Aleste 2 ROM

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Par ricbit

Champion (438)

Portrait de ricbit

17-01-2015, 02:26

I've been working on a ROM version of Aleste 2. Here's a beta for download:

Right now the intro demo kind of works and the first 4 stages are playable (on hard). I have removed some things that don't make sense anymore (such as loading screens, and screens asking for you to change the disks - this is automatic now). But I plan to add improvements to the game in the near future, such as playing the samples using the turboR PCM for a better sound quality.

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Par Vampier

Prophet (2415)

Portrait de Vampier

17-01-2015, 07:47

Looks great! I played through all 4 stages and the I get to the 'insert disk b' screen.

One thing I saw that wasn't going as it should was the Aleste 2 intro screen. Looks like VDP reg 23 needs to be reset to 0.

Par giuseve

Paladin (814)

Portrait de giuseve

17-01-2015, 07:59

Nice project. I think that a must to do would be to try to solve the flickerig when too much enemies are on the screen.
Anyway great job!

Par Manuel

Ascended (19685)

Portrait de Manuel

17-01-2015, 09:10

Fun project! I didn't see the reg23 issue though. Perhaps it depends on the MSX type used. (I used an MSX2.)


Enlighted (6978)

Portrait de ARTRAG

17-01-2015, 09:21

Great project ! I'd love to see in rom more classics on disk.

Par ericb59

Paragon (1126)

Portrait de ericb59

17-01-2015, 17:55

Great !
I know what to do with your final rom ! Eek!

(Well, if it not more than 2048K...)

Par valkyre

Paladin (704)

Portrait de valkyre

17-01-2015, 18:36

I like what your saying eric

Par ricbit

Champion (438)

Portrait de ricbit

17-01-2015, 19:41

@Vampier I think you found a bug on the original game. If I try to press space during the scrolling, using the original disks, the game freezes. I can fix this on my version, but it's curious no one noticed that before Smile

@ARTRAG Regarding other classics, I would love if someone did the same to Xak 2. It annoys the hell out of me when the music stops to load the text some character is speaking. In a ROM version the music wouldn't need to stop.

Par ricbit

Champion (438)

Portrait de ricbit

26-01-2015, 14:08

I found two more bugs on the original code!

The first one is that the game starts on hard if you boot with the demo disc. I always thought this was by design, but turns out it is a bug. The game expects all ram to be zeroed out, but some machines will fill it with FF during boot. The game then interprets the FF as hard. If you boot from the first game disc, then it properly zero out the variable storing the difficulty.

The second one is that the game does not always wait until a vdp command is finished before issuing a new one. In fact, it assumes all disk reads are long enough for a command to complete (which of course is not true in my version reading from rom). I had to add a busy wait to fix some graphic glitches.

Par ricbit

Champion (438)

Portrait de ricbit

26-01-2015, 14:39

Here's the latest version, it fixes the two bugs described above, and reintroduces the sound stage (keep SELECT pressed during start):

Here's source code so far:

Par syn

Prophet (2135)

Portrait de syn

26-01-2015, 14:54 that demo disk bug was already fixed :)

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