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Commodore Plus/4 Series

28 May 2022

Master the MEGA65 Keyboard

by Steven B. Combs, Ph.D.
tags: mega65 - keyboard - productivity

I love a good keyboard shortcut and consider myself a Mac shortcut connoisseur. One of the fun features of the MEGA65 is the keyboard; both the hardware and the functionality. In this blog post and companion video, I cover the keyboard layout, functions, and shortcuts you need to master the MEGA65 keyboard. Time to learn how to be a keyboard NINJA on the MEGA65.

While you might think advanced keyboard combinations started with the MEGA65, many of them have their routes back to the original PET, refined as part of the Plus/4 and C128, and optimized by the MEGA65 team. There’s a fun keyboard history that I won’t cover, that you should not ignore. I’ve used a Commodore keyboard since the early 1980s and it was fun to revisit those keystrokes with my MEGA65 DevKit.

Table of Contents

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Companion YouTube Video

Title: Master the MEGA65 Keyboard | MEGA-sized retroCombs Edition

In the video below, I cover all aspects of the MEGA65 keyboard.

Video Errata

[UPDATE: 2022-05-28] I mention that the HELP function key doesn’t do anything and that’s not accurate. If you run into a syntax error when you run a BASIC program, press the HELP key and the BASIC 65 will display the first line of code with the error. The HELP command serves the same function.

[UPDATE: 2022-05-28] Carsten Lervad shares the following about the “bell ringing” routine:

Try typing “PRINT CHR$(7)” on an C128 or the MEGA65. I doubt it works on a C64. It is not the keyboard triggering the bell sound, but the Console Interpreter (or Editor in Commodore terminology) receiving and translating the CHR$(7) into the bell sound. In the same way, the Console/Editor doesn’t know whether the CHR$(13) comes from pressing Return or CTRL+M… or even from some other source, like say “force”-feeding keystrokes into the keyboard buffer.

[UPDATE: 2022-05-28] John Guillory shares:

The back arrow was sometimes used as an escape key to backup to the previous menu, being that the c64 didn’t have an escape key.

Below are the links I mention in this blog post and companion video. All Amazon links are affiliate links. I’d like to thank everyone for your support of the blog and the YouTube channel by starting your purchases here!

  1. MEGA65 Computer
  2. MEGA65 Book

INFO Command

Before we master the keyboard, here’s a tip. There’s a command users will find useful:

INFO This command presents the following results:
ROM-V   920333   PROGRAM:    0 / 55037
SPEED   40 MHZ   SCALARS:    8 /  1464
BANK4 --------   STRINGS:    0 / 54980
BANK5 --------   ARRAYS :    0 / 54980

This is handy when you need quick info on these settings.

Keyboard Layout

The layout of the keys on the MEGA65 keyboard is true to the layout found on the proposed Commodore 65 and therefore is a natural evolution of the keyboards around on the PET, VIC-20, C64, Plus/4, and C128. It includes popular keys in familiar locations found on these previous computers along with additional keys that functionality to both the MEGA65 hardware and software. Below is an image of the keyboard layout.

MEGA65 Keyboard Layout

The first thing you will notice, if you are new to Commodore computers, is the location for many common keys such as ( ) " ' @ * and others are not the same as a modern Mac or PC keyboards. These changes will throw off your muscle memory. But don’t despair, your fingers will get use to the arrangement and after a while, even swapping back and forth isn’t confusing. Your brain will adjust. If you were an original Commodore computer users, you’ll be surprised how familiar and nostalgic the MEGA65 keyboard feels.

The alpha-numeric keys are in the standard QWERTY layout; however, there are keys you won’t find on a modern keyboard.

Command Keys

There are several command keys on the MEGA65. Many of these will be familiar and others are new (or old). Users with Commodore computer experience will feel right at home and enjoy the new keys and features the MEGA65 brings to the retro-computing experience. We will start with the most basic of command keys, RETURN.


In the words of Jim Butterfield from his Commodore 64 Training Video, the RETURN tells the computer to “DO IT.” That can mean many things on the MEGA65 such as:

  1. Save a BASIC program line into memory.
  2. Activate an immediate mode command.
  3. Display incorrect syntax error messages.
  4. Accept program data input.
  5. Accept program default data.
  6. Produce a carriage return.

Software developers can program this key for other uses.


There are two SHIFT keys, one on the left and one on the right. These keystrokes are called Shifted Codes and, while similar to their modern counterparts, they have MEGA65 specific functions.

Holding the SHIFT key and tapping a key with two front graphics will produce the right graphic. When the MEGA65 is in lowercase mode, holding SHIFT and an alpha character displays the uppercase version. Holding SHIFT and a numeric/symbol key will produce the alternate character displayed on the key.

