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(Mostly) randomises the 9918 start position.

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This commit is contained in:
Thomas Harte 2018-10-26 21:02:56 -04:00
parent e02aa885d8
commit 8652d8b23d
1 changed files with 7 additions and 5 deletions
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12
Components/9918/9918.cpp
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@ -10,6 +10,7 @@
#include <cassert>
#include <cstring>
#include <cstdlib>
using namespace TI::TMS;
@ -73,11 +74,12 @@ Base::Base(Personality p) :
mode_timing_.end_of_frame_interrupt_position.row = 193;
}
// Establish that output is delayed after reading by `output_lag` cycles.
read_pointer_.row = 0;
read_pointer_.column = 342 - output_lag;
write_pointer_.row = 1;
write_pointer_.column = 0;
// Establish that output is delayed after reading by `output_lag` cycles; start
// at a random position.
read_pointer_.row = rand() % 262;
read_pointer_.column = rand() % (342 - output_lag);
write_pointer_.row = read_pointer_.row;
write_pointer_.column = read_pointer_.column + output_lag;
}
TMS9918::TMS9918(Personality p):