. not as what the font has to be. like for example on my emulator (Mac with Open MSX) the game works fine and the font/text looks good). Someone/anyone any ideas?

By Manuel

Ascended (16638)

Manuel's picture

13-03-2019, 23:12

Which real MSX did you try? Did you try on another real MSX as well?

By ray2day

Champion (492)

ray2day's picture

15-03-2019, 19:46

@Manuel Multiple real MSX machines using Megaflash ROM (tried LOADROM also).

By ray2day

Champion (492)

ray2day's picture

01-01-2020, 19:05

Unfortunately this issue is not solved yet... The game is playable, but the text is looking awful.
Does anybody have a clue / idea what causes this problem? Or even better; The solution to solve this problem?

On real MSX;

How it supposed to be (emulator);

By gdx

Prophet (3499)

gdx's picture

02-01-2020, 09:48

I tryed Gravitica on MSX1 at 60Hz. It works fine.
I watched the program a bit. Maybe it doesn't work on MSX1s at 50Hz because of the interruptions.
So I modified two access to the VDP. Try it to see if it works better like that.

Download link : https://mon-partage.fr/f/HWUvlAlK/

By ray2day

Champion (492)

ray2day's picture

02-01-2020, 17:57

@gdx Thank you for trying to help to solve the problem!

I tried;

- original rom on my NMS8245 MSX2 with MFR using the 60 hertz option -> still messed up text
- the adapted rom on my NMS8245 MSX2 with MFR using the 60 hertz option -> does not work / black screen
- the adapted rom on my NMS8245 MSX2 with MFR -> does not work / black screen
(btw adapted rom works normaly on open msx (emulator))

By gdx

Prophet (3499)

gdx's picture

03-01-2020, 08:29

Fixed! (I think)

Download: https://mon-partage.fr/f/afNPXHOy/

I just replaced:

7689:	ei
768A:	out	(#99),a
768C:	in	a,(#98)

by:

7689:	out	(#99),a
768B:	ei
768C:	in	a,(#98)

and disabled the interruptions during two VDP accesses (even if I not sure that is really necessary).

By ray2day

Champion (492)

ray2day's picture

03-01-2020, 10:02

@gdx Again thank you, but the provided rom file does not work.

I tried;

- the adapted rom on my NMS8245 MSX2 with MFR using the 60 hertz option -> does not work / black screen
- the adapted rom on my NMS8245 MSX2 with MFR -> does not work / black screen
- the adapted rom on Open MSX (emulator mac) -> does not work / black screen

By gdx

Prophet (3499)

gdx's picture

03-01-2020, 11:20

Try with another loader. For example SofaRom, with the option /D0. I had the same issue on turbo R in 50Hz in Z80 mode but the game works well now. Black screen only remains for a few seconds at start.

By hamlet

Scribe (3097)

hamlet's picture

04-01-2020, 11:09