diff --git a/docs/pcjs/README.md b/docs/pcjs/README.md
index 87444b348..685b2d1f7 100644
--- a/docs/pcjs/README.md
+++ b/docs/pcjs/README.md
@@ -158,7 +158,7 @@ Remember that PC and PC XT machines supported only 160Kb diskettes (on any versi
 320Kb diskettes (on PC-DOS 1.1 and higher), and 180Kb and 360Kb diskettes (on PC-DOS 2.0 and higher).
 
 The 1.2Mb diskette format was introduced with the PC AT, and 720Kb and 1.44Mb diskette formats were
-introduced with the 8Mhz PC AT and PS/2 models.  So, when using any of these larger formats, be sure you're
+supported later on 8Mhz PC AT and PS/2 models.  So, when using any of these larger formats, be sure you're
 also using a compatible machine configuration.
 
 Learn more about PCjs disk images [here](/disks/).
diff --git a/docs/pcjs/demos/pc-dbg.js b/docs/pcjs/demos/pc-dbg.js
index 2c4b5b257..520e68a7e 100644
--- a/docs/pcjs/demos/pc-dbg.js
+++ b/docs/pcjs/demos/pc-dbg.js
@@ -742,11 +742,11 @@ function Sl(a,b){a.Pc=null;var c=sa(ta()+"/api/v1/user?req=verify&user="+b),d=c[
 function Rl(a,b,c){if(c){var d={req:"store"};d.user=b;d.state=Hl(a,"1.15.7");d.data=c;b=sa(ta()+"/api/v1/user",!1,d);d=b[1];if(b[0]){if(d){var e=d.indexOf("\n");0<e&&(d=d.substr(0,e));d.indexOf("Error: ")||(d=d.substr(7))}d='{"code":'+b[0]+',"data":"'+d+'"}'}b=JSON.parse(d);b&&"ok"==b.code?a.Ha("Machine state saved to server"):c&&(c=b&&b.data||"unable to save machine state",c="error"==b.code?"Error: "+c:"Error "+b.code+": "+c,a.Ha(c),xa("user",""),a.Pc=null)}}
 function Mb(a){if(a.Oc&&!a.Vh){var b=!ua("Click OK to save the PCjs machine state.\n\nWARNING: If you CANCEL, all disk changes will be discarded.");Gl(a,b,!0);!b&&a.gm?window&&window.location.reload():(b||(a.Gi=!0),a.Oh(Ll),a.Gi=!1)}else a.reset(),a.T&&Ib(a.T)}function C(a,b,c){a=Ra(a.id);for(var d=0;d<a.length;d++){var e=a[d];if(c)c==e&&(c=null);else if(e.type==b)return e}return null}k.Qa=function(a,b){this.Y&&(b||D(this.Y,this.Y.rm))&&this.Y.message(a)};
 Fa(function(){for(var a=B(window.document,"pcjs-machine"),b=0;b<a.length;b++)for(var c=a[b],d=A(c),c=B(c,"pcjs","computer"),e=0;e<c.length;e++){var f=c[e],g=A(f),g=new Kl(g,d,!0);Ua(g,f);Nl(g,g.Oh)}});Ba.show.push(function(){for(var a=B(window.document,"pcjs","computer"),b=0;b<a.length;b++){var c=A(a[b]);(c=Ta("Computer",c.id))&&c.Ck&&!c.Mb&&c.Oh(-1)}});
-Ba.exit.push(function(){for(var a=B(window.document,"pcjs","computer"),b=0;b<a.length;b++){var c=A(a[b]);(c=Ta("Computer",c.id))&&c.Mb&&Gl(c,!(!c.Oc||c.Vh),!0)}});var Tl=0;function Ul(a,b,c,d,e,f){e("Loading "+a+"...");sa(a,!0,null,null,function(g,h,l){l?f(h,null):Vl(h,a,b,c,d,e,f)})}
+Ba.exit.push(function(){for(var a=B(window.document,"pcjs","computer"),b=0;b<a.length;b++){var c=A(a[b]);(c=Ta("Computer",c.id))&&c.Mb&&Gl(c,!(!c.Oc||c.Vh),!0)}});var Tl=0;function Ul(a,b,c,d,e,f){e("Loading "+a+"...");sa(a,!0,null,null,function(g,h,l){l?(h||(h="unable to load "+a+" ("+l+")"),f(h,null)):Vl(h,a,b,c,d,e,f)})}
