Author
| 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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dhau
msx master
Posts: 1057 |  Posted: May 25 2004, 00:50 |
Quote:
| This trick was well-known in Brazil because it was documented in the book "100 Dicas para MSX", and almost all brazilian programmers have this book.
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Is there an english translation of this book? Would someone do such a translation?
All the english-speaking MSXers will be very grateful  |
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ricbit
msx lover
Posts: 116 | Posted: May 25 2004, 02:02 |
Quote:
| Is there an english translation of this book? Would someone do such a translation?
All the english-speaking MSXers will be very grateful
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There's no translation I know of, but the original can be downloaded here:
www.geocities.com/msxland/msxlivros.html
Anyway, if all you want is to learn how to use the undocumented modes of the MSX-1 VDP, you will do better by downloading Sean Young's documentation at:
www.msxnet.org/tech/tms9918a.txt |
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dhau
msx master
Posts: 1057 | Posted: May 25 2004, 02:24 |
Uhm, thanks
My girlfriend is Portugese, but I think she will kill me if I ask her to translate the book 
Besides she's not very technical |
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pitpan
msx master
Posts: 1389 | Posted: May 25 2004, 08:59 |
Thank you, Ricardo. I will have a look to that book, because I have been looking for that trick for ages!
How could you translate "dicas"? It is like "tricks", isn't it?
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pitpan
msx master
Posts: 1389 | Posted: May 25 2004, 11:59 |
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.
In the excelent Sean Young's documentation he doesn't mention anything close to this.
It is possible to do this in any V9938/V9958 VDP, but not in the standard TMS9918/TMS9928 MSX1 VDP.
If anyone knows how to do this, I would like to know. TMS9918 in "screen 2" mode needs to use 3 tile banks.
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Guillian
msx professional
Posts: 642 | Posted: May 25 2004, 12:18 |
I think it can be done. I'll check and tell you the results.
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BiFi
msx guru
Posts: 3142 | Posted: May 25 2004, 12:21 |
VDP(0)=2
VDP(2)=6
VDP(3)=159
VDP(4)=0
should do the trick just fine.
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pitpan
msx master
Posts: 1389 | Posted: May 25 2004, 12:35 |
Congratulations, Bifi!
I have been looking for this trick for months! And I have tested it in both V9938/V9958 and TMS9929 machines and it works perfectly with all of them.
Thank you very much, BiFi.
Regards,
Ed Robsy
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Guillian
msx professional
Posts: 642 | Posted: May 25 2004, 13:01 |
Bifi is faster than me XD
Anyway, my idea was to use one bank at #0000 and not at #2000.
screen 2
vdp(3)=&h1f
vdp(4)=0
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pitpan
msx master
Posts: 1389 | Posted: May 25 2004, 13:37 |
I will try this one too. Thanks, Guillian!
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Grauw
msx professional
Posts: 1006 | Posted: May 25 2004, 14:11 |
Quote:
| Note:
As a memember of the FutureDisk team I am legally bound to say that Sunrise Magazine sucks and Stefan Boer is an idiot.
Disclaimer:
As a member of the MSX Resource Center I am legally bound to distance myself from the above statement and note that the MRC does not condone nor endorse these kinds of statements.
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*grins abundantly* ^__^
~Grauw |
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[WYZ]
msx lover
Posts: 95 | Posted: May 25 2004, 16:45 |
Quote:
| 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.
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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
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ricbit
msx lover
Posts: 116 | Posted: May 25 2004, 16:56 |
Quote:
| 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.
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Yeah, my memory failed me.
Quote:
| In the excelent Sean Young's documentation he doesn't mention anything close to this.
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It does, I guess you just skipped this part. The trick is the AND mask
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. |
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pitpan
msx master
Posts: 1389 | Posted: May 26 2004, 09:09 |
Thank you, Ricardo. Now it is absolutely clear.
Expect next Karoshi productions to do strange things!
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Yukio
msx professional
Posts: 824 | Posted: January 30 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 ...
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