how to set the border colour in screen 7?

Prophet (3028)

29-06-2004, 19:12

when i set the border colour (using the normal procedure of the screens 0 up to 6) in the screen 7, i only can obtain blue, red, and magenta colours, i can't get the white because the green signal not work, or maybe work in a diferent way.

How to do that in screen 7?

By [D-Tail]

Ascended (8259)

29-06-2004, 19:17

AFAIK the color settings in screen 7 are the same compared to other screens... Maybe some hardware is malfunctioning? Did you try to make it work on another MSX (or emu, perhaps)?

By BiFi

Enlighted (4348)

29-06-2004, 19:59

ld a,colorcode
out ($99),a
ld a,128+16
out ($99),a
ld a,%0rrr0bbb ; red and blue palette values
out ($9a),a
ld a,%00000ggg ; green value
out ($9a),a

By Grauw

Ascended (10604)

29-06-2004, 20:08

I don't understand either, screen 7 should indeed be exactly like screen 5, etc. The only different screen mode is screen 8, which has a pre-set palette iirc.

~Grauw

By [D-Tail]

Ascended (8259)

29-06-2004, 20:12

Yeah, if you meant 'Graphics mode 7', I'd understand . Try to do something with the color/backdrop register.

By flyguille

Prophet (3028)

29-06-2004, 20:12

oh! shit, i mean how to do in the screen 8!!, simply i confuse the numbers.

By flyguille

Prophet (3028)

29-06-2004, 20:14

ld a,colorcode
out ($99),a
ld a,128+16
out ($99),a
ld a,%0rrr0bbb ; red and blue palette values
out ($9a),a
ld a,%00000ggg ; green value
out ($9a),a

oh, but this if for set a palette...

i want to set the border colour than is not a pointer to a pallette.

By BiFi

Enlighted (4348)

29-06-2004, 20:55

You can change the back drop color by changing R#7 to the desired color code.

ld a,backdropcolor
out ($99),a
ld a,128+7
out ($99),a

By flyguille

Prophet (3028)

29-06-2004, 21:46

You can change the back drop color by changing R#7 to the desired color code.

ld a,backdropcolor
out ($99),a
ld a,128+7
out ($99),a

and that is just that i already do!!.

check the demo of the MNBIOS

in screen 0 (screen 5) (in MNBIOS is screen -m0)
in screen 2 (screen 7) (in MNBIOS is screen -m2)

The border colour work just as you comment here.

But, in (screen 8) (in MNBIOS is screen -m3)

the same routine to set the border colour fail, just one as you wrote here.

test using

COLOR -b&HFF , in MNBIOS

that is white in all other screens mode. and in screen 8 only can set the RED and BLUE value, not the GREEN. why? what's changed?

By flyguille

Prophet (3028)

29-06-2004, 22:40

Well, i see TFM and indeed under (graphics mode 7) on the book page 50, say:

THE register is #7 and the low 4 bits set the colour (i think as a pointer to a palette).

Then, on the book page 52, on the point 3, under the same tittle, say:

IS JUST RGB. +

BUt ins't RGB, because when i do the following

COLOR 0,0,0:SCREEN 8: VDP (7)= &HFF

i got a "magenta" (100% blue + 100% red + 0% green).

and graduating the register number, i obtain all the blues and red graduations like

bits 2-0 = blue setting
bits 6-5 = red setting

bit 3 nothing

bit 7 nothing

and as the openMSX reproduce the same effect, so , how is it?

By Sonic_aka_T

Enlighted (4130)

30-06-2004, 01:27

I dunno, but if I check on openMSX it does use RGB. I only tested it in BASIC, but VDP reg #07 seems to change accordingly. If I COLOR ,,255 in BASIC the border turns white and VDP reg #07 contains the value FF. If I COLOR ,,3 in BASIC the border turns light blue and VDP reg #07 contains the value 03. The rest of the color pallette seems to be there too... It seems to use GGGRRRBB instead though...