 function Vl(a,b,c,d,e,f,g){function h(a,f){if(f)g(f,null);else{if(c){var h=b;h&&0>h.indexOf("/")&&(h=window.location.pathname+h);a=a.replace(/(<machine[^>]*\sid=)(['"]).*?\2/,"$1$2"+c+"$2"+(d?" state=$2"+d+"$2":"")+(h?" url=$2"+h+"$2":""))}h=null;if(0===a.indexOf("<"))try{window.ActiveXObject||"ActiveXObject"in window?(e||(a=a.replace(/<!DOCTYPE(.|[\r\n])*]>\s*/g,"")),h=new window.ActiveXObject("Microsoft.XMLDOM"),h.async=!1,h.loadXML(a)):h=(new window.DOMParser).parseFromString(a,"text/xml")}catch(t){h=
 null,a=t.message}else a="unrecognized XML: "+(255<a.length?a.substr(0,255)+"...":a);g(a,h)}}a?e?Wl(a,f,h):h(a,null):g("no data"+(b?" for file: "+b:""),null)}
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-function Xl(a,b,c,d){function e(a){if(void 0===l){var b=h&&B(h,"machine-warning");l=b&&b[0]||null}l&&(l.innerHTML=ha(a))}function f(a){e("Error: "+a);n&&g();n=!1}function g(){0==--Tl&&Ia(!0)}var h,l,n=!0;Tl++;try{if(h=window.document.getElementById(a)){c||(c="/versions/pcjs/1.15.7/components.xsl");var q=function(a,d){if(d){var l=function(a,l){if(l)if(l)if(e("Processing "+b+"..."),window.ActiveXObject||"ActiveXObject"in window){var n=d.transformNode(l);n?(h.outerHTML=n,g()):f("transformNodeToObject failed")}else window.document.implementation&&
+function Xl(a,b,c,d){function e(a){if(void 0===l){var b=h&&B(h,"machine-warning");l=b&&b[0]||h}l&&(l.innerHTML=ha(a))}function f(a){e("Error: "+a);n&&g();n=!1}function g(){0==--Tl&&Ia(!0)}var h,l,n=!0;Tl++;try{if(h=window.document.getElementById(a)){c||(c="/versions/pcjs/1.15.7/components.xsl");var q=function(a,d){if(d){var l=function(a,l){if(l)if(l)if(e("Processing "+b+"..."),window.ActiveXObject||"ActiveXObject"in window){var n=d.transformNode(l);n?(h.outerHTML=n,g()):f("transformNodeToObject failed")}else window.document.implementation&&
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diff --git a/docs/pcjs/demos/pc.js b/docs/pcjs/demos/pc.js
index 3774a932b..e8363a93b 100644
--- a/docs/pcjs/demos/pc.js
+++ b/docs/pcjs/demos/pc.js
@@ -628,11 +628,11 @@ function nk(a,b){a.wc=null;var c=s(ka()+"/api/v1/user?req=verify&user="+b),d=c[1
 function mk(a,b,c){if(c){var d={req:"store"};d.user=b;d.state=Zj(a,"1.15.7");d.data=c;b=s(ka()+"/api/v1/user",!1,d);d=b[1];if(b[0]){if(d){var e=d.indexOf("\n");0<e&&(d=d.substr(0,e));d.indexOf("Error: ")||(d=d.substr(7))}d='{"code":'+b[0]+',"data":"'+d+'"}'}b=JSON.parse(d);b&&"ok"==b.code?a.xa("Machine state saved to server"):c&&(c=b&&b.data||"unable to save machine state",c="error"==b.code?"Error: "+c:"Error "+b.code+": "+c,a.xa(c),oa("user",""),a.wc=null)}}
 function kb(a){if(a.vc&&!a.Rg){var b=!la("Click OK to save the PCjs machine state.\n\nWARNING: If you CANCEL, all disk changes will be discarded.");lk(a,b,!0);!b&&a.Tk?window&&window.location.reload():(b||(a.zh=!0),a.Kg(fk),a.zh=!1)}else a.reset(),a.ja&&ib(a.ja)}function D(a,b,c){a=Ea(a.id);for(var d=0;d<a.length;d++){var e=a[d];if(c)c==e&&(c=null);else if(e.type==b)return e}return null}
