View Single Post
Old 06 December 2008, 16:59   #27
Toni Wilen
WinUAE developer
 
Join Date: Aug 2001
Location: Hämeenlinna/Finland
Age: 43
Posts: 22,111
Quote:
Originally Posted by andreas View Post
Well, coyote & Toni...

I feared to write some nonsense, hence I had to wait a bit longer...

But Toni indeed mentions extra halfbrite (EHB) mode in the beta log!

Sooo...coyote could it be that your demo which uses the 7-bitplane trick cannot work on a real Amiga 1000 then?
At least the early models - I have one of those, far away from my home atm - were NOT able to do EHB. (iirc)
Technically it has nothing to do with EHB. Denise confuses 7 planes (which does not exists) with EHB mode which is 6 planes, max supported in OCS/ECS.

Demo only uses 5 planes, 6th plane is blank = no EHB effects used.

But there is still possibility that A1000 does not support this hack, with or without EHB capable Denise because this hack expects side-effect both from Agnus (7 planes is identified as 4 plane mode DMA cycle diagram) and Denise (7 planes = 6 plane mode enabled)

A1000 Agnus isn't exactly same internally as Fat Agnus versions. (highly unlikely there are internal bitplane function changes but better test it..)
Toni Wilen is offline  
 
Page generated in 0.05138 seconds with 11 queries