diff --git a/packages/cosmic-swingset/lib/ag-solo/html/index.html b/packages/cosmic-swingset/lib/ag-solo/html/index.html
index 2a7823a3493..a49fab4edf1 100644
--- a/packages/cosmic-swingset/lib/ag-solo/html/index.html
+++ b/packages/cosmic-swingset/lib/ag-solo/html/index.html
@@ -114,12 +114,17 @@
       padding-bottom: 12px;
     }
 
-    .history>div> :first-child {
+    .history>.msg-line {
+      background: antiquewhite;
+      font-style: oblique;
+    }
+
+    .history>div>.command-line :first-child, .history>div>.history-line :first-child {
       text-align: right;
       color: #424248;
     }
 
-    .history>div> :nth-child(2) {
+    .history>div>.command-line :nth-child(2), .history>div>.history-line :nth-child(2) {
       text-align: left;
       padding-left: 8px;
       /* Overflow must be set (to auto or hidden) to force the word break to apply.
diff --git a/packages/cosmic-swingset/lib/ag-solo/html/main.js b/packages/cosmic-swingset/lib/ag-solo/html/main.js
index f7057ec30ad..f80128c9b45 100644
--- a/packages/cosmic-swingset/lib/ag-solo/html/main.js
+++ b/packages/cosmic-swingset/lib/ag-solo/html/main.js
@@ -44,27 +44,53 @@ function run() {
 
   const commands = [];
 
-  function addHistoryRow(h, histnum, kind, value) {
+  function linesToHTML(lines) {
+    return lines
+      .split('\n')
+      .map(l =>
+        l
+          .replace('&', '&')
+          .replace('<', '&lt;')
+          .replace(/\t/g, '  ')
+          .replace(/\s/g, '&nbsp;'),
+      )
+      .join('<br />');
+  }
+
+  function addHistoryRow(h, histnum, kind, value, msgs) {
+    if (histnum >= 0) {
+      const row = document.createElement('div');
+      row.className = `${kind}-line`;
+      const label = document.createElement('div');
+      label.textContent = `${kind}[${histnum}]`;
+      const content = document.createElement('div');
+      content.id = `${kind}-${histnum}`;
+      content.textContent = `${value}`;
+      row.appendChild(label);
+      row.appendChild(content);
+      h.append(row);
+    }
+    // Write out any messages attached to this line.
     const row = document.createElement('div');
-    row.className = `${kind}-line`;
-    const label = document.createElement('div');
-    label.textContent = `${kind}[${histnum}]`;
-    const content = document.createElement('div');
-    content.id = `${kind}-${histnum}`;
-    content.textContent = `${value}`;
-    row.appendChild(label);
-    row.appendChild(content);
+    row.className = 'msg-line';
+    const m = document.createElement('div');
+    m.id = `msg-${kind}-${histnum}`;
+    if (msgs) {
+      m.innerHTML = linesToHTML(`${msgs}`);
+    }
+    row.appendChild(document.createElement('div'));
+    row.appendChild(m);
     h.append(row);
   }
 
-  function addHistoryEntry(histnum, command, result) {
+  function addHistoryEntry(histnum, command, result, consoles) {
     const h = document.getElementById('history');
-    addHistoryRow(h, histnum, 'command', command);
-    addHistoryRow(h, histnum, 'history', result);
+    addHistoryRow(h, histnum, 'command', command, consoles.command || '');
+    addHistoryRow(h, histnum, 'history', result, consoles.display || '');
     commands[histnum] = command;
   }
 
-  function updateHistory(histnum, command, result) {
+  function updateHistory(histnum, command, result, consoles = {}) {
     const h = document.getElementById('history');
     const isScrolledToBottom =
       h.scrollHeight - h.clientHeight <= h.scrollTop + 1;
@@ -74,10 +100,14 @@ function run() {
     const c = document.getElementById(`command-${histnum}`);
     if (c) {
       const h1 = document.getElementById(`history-${histnum}`);
+      const m1 = document.getElementById(`msg-command-${histnum}`);
+      const m2 = document.getElementById(`msg-history-${histnum}`);
       c.textContent = `${command}`;
+      m1.innerHTML = linesToHTML(`${consoles.command}`);
       h1.textContent = `${result}`;
+      m2.innerHTML = linesToHTML(`${consoles.display}`);
     } else {
-      addHistoryEntry(histnum, command, result);
+      addHistoryEntry(histnum, command, result, consoles);
     }
     if (isScrolledToBottom) {
       setTimeout(() => (h.scrollTop = h.scrollHeight), 0);
@@ -97,7 +127,7 @@ function run() {
     // we receive commands to update result boxes
     if (obj.type === 'updateHistory') {
       // these args come from calls to vat-http.js updateHistorySlot()
-      updateHistory(obj.histnum, obj.command, obj.display);
+      updateHistory(obj.histnum, obj.command, obj.display, obj.consoles);
     } else {
       console.log(`unknown WS type in:`, obj);
     }
diff --git a/packages/cosmic-swingset/lib/ag-solo/vats/repl.js b/packages/cosmic-swingset/lib/ag-solo/vats/repl.js
index a839f158676..408600ad3b3 100644
--- a/packages/cosmic-swingset/lib/ag-solo/vats/repl.js
+++ b/packages/cosmic-swingset/lib/ag-solo/vats/repl.js
@@ -1,6 +1,7 @@
 import { makeEvaluators } from '@agoric/evaluate';
 import harden from '@agoric/harden';
 import { isPromise } from '@agoric/produce-promise';
+import { makeConsole } from '@agoric/swingset-vat/src/makeConsole';
 
