Apple-2-SW/apple2_hgr_font_tutorial
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Fix bogus javascript scroll HGR up

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michaelangel007 2016-01-09 19:30:35 -08:00
parent db3ea378be
commit dfb9fd9f9d
1 changed files with 4 additions and 6 deletions
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@ -1760,7 +1760,7 @@ Here's the assembly to scroll the HGR screen up one pixel:
1887: .2 RTS
```
The bulk of the ScrollHgrUpPixel() was generated with this Javascript program:
The bulk of the ScrollHgrUpPixel() was generated with this Javascript program [scroll_hgr_up_pixel.html](scroll_hgr_up_pixel.html):
```Javascript
var hgr = [];
@ -1775,8 +1775,6 @@ The bulk of the ScrollHgrUpPixel() was generated with this Javascript program:
return ("0" + byte.toString(16)).toUpperCase().substr(-2)
}
var useX = false;
var address = 0x1402, out = "";
for( var y = 0; y < 192/8; ++y )
for( var x = 0; x < 8; ++x )
@ -1784,12 +1782,12 @@ The bulk of the ScrollHgrUpPixel() was generated with this Javascript program:
var row = y*8 + x; // Assumes hgr[] has a dummy 193rd scanline!
var src = hgr[ row + 1 ];
var dst = hgr[ row + 0 ];
var mem = (useX ? "BD " : "?? " )
var mem = "BD "
+ byte2hex$( (src >> 0) & 0xFF ) + " "
+ byte2hex$( (src >> 8) & 0xFF ) + " "
+ (useX ? "9D "
+ "9D "
+ byte2hex$( (dst >> 0) & 0xFF ) + " "
+ byte2hex$( (dst >> 8) & 0xFF ) + " "
+ byte2hex$( (dst >> 8) & 0xFF ) + " ";
var txt = " "
+ " LDA $" + src.toString(16).toUpperCase() + ",Y "
+ ": STA $" + dst.toString(16).toUpperCase() + ",Y "