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Made some progress with DEC's "TRAP TEST", but looks like it still needs some work

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This commit is contained in:
Jeff 2016-11-10 15:51:47 -08:00 • committed by Jeff Parsons
commit db63c30c1e
24 changed files with 1252 additions and 555 deletions
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11
modules/pdp11/lib/device.js
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@ -1048,7 +1048,16 @@ DevicePDP11.prototype.readPSW = function(addr)
*/
DevicePDP11.prototype.writePSW = function(data, addr)
{
var maskDisallowed = PDP11.PSW.UNUSED | PDP11.PSW.TF;
/*
* pdp11.js disallowed PSW.TF in addition to PSW.UNUSED, but DEC's "TRAP TEST" expects the
* following instruction to trap:
*
* 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.
*/
var maskDisallowed = PDP11.PSW.UNUSED;
this.cpu.setPSW((data & ~maskDisallowed) | (this.cpu.getPSW() & maskDisallowed));
this.cpu.opFlags |= PDP11.OPFLAG.NO_FLAGS;
};