Atari System Reference Manual - Missing Text
Carsten Strotmann
DuHamel, 1987) around in the internet, and all have some text missing in
Chapter 15 Displaylist:
CHAPTER 15
DISPLAY LISTS
[some of this file was lost...]
chip also has a memory scan counter. This register scans the display
buffer for data to be interpreted and displayed. Once loaded, the
memory scan counter's 4 most significant bits are fixed. The result
is that the memory scan counter cannot cross a 4K memory boundary
(i.e. $AFFF to $B000) without being reloaded.
DISPLAY LIST INSTRUCTIONS
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I have found the original text on some disks:
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CHAPTER 15
DISPLAY LISTS
The program which runs the ANTIC chip is called the display list. Much
like a microprocessor, the ANTIC chip has a program counter, called the
display list counter.
The display list counter is a 16 bit register. However, the six most
significant bits are semi-fixed. These bits can only be changed with a
jump instruction. The result of this is that the display list counter
cannot cross a 1K memory boundary (i.e. $A3FF to $A400) without using a
jump instruction.
The ANTIC chip finds the address of the display list in DLISTL [$D402
(54274)] and DLISTH [$D403 (54275)]. SDLSTL [$0230 (560)] and SDLSTH
[$0231 (561)] are the shadow registers for DLISTL and DLISTH.
The ANTIC chip also has a memory scan counter. This register scans the
display buffer for data to be interpreted and displayed. Once loaded, the
memory scan counter's 4 most significant bits are fixed. The result is
that the memory scan counter cannot cross a 4K memory boundary (i.e. $AFFF
to $B000) without being reloaded.
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If you host some version of this manual, please update you version ;)
Best regards
Carsten Strotmann