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Ensure all 8-bit I/O restricts itself to 8 bits (fixes video glitches in Win95 Setup)

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This commit is contained in:
Jeff Parsons 2015-08-17 10:51:50 -07:00
commit e39550f835
5 changed files with 53 additions and 31 deletions
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4
modules/pcjs/lib/x86ops.js
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@ -3774,7 +3774,7 @@ X86.opOUTw = function OUTw()
* what about the SECOND byte? If the port is 0xff, will the SECOND byte of I/O use port 0x00 or 0x100?
* Our code (below) assumes the latter. Mask (port + 1) with 0xff if it turns out the former is true.
*/
this.bus.checkPortOutputNotify(port + 1, this.regEAX >> 8, this.regLIP - 2);
this.bus.checkPortOutputNotify(port + 1, (this.regEAX >> 8) & 0xff, this.regLIP - 2);
this.nStepCycles -= this.cycleCounts.nOpCyclesOutP;
};
@ -3887,7 +3887,7 @@ X86.opOUTDXw = function OUTDXw()
if (BACKTRACK) this.backTrack.btiIO = this.backTrack.btiAL;
this.bus.checkPortOutputNotify(port, this.regEAX & 0xff, this.regLIP - 1);
if (BACKTRACK) this.backTrack.btiIO = this.backTrack.btiAH;
this.bus.checkPortOutputNotify((port + 1) & 0xffff, this.regEAX >> 8, this.regLIP - 1);
this.bus.checkPortOutputNotify((port + 1) & 0xffff, (this.regEAX >> 8) & 0xff, this.regLIP - 1);
this.nStepCycles -= this.cycleCounts.nOpCyclesOutDX;
};