Back to the Future MSX2 and emulators

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Par Sylvester

Hero (531)

Portrait de Sylvester

06-05-2021, 15:54

@tfh you version isn't fixed, load"autoexec.bas" gives a Bad FAT error.

Also the original version was released on 2 Single side disks (with label 1 and 2), or was the second disk only a user disk?

Par gdx

Enlighted (4491)

Portrait de gdx

06-05-2021, 16:21

Jipe wrote:

why change D0 02 at 00013h and replace by 68 01 ?

Because I was wrong. We must leave it as-is.

Par tfh

Prophet (2898)

Portrait de tfh

06-05-2021, 18:05

Sylvester wrote:

@tfh you version isn't fixed, load"autoexec.bas" gives a Bad FAT error.

It seems to boot fine in OpenMSX?
Re-changed the bootsector.

Par SLotman

Paragon (1236)

Portrait de SLotman

06-05-2021, 18:27

What could explain the dsk discrepancy is that here in Brazil we had 5.25 720kb disk drives. They were "adapted". Some even had a switch to change from 360 to 720 and vice-versa.

It wasn't unusual to just copy 360k "sector" disks into 720k ones. The game runs normally in MSX that way, so it should work on emulators as well, I think.

Par tfh

Prophet (2898)

Portrait de tfh

06-05-2021, 18:32

Well, maybe it's something the OpenMSX team should look into if they want to emulate the correct behaviour.

Par Sylvester

Hero (531)

Portrait de Sylvester

06-05-2021, 18:47

Just looked in the autoexec.bas source, if you load the save file and your score is higher then 31 (i guess sc = score), it asks for disk 2 and then loads "NO3". So I think somebody has copied the files of disk 2 to disk 1 because there was enough space.
If I add an extra line 201 SC=32 it asks for disk 2 when I load the save game and when I press space it loads and then keeps beeping till I reset the computer. So I wonder if the game is complete and if you can finish it till the end.

Par tfh

Prophet (2898)

Portrait de tfh

06-05-2021, 19:23

LOL... Sounds like this game is a "bad dump" and that there is no 100% correct dumped version.

Par SLotman

Paragon (1236)

Portrait de SLotman

06-05-2021, 20:02

If is a 100% correct dump of the disk I purchased back in the day here in Brazil. There were no errors reading any sector and there isn't any kind of 'hard' copy protection on it, besides reading the values of 3 sectors (which should read as F5h, F6h and F7h)

If it works all the way or not, I have no idea. Back in the day my Brazilian MSX only displayed crazy ascii chars on texts (the game uses the built in chars that in Brazil were replaced in the ASCII table).

I don't know japanese either, so I don't know what I'm doing to properly test it.
But I bought it back in the 80s, and it was a single disk, not 2 - so maybe whoever pirated it at the time (*cough* Nemesis *cough*), could have made a mistake.

Par SLotman

Paragon (1236)

Portrait de SLotman

06-05-2021, 20:04

BTW, I modified my own BlueMSX fork to get it to work as is, no need to cut the dsk in half ;)

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