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James Gregory 2013-12-31 07:56:10 +11:00
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@ -38,8 +38,7 @@ shifted is controlled by bits 2-0 of GC register 3, the Data Rotate
register, which also contains the ALU function select bits (data
unmodified, AND, OR, and XOR) that we looked at in the last chapter.
![](images/25-01.jpg)\
**Figure 25.1**  *Data flow through the Graphics Controller.*
![**Figure 25.1**  *Data flow through the Graphics Controller.*](images/25-01.jpg)
The barrel shifter is powerful, but (as sometimes happens in this
business) it sounds more useful than it really is. This is because the
@ -73,8 +72,7 @@ to display memory. Briefly, the bit mask determines on a bit-by-bit
basis whether the source for each byte written to display memory is the
ALU for that plane or the latch for that plane.
![](images/25-02.jpg)\
**Figure 25.2**  *Bit mask operation.*
![**Figure 25.2**  *Bit mask operation.*](images/25-02.jpg)
The bit mask is controlled by GC register 8, the Bit Mask register. If a
given bit of the Bit Mask register is 1, then the corresponding bit of