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base:introduction_to_raster_irqs

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base:introduction_to_raster_irqs [2016-06-19 03:49]
pixman Pointed out an error.
base:introduction_to_raster_irqs [2016-12-08 21:46] (current)
cruzer bit 8 = 9th bit
Line 44: Line 44:
  
 lda #$1b   ;as there are more than 256 rasterlines,​ the topmost bit of $d011 serves as lda #$1b   ;as there are more than 256 rasterlines,​ the topmost bit of $d011 serves as
-sta $d011  ;the 8th bit for the rasterline we want our irq to be triggered.+sta $d011  ;the 9th bit for the rasterline we want our irq to be triggered.
            ;here we simply set up a character screen, leaving the topmost bit 0.            ;here we simply set up a character screen, leaving the topmost bit 0.
  
base/introduction_to_raster_irqs.txt ยท Last modified: 2016-12-08 21:46 by cruzer