Overscan games

[felow]

Wondering if already exists a post in the forum listing CPC games that uses overscan. Or, in case, if anyone can propose a list. Thx.

[ComSoft6128]

Forgive my ignorance but does this mean games with an overscan loading screen or screens?
Were there any CPC games that used overscan throughout the game?
Is the larger screen in Mission Genocide an example of an overscan technique in use?

Cheers,

Peter

[Unoquepasa]

Plumpy, Axys and Xyphoes Fantasy.
And remember knight force loading screen
Un saludo

[DanyPPC]

Donkey Kong (Ocean)
Frogger CPC+

Pac Man Arcade
Phoenix Arcade Emulator


...but there are many more 

[arnoldemu]

Wondering if already exists a post in the forum listing CPC games that uses overscan. Or, in case, if anyone can propose a list. Thx.

cpc-power is your friend.

I guess there must be similar ways to search cpcrulez..?

This lists a lot:
http://www.cpc-power.com/index.php?page=database&lemot=Overscan%20full

In this the overscan may only be used within the title screen or it could be the entire game.

For mission genocide and similar that use top/bottom borders:
http://www.cpc-power.com/index.php?page=database&lemot=Overscan%20vertical

Using side borders:
http://www.cpc-power.com/index.php?page=database&lemot=Overscan%20horizontal

[felow]

Yes, I mean CPC games that use overscan throughout the game.
Thanks a lot arnoldemu for the very useful links to CPCPower. Quite strange they didn't include also GHOULS 'N GHOSTS in the vertical list...

[roudoudou]

There is very few overscan games (i mean, real overscan, not 16K screens)


xyphoes fantasy (not all the game)
http://www.cpc-power.com/index.php?page=detail&num=1433


notice that there is still a little border but the game IS overscan since the main screen has more than 16K without split
it's the only arcade game i know in overscan, all other are board games but maybe someone know another one?

EDIT: Oooops i forgot Megablaster!
http://www.cpc-power.com/index.php?page=detail&num=11523

groops
http://www.cpc-power.com/index.php?page=detail&num=2369


sudoku master
http://www.cpc-power.com/index.php?page=detail&num=3963



All the games mentionned before are not overscan. They have 16K regular screens with proportions changed

[Targhan]

You also have Imperial Mahjong (full screen) and Orion Prime ("horizontal overscan"). Both links are in my signature below.

[roudoudou]

Correct for Imperial Mahjong!


Orion Prime use regular 16K screen (flattened) 

[Shaun M. Neary]

I'm shocked that we've gotten this far into the thread and nobody mentioned the amazing Prehistorik II yet!


Also I think Crazy Cars 2, Tetrix, and Super Cauldron also used it.

[roudoudou]

Prehistorik II & Super Cauldron do not use overscan but very minded tricks (rasters) to make you believe the screen is bigger. But it's not 

[ComSoft6128]

Not being a programmer or a hardware guy makes me ask what might be an obvious question , can anyone tell me why overscan was not implemented more frequently on the CPC?
Was it due to the limitations of the Z80 or because 64k/128k machines lack the memory to perform this function under normal use and require extensive extra code to do this?

Cheers,

Peter

[roudoudou]

To sum up

Video controler can read only the first 64K of memory
Overscan means 32K of video buffer (24K are visible so you can hide data/code in the video page but it's tricky)
So if you need to make a page flipping you already consume all the memory
And the instructions back in the days were -> do 64K games for CPC

[kawickboy]

And the vertical one ? Used in ghouls'n'ghosts and some pinball games.

[DanyPPC]

A technical question:


what is the resolution for the full overscan area ?

[roudoudou]

A technical question:


what is the resolution for the full overscan area ?

768x272 (mode 2 resolution)
or 384 width in mode 1
or 192 width in mode 0

[GOB]

272 is not sufficient on a hot CPC+ screen !!!

[GUNHED]

For our Giana Clone we use im Mode 0: 208 * 288


This war recorded using an emulator, so I don't know if it shows all pixels.



https://www.youtube.com/watch?v=_OnEdP0DK5w

[arnoldemu]

For our Giana Clone we use im Mode 0: 208 * 288

Any progress news that you can share?

It would be nice to see this running on my cpc one day

[Ast]

You mean, running without future os ?

[GUNHED]

You mean, running without FutureOS ?

Which won't happen ever.    Because it's supposed to run with 128 KB RAM at the end, and this can't be achieved when it needs to carry 10 KB or 20 KB from FutureOS with it. 


However, after I got distracted during the last years more often I thought more recently more often to continue work on it. 

[tastefulmrship]

I was always impressed by MISSION GENOCIDE; mainly for the full-height vertical scrollin!