Re: HGR inside DHGR

["Bryan Parkoff" <nospam@nospam.com>]

"mdj" <mdj.mdj@gmail.com> wrote in message 
1152165129.037877.28290@v61g2000cwv.googlegroups.com">news:1152165129.037877.28290@v61g2000cwv.googlegroups.com...
>
> BLuRry wrote:
>> > B,
>> >
>> >    Sorry.  My response was too harsh.   I do want to understand what
>> > you are trying to say, but am often just not able to.   I will keep
>> > trying.
>>
>> If it makes either of you feel better, I speak 6502 better than I can
>> speak English.  Much easier language, in my opinion.
>
> I agree it would be handy, when facing a difficult situation to simply
> perform an absolute indirect indexed jump rather than deal with all
> that 'diplomacy' gibberish ;-)
>
> Btw Bryan, it seems logical that LORES maps 100% perfectly to DHR, as
> the colours are identical, the artifacting would also be the same, but
> it's nice to confirm that it does indeed come out that way. Do remember
> that there is a double lores mode as well - if you write a program that
> uses double lores page 2, you'll have done something not many have :-)
>
> What exactly is your goal? Are you trying to determine an 'ideal'
> mapping of Apple II graphics onto a higher resolution display?
>
> Matt
>
Matt,

    Yes, it is what I meant.  NTSC pixels run at 14MHz still use artifact 
colors.  It is not a problem as long.  You can still write LORES in both 
40/80 columns into DHGR.  HGR can be done in DHGR, too.
    I have written a program to convert each HGR byte to two bytes.  It is 
the way how each HGR byte is like 80 column in 40 column as 14MHz so it is 
converted to 7MHz in 80 column.  Then 7 MHz is splited into two bytes.  Two 
bytes are 14MHz from splited 7 MHz.  Each left byte go in bank 1 and each 
right byte go in bank 0.  Both Bank 0/1 display both bytes to show emulated 
HGR in DHGR.
    One problem is with color mapping, but pixel structure is 100% perfect. 
For example, in DHGR, HCOLOR=1 is orange, HCOLOR=2 is blue, HCOLOR=5 is 
green, and HCOLOR=6 is violet.  You may be surprised to claim that HCOLOR is 
wrong.  Well, it is opposite color because color mapping in both 40/80 
column are not the same.  40 Column color mapping has to be rotated in the 
right to match 80 column color mapping.  I have unanswered question why 
40/80 column color mapping are different.
    You can still be able to draw mixed LORES 40/80 and HIRES 40 into DHGR. 
It looks great.  Think about Money Munchers how Bob Bishop designed to use 
$C050/$C051 switches, but it is not needed because DHGR is activated.  No 
annoying with flicker back and forth.

Bryan Parkoff