MrDave Posted December 24, 2019 Share Posted December 24, 2019 Does anyone know if the screen color can be changed in the color basic rom ? I can easily reprogram the rom.. Quote Link to comment Share on other sites More sharing options...
MrDave Posted December 24, 2019 Author Share Posted December 24, 2019 2 hours ago, MrDave said: Does anyone know if the screen color can be changed in the color basic rom ? I can easily reprogram the rom.. Ask what you can do for your coco .. not what your coco can do for you Quote Link to comment Share on other sites More sharing options...
MarkO Posted December 27, 2019 Share Posted December 27, 2019 Yes, it can be changed... I'm not sure exactly where in the ROM it is, but I can ask some people I know... All the Smart People I know that know the CoCo hang out on a Discord Server.... MarkO Quote Link to comment Share on other sites More sharing options...
MrDave Posted December 29, 2019 Author Share Posted December 29, 2019 Ahh i seen you on cocotalk.. i'm dave of dave & sharron. Lol i suppose if i really wanna play with the roms i could swap in a static ram to figure everything out by trial.. but someone must have done it already... Thanks Quote Link to comment Share on other sites More sharing options...
jhd Posted December 29, 2019 Share Posted December 29, 2019 On 12/24/2019 at 7:35 AM, MrDave said: Does anyone know if the screen color can be changed in the color basic rom ? I can easily reprogram the rom.. I was under the impression that the text (and background) colour was fixed by the 6847 video chip. I have never seen any software that changes the standard BASIC/OS screen colour. There is a software way to switch the screen to an orange colour; it is used in the cartridge game Poltergeist. Alas, I have long since forgotten the details. It is also possible to force inverted video (light green text on a darker green background), but that requires a hardware modification. If you look at some of the few other applications of the 6847 video chip (including a prototype computer adapter for the Atari 2600!), they all have the same 32x16 green screen with black text. Quote Link to comment Share on other sites More sharing options...
MrDave Posted December 29, 2019 Author Share Posted December 29, 2019 When i piggy back soldered in my 6309 on top of the 6809 cpu a couple of pins had a bad connection and funny enough the background was orange with no text.. but im sure the basic rom must till the vdg which starting mode to use... Quote Link to comment Share on other sites More sharing options...
MrDave Posted January 2, 2020 Author Share Posted January 2, 2020 Funny from basic i can poke at ff22 to change modes to real lower case.. orange background orange or green outside border and inverse the screen too ! It looks like orange on dark red really cool.. but as soon as basic tried to print it put it back to green lol. If i cant find it in rom i may hardware attack the vid chip ! Quote Link to comment Share on other sites More sharing options...
MrDave Posted January 5, 2020 Author Share Posted January 5, 2020 (edited) Ok so I have this figured out now On alot of coco2's even in xroar ( coco2b mode) Poke &H0167,&H39 Poke &HFF22,&H78 The first command locks out basic from resetting the vdg the second is a poke into the vdg the 7 can be a 7,6,5,4,3,2,1,0 and the second digit an 8 for orange or 0 for green The top bits are for wideScreen..inverse,,lowercase. Try it out ! Edited January 5, 2020 by MrDave Quote Link to comment Share on other sites More sharing options...
MrDave Posted January 5, 2020 Author Share Posted January 5, 2020 (edited) My sweet coco2 6309e / 6809e ..dual cpu ..dual eprom ! Edited January 5, 2020 by MrDave Quote Link to comment Share on other sites More sharing options...
jhd Posted January 7, 2020 Share Posted January 7, 2020 On 1/4/2020 at 6:42 PM, MrDave said: Was there any commercial (or even amateur) software that used this mode? I am unsure if I like it more or less than the standard green screen. Neither is choice is great. Quote Link to comment Share on other sites More sharing options...
MrDave Posted January 7, 2020 Author Share Posted January 7, 2020 Not sure about commercial software.. but text based applications like edtasm etc are alot nicer like this Quote Link to comment Share on other sites More sharing options...
MarkO Posted January 9, 2020 Share Posted January 9, 2020 On 12/28/2019 at 5:53 PM, MrDave said: Ahh i seen you on cocotalk.. i'm dave of dave & sharron. Lol i suppose if i really wanna play with the roms i could swap in a static ram to figure everything out by trial.. but someone must have done it already... Thanks Yep, that's me... One of the CoCoTALKers that's been there since the First Show... The Tandy CoCo Discord Server is https://discord.gg/4J5nHXm MarkO Quote Link to comment Share on other sites More sharing options...
MarkO Posted January 9, 2020 Share Posted January 9, 2020 On 1/4/2020 at 5:42 PM, MrDave said: Ok so I have this figured out now On alot of coco2's even in xroar ( coco2b mode) Poke &H0167,&H39 Poke &HFF22,&H78 The first command locks out basic from resetting the vdg the second is a poke into the vdg the 7 can be a 7,6,5,4,3,2,1,0 and the second digit an 8 for orange or 0 for green The top bits are for wideScreen..inverse,,lowercase. Try it out ! Good Information.... MarkO Quote Link to comment Share on other sites More sharing options...
Mr SQL Posted January 11, 2020 Share Posted January 11, 2020 On 1/6/2020 at 10:56 PM, jhd said: Was there any commercial (or even amateur) software that used this mode? I am unsure if I like it more or less than the standard green screen. Neither is choice is great. Yes I thought it was cool for a text adventure: Quote Link to comment Share on other sites More sharing options...
John_L Posted January 16, 2020 Share Posted January 16, 2020 If you change the poke to &HFF22 to &H70 you'll get inverted (light text on dark) instead of light background with dark text. Quote Link to comment Share on other sites More sharing options...
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