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Cleaned up management of unused PSW bits

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This commit is contained in:
Jeff Parsons 2016-12-04 16:23:37 -08:00 • committed by Jeff Parsons
commit 1e1db7b78e
24 changed files with 574 additions and 530 deletions
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10
modules/pdp11/lib/device.js
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@ -1078,11 +1078,13 @@ DevicePDP11.prototype.writePSW = function(data, addr)
*
* 004174: 052767 000020 173574 BIS #20,177776
*
* Since that test was written for the PDP-11/20, it's possible that newer machines
* have a different behavior, but for now, we assume that all machines allow setting PSW.TF.
* Since that test was written for the PDP-11/20, it's possible that newer machines have a different
* behavior, but for now, we assume that all machines allow setting PSW.TF.
*
* Moreover, we have changed setPSW() to disallow the setting of any bits not supported by the current
* CPU model, so it seems rather pointless to do any masking of bits here.
*/
var maskDisallowed = PDP11.PSW.UNUSED;
this.cpu.setPSW((data & ~maskDisallowed) | (this.cpu.getPSW() & maskDisallowed));
this.cpu.setPSW(data);
};
/**