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Fix typo, add bonus comment.

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This commit is contained in:
Thomas Harte 2023-12-27 10:52:43 -05:00
parent 001b161568
commit d6073e0407
1 changed files with 3 additions and 1 deletions
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4
Machines/PCCompatible/PCCompatible.cpp
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@ -960,6 +960,8 @@ class ConcreteMachine:
pit_.run_for(1); pit_.run_for(1);
++speaker_.cycles_since_update; ++speaker_.cycles_since_update;
// For original speed, the CPU performs instructions at a 1/3rd divider of the PIT clock,
// so run the PIT three times per 'tick'.
if constexpr (speed == Target::Speed::ApproximatelyOriginal) { if constexpr (speed == Target::Speed::ApproximatelyOriginal) {
pit_.run_for(1); pit_.run_for(1);
++speaker_.cycles_since_update; ++speaker_.cycles_since_update;
@ -1005,7 +1007,7 @@ class ConcreteMachine:
} }
if constexpr (speed == Target::Speed::Fast) { if constexpr (speed == Target::Speed::Fast) {
// There's no divider applied, so this makes for 2*PI = around 2.4 MIPS. // There's no divider applied, so this makes for 2*PIT = around 2.4 MIPS.
// That's broadly 80286 speed, if MIPS were a valid measure. // That's broadly 80286 speed, if MIPS were a valid measure.
perform_instruction(); perform_instruction();
perform_instruction(); perform_instruction();