 // A REPL-specific JSON stringify.
 export function stringify(
@@ -30,6 +31,8 @@ export function stringify(
   already.add(value);
 
   let ret = '';
+  const spcs = spaces === undefined ? '' : `\n${' '.repeat(spaces)}`;
+  const nextSpaces = spaces === undefined ? undefined : spaces + 2;
   if (getInterfaceOf && getInterfaceOf(value) !== undefined) {
     ret += `${value}`;
   } else if (Array.isArray(value)) {
@@ -37,9 +40,17 @@ export function stringify(
 
     let sep = '';
     for (let i = 0; i < value.length; i += 1) {
-      ret += sep + stringify(value[i], spaces, getInterfaceOf, already);
+      ret += `${sep}${spcs}${stringify(
+        value[i],
+        nextSpaces,
+        getInterfaceOf,
+        already,
+      )}`;
       sep = ',';
     }
+    if (sep !== '') {
+      ret += spcs;
+    }
     ret += ']';
     return ret;
   }
@@ -47,38 +58,86 @@ export function stringify(
   ret += '{';
   let sep = '';
   for (const key of Object.keys(value)) {
-    ret += `${sep}${JSON.stringify(key, undefined, spaces)}:${stringify(
-      value[key],
-      spaces,
-      getInterfaceOf,
-      already,
-    )}`;
+    ret += `${sep}${spcs}${JSON.stringify(
+      key,
+      undefined,
+      nextSpaces,
+    )}:${stringify(value[key], nextSpaces, getInterfaceOf, already)}`;
     sep = ',';
   }
+  if (sep !== '') {
+    ret += spcs;
+  }
   ret += '}';
   return ret;
 }
 
 export function getReplHandler(E, homeObjects, send, vatPowers) {
-  const commands = {};
-  const history = {};
-  const display = {};
   let highestHistory = -1;
+  const commands = {
+    [highestHistory]: '',
+  };
+  const history = {
+    [highestHistory]: '',
+  };
+  const display = {
+    [highestHistory]: '',
+  };
   const replHandles = new Set();
+  let consoleOffset = highestHistory * 2 + 1;
+  const consoleRegions = {
+    [consoleOffset - 1]: [],
+    [consoleOffset]: [],
+  };
+
+  // Create a message much like a console.log would.
+  function joinMsg(args) {
+    let ret = '';
+    let sep = '';
+    for (const a of args) {
+      let s;
+      if (typeof a === 'string') {
+        s = a;
+      } else {
+        s = stringify(a, 2, vatPowers.getInterfaceOf);
+      }
+      ret += `${sep}${s}`;
+      sep = ' ';
+    }
+    return ret;
+  }
 
   function updateHistorySlot(histnum) {
-    // console.debug(`sendBroadcast ${histnum}`);
+    console.warn(`sendBroadcast ${histnum}`, histnum, consoleOffset);
     send(
       {
         type: 'updateHistory',
         histnum,
         command: commands[histnum],
         display: display[histnum],
+        consoles: {
+          command: consoleRegions[histnum * 2].join('\n'),
+          display: consoleRegions[histnum * 2 + 1].join('\n'),
+        },
       },
       [...replHandles.keys()],
     );
   }
 
+  function writeToConsole(...args) {
+    consoleRegions[consoleOffset].push(joinMsg(args));
+    updateHistorySlot(Math.floor(consoleOffset / 2));
+  }
+
+  const replConsole = makeConsole({
+    debug: writeToConsole,
+    log: writeToConsole,
+    info: writeToConsole,
+    warn: writeToConsole,
+    error: writeToConsole,
+  });
+
+  replConsole.log(`Welcome to Agoric!`);
   const { evaluateProgram } = makeEvaluators({ sloppyGlobals: true });
 
   const handler = {
@@ -88,7 +147,7 @@ export function getReplHandler(E, homeObjects, send, vatPowers) {
 
     rebroadcastHistory() {
       // console.debug(`rebroadcastHistory`, highestHistory);
-      for (let histnum = 0; histnum <= highestHistory; histnum += 1) {
+      for (let histnum = -1; histnum <= highestHistory; histnum += 1) {
         updateHistorySlot(histnum);
       }
       return true;
@@ -102,18 +161,23 @@ export function getReplHandler(E, homeObjects, send, vatPowers) {
           `histnum ${histnum} is not larger than highestHistory ${highestHistory}`,
         );
       }
+
       highestHistory = histnum;
 
       commands[histnum] = body;
 
       // Need this concatenation to bypass direct eval test in realms-shim.
       // eslint-disable-next-line no-useless-concat
+      consoleOffset = histnum * 2;
+      consoleRegions[consoleOffset] = [];
+      consoleRegions[consoleOffset + 1] = [];
+      // eslint-disable-next-line no-useless-concat
       display[histnum] = `working on eval` + `(${body})`;
       updateHistorySlot(histnum);
 
       const endowments = {
         ...vatPowers,
-        console,
+        console: replConsole,
         E,
         commands,
         history,
@@ -128,7 +192,10 @@ export function getReplHandler(E, homeObjects, send, vatPowers) {
       } catch (e) {
         console.log(`error in eval`, e);
         history[histnum] = e;
-        display[histnum] = `exception: ${e}`;
+        display[histnum] = joinMsg('exception:', e);
+      } finally {
+        // Advance to the region after the display.
+        consoleOffset += 1;
       }
 
       if (isPromise(r)) {