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-qa.exit.push(function(){for(var a=C(window.document,"pcjs","computer"),b=0;b<a.length;b++){var c=A(a[b]);(c=Ga("Computer",c.id))&&c.Ab&&lk(c,!(!c.vc||c.Rg),!0)}});var ok=0;function pk(a,b,c,d,e,f){e("Loading "+a+"...");s(a,!0,null,null,function(l,g,m){m?f(g,null):qk(g,a,b,c,d,e,f)})}
+qa.exit.push(function(){for(var a=C(window.document,"pcjs","computer"),b=0;b<a.length;b++){var c=A(a[b]);(c=Ga("Computer",c.id))&&c.Ab&&lk(c,!(!c.vc||c.Rg),!0)}});var ok=0;function pk(a,b,c,d,e,f){e("Loading "+a+"...");s(a,!0,null,null,function(l,g,m){m?(g||(g="unable to load "+a+" ("+m+")"),f(g,null)):qk(g,a,b,c,d,e,f)})}
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+function sk(a,b,c,d){function e(a){if(void 0===m){var b=g&&C(g,"machine-warning");m=b&&b[0]||g}m&&(m.innerHTML=fa(a))}function f(a){e("Error: "+a);n&&l();n=!1}function l(){0==--ok&&wa(!0)}var g,m,n=!0;ok++;try{if(g=window.document.getElementById(a)){c||(c="/versions/pcjs/1.15.7/components.xsl");var q=function(a,d){if(d){var m=function(a,m){if(m)if(m)if(e("Processing "+b+"..."),window.ActiveXObject||"ActiveXObject"in window){var n=d.transformNode(m);n?(g.outerHTML=n,l()):f("transformNodeToObject failed")}else window.document.implementation&&
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diff --git a/docs/pcjs/demos/samples.zip b/docs/pcjs/demos/samples.zip
index 32b3a85f9..f527710ae 100644
Binary files a/docs/pcjs/demos/samples.zip and b/docs/pcjs/demos/samples.zip differ
diff --git a/my_modules/shared/lib/embed.js b/my_modules/shared/lib/embed.js
index 612835330..a384eabda 100644
--- a/my_modules/shared/lib/embed.js
+++ b/my_modules/shared/lib/embed.js
@@ -91,6 +91,7 @@ function loadXML(sXMLFile, idMachine, sStateFile, fResolve, display, done)
 {
     var doneLoadXML = function(sURLName, sXML, nErrorCode) {
         if (nErrorCode) {
+            if (!sXML) sXML = "unable to load " + sXMLFile + " (" + nErrorCode + ")";
             done(sXML, null);
             return;
         }
@@ -311,7 +312,7 @@ function embedMachine(sName, sVersion, idElement, sXMLFile, sXSLFile, sStateFile
              * include and then generates the embedPC() and/or embedC1P() calls.
              */
             var aeWarning = (eMachine && Component.getElementsByClass(eMachine, "machine-warning"));
-            eWarning = (aeWarning && aeWarning[0]) || null;
+            eWarning = (aeWarning && aeWarning[0]) || eMachine;
         }
         if (eWarning) eWarning.innerHTML = str.escapeHTML(sMessage);
     };
diff --git a/versions/c1pjs/1.15.7/c1p-dbg.js b/versions/c1pjs/1.15.7/c1p-dbg.js
index 22bb7e121..34dfba3bd 100644
--- a/versions/c1pjs/1.15.7/c1p-dbg.js
+++ b/versions/c1pjs/1.15.7/c1p-dbg.js
@@ -159,11 +159,11 @@ a.i("note: frequency and history commands operate only when breakpoints are set"
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