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More clearly check opposite phases

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And prev should not be checked
This commit is contained in:
Peter Evans 2018-03-21 15:11:03 -05:00
parent 443f9d1a01
commit a461194a63
1 changed files with 3 additions and 1 deletions
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4
src/apple2.dd.c
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@ -269,7 +269,9 @@ apple2_dd_phaser(apple2dd *drive)
// If the opposite cog is also on, then our accounting is for
// naught; nullify the step movement.
if ((next & (prev << 2)) || (next & (prev >> 2))) {
if (((next & DD_PHASE1) && (next & DD_PHASE3)) ||
((next & DD_PHASE2) && (next & DD_PHASE4))
) {
step = 0;
}