Dear friends,
Almost as a case, I have discovered a very funny thing that regards the Commodore Plus/4 graphic area... let' s see what it is...
I have tried to run the "Threeve" demo coded by Bauknecht, and then I have done a soft reset to the emulator and started the multicolor hi-res area without clearing the TED's video cache... I expected the pattern to appear, but there was a really unpredictable and amazing result... Let' s see what it is...
This is the first screen, while I was loading the demo, of course...
[edit] Dead pic [edit]
As the demo was loaded, let's do a fast forward of the emulator and let' s come to the end of the demo... here is the screen...
[edit] Dead pic [edit]
Now, let's do a soft reset of the Plus/4 emulator, and let' s introduce the command that switch the video memory in multi color hi-res area...
[edit] Dead pic [edit]
And what does it happen ???? See it... This is the classical pattern of the multi color hi-res area mode (when the command "GRAPHIC 4,0" is introduced...)
[edit] Dead pic [edit]
But, after a soft reset of the emulator, here is the result... woaaa, I don't believe to my eyes !!!!
[edit] Dead pic [edit]
And the same happens if we switch the video memory in normal hi-res mode... Let's take a look inside...
This is the "garbage" reverse bars pattern when the command "GRAPHIC 2,0" was introduced in the Plus/4...
[edit] Dead pic [edit]
But let's see how the pattern disappeared and garbage appears if we insert the GRAPHIC 2,0 command after a soft reset with Threeve loaded...
[edit] Dead pic [edit]
But we haven't finished yet !!!! Let' s start the machine code monitor and let's recall the memory address of the graphic area, $1C00, and let's see what the Plus/4 returns to us... a couple of FF (???) and 00 (BRK) instructions that are set by default and constitute the "heart" of the pattern when the hi-res area mode is blank and not touched...
[edit] Dead pic [edit]
We can also disassemble it...
[edit] Dead pic [edit]
Now, let's try to start the machine code monitor and to call for $1C00 with "Threeve" loaded into the video memory cache and after a soft reset... Hey, how many things have changed !!!!
[edit] Dead pic [edit]
[edit] Dead pic [edit]
Hope you have liked it !!!!
Almost as a case, I have discovered a very funny thing that regards the Commodore Plus/4 graphic area... let' s see what it is...
I have tried to run the "Threeve" demo coded by Bauknecht, and then I have done a soft reset to the emulator and started the multicolor hi-res area without clearing the TED's video cache... I expected the pattern to appear, but there was a really unpredictable and amazing result... Let' s see what it is...
This is the first screen, while I was loading the demo, of course...
[edit] Dead pic [edit]
As the demo was loaded, let's do a fast forward of the emulator and let' s come to the end of the demo... here is the screen...
[edit] Dead pic [edit]
Now, let's do a soft reset of the Plus/4 emulator, and let' s introduce the command that switch the video memory in multi color hi-res area...
[edit] Dead pic [edit]
And what does it happen ???? See it... This is the classical pattern of the multi color hi-res area mode (when the command "GRAPHIC 4,0" is introduced...)
[edit] Dead pic [edit]
But, after a soft reset of the emulator, here is the result... woaaa, I don't believe to my eyes !!!!
[edit] Dead pic [edit]
And the same happens if we switch the video memory in normal hi-res mode... Let's take a look inside...
This is the "garbage" reverse bars pattern when the command "GRAPHIC 2,0" was introduced in the Plus/4...
[edit] Dead pic [edit]
But let's see how the pattern disappeared and garbage appears if we insert the GRAPHIC 2,0 command after a soft reset with Threeve loaded...
[edit] Dead pic [edit]
But we haven't finished yet !!!! Let' s start the machine code monitor and let's recall the memory address of the graphic area, $1C00, and let's see what the Plus/4 returns to us... a couple of FF (???) and 00 (BRK) instructions that are set by default and constitute the "heart" of the pattern when the hi-res area mode is blank and not touched...
[edit] Dead pic [edit]
We can also disassemble it...
[edit] Dead pic [edit]
Now, let's try to start the machine code monitor and to call for $1C00 with "Threeve" loaded into the video memory cache and after a soft reset... Hey, how many things have changed !!!!
[edit] Dead pic [edit]
[edit] Dead pic [edit]
Hope you have liked it !!!!
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