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Correct Nick interrupt prediction.

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This commit is contained in:
Thomas Harte 2021-07-03 00:05:13 -04:00
parent 964d2d4fa4
commit 278671cdb9
1 changed files with 3 additions and 5 deletions
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8
Machines/Enterprise/Nick.cpp
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@ -463,11 +463,9 @@ void Nick::set_output_type(OutputType type, bool force_flush) {
// MARK: - Sequence points.
Cycles Nick::get_next_sequence_point() const {
// TODO: the below is incorrect; unit test and correct.
// Changing to e.g. Cycles(1) reveals the relevant discrepancy.
// return Cycles(1);
constexpr int load_point = 2*16;
constexpr int load_point = 16; // i.e. 16 cycles after the start of the line, the
// interrupt line may change. That is, after the
// second byte of the mode line has been read.
// Any mode line may cause a change in the interrupt output, so as a first blush
// just always report the time until the end of the mode line.