2600 Off the Wall F6 banking with doubled file size errors

[Shawn]

Hey All,

 

Anyone have any idea why Off The Wall would fail to run properly 

when the file is doubled up to 32k instead of 16k but still being

ran with F6 bankswitching? It runs fine in it's native 16k size

but as soon as it's doubled up to fill a 32k chip it goes whacky.

Almost all programs don't mind being doubled up to fill extra

space from my experience but there are the odd exceptions.

It even does this in Stella via emulation. Same thing happens

when quadrupled to fill 64k but still ran with F6 banking. Does

the program point at something that makes it mad when

at this larger file size? I ask as I have a friend who made

a hack of the game and I was putting it onto a real cart for

him but I only have 32k and 64k chips on hand. Doesn't matter

if I ground the extra address lines either. Same problem. Hope

this is something simple that I'm just overlooking.

 

Thanks,

Shawn

[+stephena]

This ROM is actually F6SC (F6 + Superchip RAM).  If I double the ROM and use '-bs F6SC', it works fine.  But if using '-bs F6', it screws up the same way as the 16KB version.

[Shawn]

1 hour ago, stephena said:

This ROM is actually F6SC (F6 + Superchip RAM).  If I double the ROM and use '-bs F6SC', it works fine.  But if using '-bs F6', it screws up the same way as the 16KB version.

 

Makes a heck of a lot more sense. Didn't recall it had the extra ram. Thanks for the info.