[atari7800] Re: Mode 160B don't works for me...
- From: "Dan Boris" <dboris@xxxxxxxxxxx>
- To: <atari7800@xxxxxxxxxxxxx>
- Date: Sun, 31 Oct 2004 09:59:58 -0500
What assembler are you using? DASM doesn't understand
incbin roguesword.bmp
Dan
> -----Original Message-----
> From: atari7800-bounce@xxxxxxxxxxxxx
> [mailto:atari7800-bounce@xxxxxxxxxxxxx] On Behalf Of Manuel Rotschkar
> Sent: Sunday, October 31, 2004 7:41 AM
> To: atari7800@xxxxxxxxxxxxx
> Subject: [atari7800] Mode 160B don't works for me...
>
>
> Hi there!
>
> Phew... I'm trying this for hours now, but I don't get to
> display anything
> in this mode. Meanwhile I tried so many things, actually by
> pure accident
> alone I should've managed to get at least some garbage
> displayed on the
> screen...
>
> Ok, what did I do so far...
>
> I wrote a program that strips of the header of a 16-color
> windows Bitmap,
> does the bitwise swapping of the 2-Bit pairs as described in the 7800
> Guide.
> (First I'm changing the nibbles 4,8&12 to 13-14, leaving 0 as
> transparent)
>
> That results in a 16000 byte data block I simply include in
> my source file.
>
> My Code does this:
> - It writes %01000000 to the CRTL register
> - It writes dummy values to all color registers.
> - It sets the DLL pointer, then loops forever.
>
> My DL entries look like this:
>
> byte $00,%11000000,$80,%10000001,0
> byte $20,%11000000,$80,%10000001,64
> byte $40,%11000000,$80,%10001001,128
> byte $00,$00
>
> I attached the full source and my converted bitmap. My last
> hope is that
> one of you will see what I'm doing wrong here...
>
> Greetings,
> Manuel
>
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