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Old 13 October 2019, 20:59   #3
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geldo79's Avatar
Join Date: Oct 2019
Location: Eydelstedt / Germany
Age: 40
Posts: 32
Agree. Very nice description! Thanks! But there are still (at the moment ) two things I don't understand.

1. Why does my bob setting/buffering/clearing routines work perfectly? I do not use 16 additional pixels to the right of my bob. It's only 16x16. I am confused . And maybe this brings me to the second question..

2. How do these BLTAFWM and BLTALWM registers work. Everywhere I read that these registers are used to ignore the first or last word of each line, because the shifting e.g. to the right shifts zeros in from the left. But when I extend my bob 16 pixels to the right, i guess that if the area is empty it contains all zeros. What is the problem then if zeroes are shifted in from the left.

Can anyone explain this?

Greetings Christian
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