Topic: Games for Home Systems (adds and more...)

[Gab75]

So, as eye2eye wrote, there's an "incongruity" (related to the Megadrive RGB-9 palette)... from what I understand, basically there are two possibilities:
- in some specific cases, the FBN emulation alter the RGB values and loses the matching with the 9-bit RGB palette;
- the sprites of ghosts/wraiths don't use the Shadow/Highlight mode, but other features (obtained with the aid of MCT377 chip*).

*I would rule out "custom" software algorithms, they are computationally very expensive and, especially, they can't add "new colors" to the Megadrive palette.

[eye2eye]

nope,

dink said, he did not emulate a single transistor of the mct, so in the emulation are no functions of the chip ergo
the colors could not be created via mct. it is likely this highlight mode in palette 3/color14/15 but the outcoming
colors are not part of the original genesis 512 color universe, heaven knows how the vdp creates those colors,
a little more or a little less power on some solder line to the picture generator...
maybe someone can look in an other game which uses this mode if the colors there match the genesis palette.

e2e

[Gab75]

... it is likely this highlight mode in palette 3/color14/15 but the outcoming colors are not part of the original genesis 512 color universe, heaven knows how the vdp creates those colors, a little more or a little less power on some solder line to the picture generator...

Could be... when/if analog-electronic components are involved a 100% accurate transposition in a digital environment is almost impossible... the C64 SID analog audio filters are very well-known in this regard...

[Stifu]

- what does this chip which seems to be not relevant for emulation really do?

Requoting myself from last page:

The cartridge contains a custom board with an audio enhancement chip.
This game will make use of that audio chip but it can also be played with the console's original audio if desired.

If you mean the game seems to be fully working despite that custom chip not being emulated, then I would guess that FBN only supports the console's original audio, and not the enhanced audio.

either fbn does something wrong or i misunderstood the functioning of the vdp, i thought it takes an other (darker/lighter) color out of the
9bit color universe for darkening and lightening and not generate a complete new color which is not nearly 50%

S/H mode does not pick colors from the standard 9-bit color palette. Many of the colors from S/H mode are just not in the standard palette at all, since they're really 50% darker or brighter variants of the standard colors. Of course, some colors are duplicates and exist in both standard and S/H mode (pure white, as you said, pure black, etc).

Also note that the Sega Genesis / Mega Drive does not follow a linear color ramp. Older emulators don't take that in consideration (Gens, Fusion), while modern ones do (BlastEm). I don't know what FBN does regarding colors.

[eye2eye]

ok,

s/h mode is clarified, function of mct is still unclear.

here you see how the grey results...fbn is not 100% correct but result is acceptable.

Code: [Select]

If you mean the game seems to be fully working despite that custom chip not being emulated, then I would guess that FBN only supports the console's original audio, and not the enhanced audio.
i did not write anything about sound. but "enhanced audio" in the 2. menu is pure marketing, they just play the mp3s.
there is NO fckng enhancement, sfx is fm-sfx in both modes, ambient is either fm or mp3 and fbn does both really well.
the 5200 chip is not really emulated, after taowen's addition mp3 is played directly in fbn without emulation which
is better and faster.

e2e

[dink]

emulation of the 5200 is needed, as it takes care of the interface to playing the samples
(see vx_ in megadrive.cpp)

best regards,
- dink

[eye2eye]

oh i see,

you use it to fetch the track no, volume and such but it is not really used as a sound generator?

e2e

[dink]

oh i see,

you use it to fetch the track no, volume and such but it is not really used as a sound generator?

e2e

The 5200 ic does the commands & playback/sound gen, but in my version
the vx_* functions handle the command interfacing and it passes the relevant
commands to the BurnSamples() engine

best regards,
- dink

[Gab75]

Added the support to 3 new NES/Famicom homebrews:
Adventures of Rip v1.2 (2025)
Christmas Crisis 2 (2024)
Mai Nurse v1.03 (2024-25)

[freedomkhair]

Hi,

Thanks for all your hard work maintaining this wonderful resource.

Would it be possible to add the Europe release of the SNES game R-Type III please, I haven't included a link to the ROM location as I though that would be against forum rules.

Many thanks.

UPDATE : 2025-07-31

Many thanks for adding this to the build. Much appreciated.