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Wrathchild

Member Since 25 Jun 2002
OFFLINE Last Active Today, 11:55 AM

Posts I've Made

In Topic: Quantizator

Wed May 9, 2012 3:44 AM

View Post1NG, on Wed May 9, 2012 3:17 AM, said:

I would appreciate any hint on how to get the source compiled with VS C++ ...

I grabbed some Allegro libraries from here

In Topic: Quantizator

Fri May 4, 2012 2:46 AM

The grey bias was seen when I worked on a color picker, would be interesting however to incorporate that distance algorithm into this tool though.

In Topic: Interesting discovery regarding GORF cartridge

Fri Mar 30, 2012 11:42 AM

View PostGunstar, on Fri Mar 30, 2012 8:50 AM, said:

Regardless of what GORF and some OS's are doing with page 3, I'm not talking about swapping to an OS without the check, I'm talking about running it regardless of what OS is enabled. Please re-read my first post.
Yes, I had read the post, but apologise for failing to conclude that in all likelyhood the currently selected O/S is not being activated due to the Select key overriding.

As Rybags' subsequent posts have explained, I'd concur with his theory on the menu-OS. I'm not sure how the choice is 'stored' (PICs can have their own EEPROM) so either the Select key state can be detected during the PIC's own loading and then bypass the stored choice to default to the menu-OS, or the menu-OS could itself could normally read the O/S choice, select and launch it or present the menu if the Select is held.

GORF has the 'cartridge option' value '4' and so will initialize and start the cartridge which is standard on most game cartridges so are other titles run the cart or the menu if Select it held?

In Topic: Is a 5200 Gauntlet possible?

Fri Mar 30, 2012 6:31 AM

Having squeezed the original into a 128KB cart for the A8 I can say a 5200 port wouldn't be so straight forward as you'd need to relocate most of the RAM memory usage to the lower 16K and also I'd think that working RAM required maybe > 16K.

In Topic: Interesting discovery regarding GORF cartridge

Fri Mar 30, 2012 4:39 AM

I've looked into the Gorf cart in the past as part of non-XL working game investigations.

The cart version is utilizing page 3 for game data and so in the XL/XE operating system there is a 'background' check (IIRC) for detecting whether carts have been removed/inserted by comparing a byte in page 3 with one in hardware registers. Therefore because Gorf is rewriting the value in this address the O/S check will result in the machine going into an infinite loop in the O/S code. So it would make sense that swapping to another OS that doesn't implement this check would let the game run OK (assuming it too doesn't have anything importing in page 3!).

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