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Dwangi
Registered: Dec 2001
Posts: 130 |
$e544 ?
Hope this is the right forum to put a question..
I have heard so much comments of what is right and wrong when setting up a multicolor screen (so it also work on old c64:s´)
lda color
sta $0286
jsr $e544
thats fuck up on an old c64 ??? |
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Stryyker
Registered: Dec 2001
Posts: 469 |
Just use a simple copy loop. Early ROMS used the background colour or something, well didn't always set the colour RAM to expected colour :) |
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Perff
Administrator
Posts: 1684 |
How many people actually uses the ROM in demos?
I never did. All my code starts with:
sei
lda #$35
sta $01
but i've seen a lot of demos and stuff with the rom switched on. Why is that? Then you have less memory. :)
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anonym
Registered: Jan 2002
Posts: 276 |
I normally only turn the ROM off if I need to... However in Trackmos it's something different... It certainly gets difficult when integrating what different coders have created ;-)
/Frank |
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QuasaR
Account closed
Registered: Dec 2001
Posts: 145 |
The old $e544 doesn't take the colour from $0286 but it take the background-colour. Some demos doesn't work because of this bug and even decruncher seems to fuck up... Try RED STORM on an old C64... |
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Rough
Account closed
Registered: Feb 2002
Posts: 1829 |
Is there an image of that old ROM available somewhere on the net to use in emulators?
I'd also like to have Swedish (different charset) etc. ROMs.
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WVL
Registered: Mar 2002
Posts: 924 |
do this :
lda #charcolor
sta $0286
sta $d021
jsr $e544
lda #bgcolor
sta $d021
always works, but has this annoying background flash..
use
lda #147
jsr chrout
otherwise.. same as shift-home, but slow
or make a simple loop routine..
WVL |
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Zyron
Registered: Jan 2002
Posts: 2381 |
lda #col
sta $d021
jsr $e536
works on both old & new c64s. ;) |
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lft
Registered: Jul 2007
Posts: 369 |
This behaviour is actually explained in Bagnall's On The Edge. Early revisions of the VIC had a problem where small dots of the foreground colour would flicker randomly all over the screen. Obviously, this would have given potential customers a really bad first impression of the C64. There was no time to fix the hardware, so they added a workaround to the kernal ROM, where the current background colour would be stored into all colour RAM locations corresponding to blank characters on the screen. |
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tlr
Registered: Sep 2003
Posts: 1807 |
Quote: lda #col
sta $d021
jsr $e536
works on both old & new c64s. ;)
$e544 sets color mem to white in kernal rev1... |
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JackAsser
Registered: Jun 2002
Posts: 2038 |
THIRTEEN YEARS BETWEEN TWO POSTS!!!! :D Horray for Zyron - The thread awakener! ***Svindlande*** |
... 6 posts hidden. Click here to view all posts....
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