diff --git a/sampleWorkspace/readme.md b/sampleWorkspace/readme.md
index 32d3646..04b68c9 100644
--- a/sampleWorkspace/readme.md
+++ b/sampleWorkspace/readme.md
@@ -7,7 +7,7 @@ The text of the markdown is considered the "program to debug" and certain keywor
 
 With the "Run/Debug" split button in the editor header you can easily "run" or "debug" a Markdown file without having to configure a debug configuration.
 "Running" a Markdown file has no visible effect. "Debugging" a Markdown file starts the debugger and stops on the first line.
-  
+
 ## Stacks
 
 If debugging stops on a line, the line becomes a stack in the CALL STACK with the individual words shown as frames.
@@ -39,6 +39,7 @@ If a Mock Debug session is active, breakpoints are "validated" according to thes
 
 * if a line is empty or starts with `+` we don't allow to set a breakpoint but move the breakpoint down
 * if a line starts with `-` we don't allow to set a breakpoint but move the breakpoint up
+* if a line starts with `!`, "hardware" breakpoints can be set on the line
 * a breakpoint on a line containing the word `lazy` is not immediately validated, but only after hitting it once.
 
 ## Data Breakpoints
@@ -89,4 +90,4 @@ log(more text in group)
 log(end)
 ````
 
-## The End
\ No newline at end of file
+## The End
diff --git a/src/mockDebug.ts b/src/mockDebug.ts
index b02f49e..6a63aab 100644
--- a/src/mockDebug.ts
+++ b/src/mockDebug.ts
@@ -218,6 +218,11 @@ export class MockDebugSession extends LoggingDebugSession {
 		response.body.supportsFunctionBreakpoints = true;
 		response.body.supportsDelayedStackTraceLoading = true;
 
+		response.body.breakpointModes = [
+			{ appliesTo: ['source', 'exception'], label: 'Software', mode: 'sw' },
+			{ appliesTo: ['source', 'exception'], label: 'Hardware', mode: 'hw' },
+		];
+
 		this.sendResponse(response);
 
 		// since this debug adapter can accept configuration requests like 'setBreakpoint' at any time,
@@ -277,19 +282,18 @@ export class MockDebugSession extends LoggingDebugSession {
 	protected async setBreakPointsRequest(response: DebugProtocol.SetBreakpointsResponse, args: DebugProtocol.SetBreakpointsArguments): Promise<void> {
 
 		const path = args.source.path as string;
-		const clientLines = args.lines || [];
 
 		// clear all breakpoints for this file
 		this._runtime.clearBreakpoints(path);
 
 		// set and verify breakpoint locations
-		const actualBreakpoints0 = clientLines.map(async l => {
-			const { verified, line, id } = await this._runtime.setBreakPoint(path, this.convertClientLineToDebugger(l));
+		const actualBreakpoints0 = (args.breakpoints || []).map(async ({ line: l, mode }): Promise<DebugProtocol.Breakpoint> => {
+			const { verified, line, id } = await this._runtime.setBreakPoint(path, this.convertClientLineToDebugger(l), mode);
 			const bp = new Breakpoint(verified, this.convertDebuggerLineToClient(line)) as DebugProtocol.Breakpoint;
 			bp.id = id;
 			return bp;
 		});
-		const actualBreakpoints = await Promise.all<DebugProtocol.Breakpoint>(actualBreakpoints0);
+		const actualBreakpoints = await Promise.all(actualBreakpoints0);
 
 		// send back the actual breakpoint positions
 		response.body = {
diff --git a/src/mockRuntime.ts b/src/mockRuntime.ts
index 87858a6..898923b 100644
--- a/src/mockRuntime.ts
+++ b/src/mockRuntime.ts
@@ -14,6 +14,7 @@ export interface IRuntimeBreakpoint {
 	id: number;
 	line: number;
 	verified: boolean;
+	mode: string; // hw or sw
 }
 
 interface IRuntimeStepInTargets {
@@ -334,10 +335,10 @@ export class MockRuntime extends EventEmitter {
 	/*
 	 * Set breakpoint in file with given line.
 	 */
-	public async setBreakPoint(path: string, line: number): Promise<IRuntimeBreakpoint> {
+	public async setBreakPoint(path: string, line: number, mode = 'sw'): Promise<IRuntimeBreakpoint> {
 		path = this.normalizePathAndCasing(path);
 
-		const bp: IRuntimeBreakpoint = { verified: false, line, id: this.breakpointId++ };
+		const bp: IRuntimeBreakpoint = { verified: false, line, id: this.breakpointId++, mode };
 		let bps = this.breakPoints.get(path);
 		if (!bps) {
 			bps = new Array<IRuntimeBreakpoint>();
@@ -654,13 +655,16 @@ export class MockRuntime extends EventEmitter {
 						bp.line++;
 					}
 					// if a line starts with '-' we don't allow to set a breakpoint but move the breakpoint up
-					if (srcLine.indexOf('-') === 0) {
+					if (srcLine.startsWith('-')) {
 						bp.line--;
 					}
 					// don't set 'verified' to true if the line contains the word 'lazy'
 					// in this case the breakpoint will be verified 'lazy' after hitting it once.
 					if (srcLine.indexOf('lazy') < 0) {
-						bp.verified = true;
+						// if a line starts with '!' we allow setting hardware breakpoints there
+						if (srcLine.startsWith('!') || bp.mode !== 'hw') {
+							bp.verified = true;
+						}
 						this.sendEvent('breakpointValidated', bp);
 					}
 				}