diff --git a/doc/notes.txt b/doc/notes.txt
index 10ff4113..893e85ba 100644
--- a/doc/notes.txt
+++ b/doc/notes.txt
@@ -154,6 +154,7 @@ TODO:
   - support projects with subdirectories, file list?
   - emulator needs reset shortcut for nes
   - switching platform of a repo?
+  - what to load if no main file?
 
 
 WEB WORKER FORMAT
diff --git a/index.html b/index.html
index 7e05fb87..5ab73cf5 100644
--- a/index.html
+++ b/index.html
@@ -359,6 +359,7 @@ if (window.location.host.endsWith('8bitworkshop.com')) {
         <p>Enter the GitHub repository URL:</p>
         <p><input id="importGithubURL" size="60" placeholder="https://github.com/user/repo"></input></p>
         <p>If the project is compatible with 8bitworkshop, it should build automatically.</p>
+        <p>Otherwise, some work may be required -- make sure you've selected the correct platform.</p>
         <p>Source files must be in the root folder of the repository.</p>
         <p><button type="button" class="btn btn-primary" id="importGithubButton">Import Project</button></p>
       </div>
diff --git a/src/project.ts b/src/project.ts
index dd208baa..b8ae7fa4 100644
--- a/src/project.ts
+++ b/src/project.ts
@@ -98,8 +98,8 @@ export class CodeProject {
       while (m = re2.exec(text)) {
         this.pushAllFiles(files, m[2]);
       }
-      // for .c -- //#link "file" (or ;link or #link)
-      let re3 = /^\s*([;#]|[/][/][#])resource\s+"(.+?)"/gm;
+      // for .c -- //#resource "file" (or ;resource or #resource)
+      let re3 = /^\s*([;]|[/][/])#resource\s+"(.+?)"/gm;
       while (m = re3.exec(text)) {
         this.pushAllFiles(files, m[2]);
       }
@@ -114,7 +114,7 @@ export class CodeProject {
       //
     } else {
       // for .c -- //#link "file" (or ;link or #link)
-      let re = /^\s*([;#]|[/][/][#])link\s+"(.+?)"/gm;
+      let re = /^\s*([;]|[/][/])#link\s+"(.+?)"/gm;
       while (m = re.exec(text)) {
         this.pushAllFiles(files, m[2]);
       }
diff --git a/src/ui.ts b/src/ui.ts
index 8b7def59..c2c199f3 100644
--- a/src/ui.ts
+++ b/src/ui.ts
@@ -572,13 +572,11 @@ function pushChangesToGithub(message:string) {
       files.push({path:newpath, data:data});
     }
   }
-  // TODO: include built ROM file in bin/[mainfile].rom
-  /*
+  // include built ROM file in bin/[mainfile].rom
   if (current_output instanceof Uint8Array) {
     let binpath = "bin/"+getCurrentMainFilename()+".rom";
     files.push({path:binpath, data:current_output});
   }
-  */
   // push files
   setWaitDialog(true);
   return getGithubService().login().then( () => {
diff --git a/src/worker/workermain.ts b/src/worker/workermain.ts
index 24a77246..fcf79b49 100644
--- a/src/worker/workermain.ts
+++ b/src/worker/workermain.ts
@@ -197,11 +197,6 @@ var PLATFORM_PARAMS = {
       {name:'Cartridge RAM',start:0x6000,size:0x2000,type:'ram'},
     ],
   },
-  'nes-asm': {
-    cfgfile: 'nes.cfg',
-    define: '__NES__',
-    libargs: ['nes.lib'],
-  },
   'apple2': {
     define: '__APPLE2__',
     cfgfile: 'apple2-hgr.cfg',
@@ -776,6 +771,9 @@ function assembleDASM(step:BuildStep) {
     listings[path] = {lines:[]};
   }
   parseDASMListing(alst, listings, errors, unresolved);
+  if (errors.length) {
+    return {errors:errors};
+  }
   // read binary rom output and symbols
   var aout, asym;
   aout = FS.readFile(binpath);
@@ -914,6 +912,7 @@ function assembleCA65(step:BuildStep) {
     var FS = CA65['FS'];
     setupFS(FS, '65-'+getRootBasePlatform(step.platform));
     populateFiles(step, FS);
+    fixParamsWithDefines(step.path, step.params);
     execMain(step, CA65, ['-v', '-g', '-I', '/share/asminc', '-o', objpath, '-l', lstpath, step.path]);
     if (errors.length)
       return {errors:errors};
@@ -947,6 +946,10 @@ function linkLD65(step:BuildStep) {
     setupFS(FS, '65-'+getRootBasePlatform(step.platform));
     populateFiles(step, FS);
     populateExtraFiles(step, FS, params.extra_link_files);
+    // populate .cfg file, if it is a custom one
+    if (workfs[params.cfgfile]) {
+      populateEntry(FS, params.cfgfile, workfs[params.cfgfile], null);
+    }
     var libargs = params.libargs;
     var cfgfile = params.cfgfile;
     var args = ['--cfg-path', '/share/cfg',
@@ -1034,6 +1037,7 @@ function fixParamsWithDefines(path:string, params){
   if (path && libargs) {
     var code = getWorkFileAsString(path);
     if (code) {
+      var oldcfgfile = params.cfgfile;
       var ident2index = {};
       // find all lib args "IDENT=VALUE"
       for (var i=0; i<libargs.length; i++) {
@@ -1043,7 +1047,7 @@ function fixParamsWithDefines(path:string, params){
         }
       }
       // find #defines and replace them
-      var re = /^#define\s+(\w+)\s+(\S+)/gmi;
+      var re = /^[;]?#define\s+(\w+)\s+(\S+)/gmi; // TODO: empty string?
       var m;
       while (m = re.exec(code)) {
         var ident = m[1];
@@ -1055,8 +1059,13 @@ function fixParamsWithDefines(path:string, params){
           // TODO: MMC3 mapper switch
           if (ident == 'NES_MAPPER' && value == '4') {
             params.cfgfile = 'nesbanked.cfg';
-            console.log('Using config file', params.cfgfile);
+            console.log("using config file", params.cfgfile);
           }
+        } else if (ident == 'CFGFILE' && value) {
+          params.cfgfile = value;
+        } else if (ident == 'LIBARGS' && value) {
+          params.libargs = value.split(',').filter((s) => { return s!=''; });
+          console.log('Using libargs', params.libargs);
         }
       }
     }
diff --git a/test/cli/testworker.js b/test/cli/testworker.js
index 7548a9db..58d54e8b 100644
--- a/test/cli/testworker.js
+++ b/test/cli/testworker.js
@@ -110,7 +110,7 @@ describe('Worker', function() {
     compile('cc65', '#include "NOSUCH.file"\n', 'nes', done, 0, 0, 1, {ignoreErrorPath:true});
   });
   it('should assemble CA65', function(done) {
-    compile('ca65', '\t.segment "HEADER"\n\t.segment "STARTUP"\n\t.segment "CHARS"\n\t.segment "VECTORS"\n\tlda #0\n\tsta $1\n', 'nes-asm', done, 40976, 2);
+    compile('ca65', ';#define LIBARGS ,\n\t.segment "HEADER"\n\t.segment "STARTUP"\n\t.segment "CHARS"\n\t.segment "VECTORS"\n\t.segment "SAMPLES"\n\t.segment "CODE"\n\tlda #0\n\tsta $1\n', 'nes', done, 40976, 2);
   });
   /*
   it('should assemble Z80ASM', function(done) {