When a "port" or a "remake" of a games come to be ilegal or is legal? where is the law line?

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Par [WYZ]

Champion (451)

Portrait de [WYZ]

25-05-2004, 16:45

In the excelent Sean Young's documentation he doesn't mention anything close to this.

If anyone knows how to do this, I would like to know. TMS9918 in "screen 2" mode needs to use 3 tile banks.

Take a look for this. There is a link in Sean's webpage:

Hybrid bitmap modes:

http://www.stanford.edu/~thierry1/ti99/tms9918a.htm#hybrid%20bitmap

Par ricbit

Champion (438)

Portrait de ricbit

25-05-2004, 16:56

As I expected, Ricardo, the trick that the "100 dicas" book uses is quite crappy: it simply copies the first tile bank to the second and third banks. That is what I do, but I was looking for a hardware trick to do that.

Yeah, my memory failed me.

In the excelent Sean Young's documentation he doesn't mention anything close to this.

It does, I guess you just skipped this part. The trick is the AND mask Smile

Control register #4 which sets the PG address of the PG has a different
function in mode 2. Only bit 2, PG13, sets the address of the PG (so it's either
address 0 or 2000h). Bits 0 and 1 are an AND mask over the character number.
The character number is 0 - 767 (2FFh) and these two bits are ANDed over the
two highest bits of this value (2FFh is 10 bits, so over bit 8 and 9). So in
effect, if bit 0 of control register #4 is set, the second array of 256
patterns in the PG is used for the middle 8 rows of characters, otherwise the
first 256 patterns. If bit 1 is set, the third array of patterns is used in
the PG, otherwise the first.

Par pitpan

Prophet (3155)

Portrait de pitpan

26-05-2004, 09:09

Thank you, Ricardo. Now it is absolutely clear.

Expect next Karoshi productions to do strange things!

Par Yukio

Paragon (1540)

Portrait de Yukio

30-01-2008, 14:04

I have read that Space Invaders is registered, but only the name ...
Now, for Scramble there seems to be some strange restrictions! Something to do with a video tape!
Xbox Live Arcade, there could be a lot of popular games, well Super Cobra was popular too! There was even a contest to win some Jackets for the Atari 2600 VCS version of the game ...

Par Latok

msx guru (3925)

Portrait de Latok

30-01-2008, 14:22

MOOOOOOOOOOO

Par FiXato

Scribe (1741)

Portrait de FiXato

30-01-2008, 15:01

MOOOOOOOOOOO
Careful what you say Latok; I'm pretty sure that that is copyrighted too ;p

Par [D-Tail]

Ascended (8263)

Portrait de [D-Tail]

30-01-2008, 16:13

Careful what you say Latok; I'm pretty sure that that is copyrighted too Hey, it's a rhyme, so it's true!

And this too!
And this too!
And this too!
...

o_O

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