Holding SHIFT with a function key will activate the second function on the key. As an example, to use F2, hold SHIFT + F1.


The MEGA65 includes a SHIFT LOCK key with an embedded LED and locking switch. Press SHIFT LOCK when it is necessary to type many uppercase characters. While active, you no longer have to press the SHIFT key to activate shifted characters. This includes graphic characters.


This key is like the SHIFT LOCK and works with alpha keys to produce capital letters.

CAPS LOCK on the MEGA65 has a superpower. Press and hold the CAPS LOCK to force the processor to run at 40 MHz. This is handy when you need to speed up the operation of a BASIC program temporarily or speed load a program from a disk image.


The ALT key is a modifier key that software developers can use to add functionality to their software.

Press and hold ALT while booting the MEGA65 to enter the MEGA65 Configuration Utility as shown in the image below:

MEGA65 Configuration Utility

This key is not available in Commodore 64 mode.


The CTRL key is a modifier key. These keystrokes are called Control Codes. Holding the CTRL key and tapping a key in the table below will produce the result in the list:

CTRL Function
1 Color Black
2 Color White
3 Color Red
4 Color Cyan
5 Color Purple
6 Color Green
7 Color Blue
8 Color Yellow
A Switches the VIC-IV to color range 16-31
B Underline mode - ESC + O to disable
D Switches the VIC-IV to default color range 0-15
E Restores the cursor color to white
G Ring the bell
I Cursor right one tab stop
J Cursor to the next line or two with BASIC code line that is two lines
K Locks upper/lower case modes
L Enables upper/lower case modes
M Same function as RETURN
N Changes text case from uppercase to lowercase only - not a toggle
O Flashing Mode - ESC + O to disable
P Scroll BASIC code down one line
Q Cursor to next line
S No Scroll but does not resume scroll - any key to resume
T Same function as INST/DEL
U Move back one word
V Scroll BASIC code up one line
W Move forward one word
X Sets or clears a tab
Z Cursor left one tab stop
] Same function as →
[ Same as ESC
* Load the Matrix Mode Debugger

About MEGA65 Colors

While not related to becoming a keyboard ninja on the MEGA65, I’m going to take a quick sidebar and share the colors, and their index code, available on the MEGA65 in BASIC mode in the table below. The MEGA65 community named colors 16 through 31. I was happy they selected my choice for 31, Hot Tamales; one of my favorite candies.

0 Black
1 White
2 Red
3 Cyan
4 Purple
5 Green
6 Blue
7 Yellow
8 Orange
9 Brown
10 Pink
11 Dark Gray
12 Medium Gray
13 Light Green
14 Light Blue
15 Light Gray
16 Guru Meditation
17 Rambutan
18 Carrot
19 Lemon Tart
20 Pandan
21 Seasick Green
22 Soylent Green
23 Slimer Green
24 The Other Cyan
25 Sea Sky
26 Smurf Blue
27 Screen of Death
28 Plum Sauce
29 Sour Grape
30 Bubblegum
31 Hot Tamales

This was another the way the developers could engage the community and allow them to be a part of the development.

I’ve created a program to display all the colors on your MEGA65. The output of that program is below:

MEGA65 Colors

If you’d like the program that includes a fun sound effect as the MEGA65 displays the colors, download the disk image below:

Download the MEGA65 Colors BASIC program from the MEGA65 FileHost.

💾 On Disk: M65 COLORS

Next we will use the MEGA key to access the several of the extended color keys.


If the MEGA key shape is familiar, see the image below and it will all make sense.

Commodore to MEGA65 Logo

Now that we know where the symbol comes from, let’s find out how to use it.

The MEGA key is a modifier key. These keystrokes are called MEGA Codes. Holding the MEGA key and tapping a key with two front graphics or a single graphic symbol will produce the left graphic or single symbol.

Holding SHIFT and tapping the MEGA key switches between lower and uppercase character modes.

Holding the MEGA key and tapping a number switches the color to the second color range listed on the key, as shown in the table below:

1 Color Orange
2 Color Brown
3 Color Light Red
4 Color Dark Gray
5 Color Medium Gray
6 Color Light Green
7 Color Light Blue
8 Color Light Gray

Holding the MEGA key and tapping the TAB key activates the Matrix Mode Debugger.

TIP: While I don’t cover the functions available in the Matrix Mode Debugger, one handy tip is that this is a quick way to know which core is in use.

Holding the MEGA key while turning on or resetting the MEGA65 will boot to Commodore 64 mode.


Tap the RUN/STOP key to exit a running BASIC program. This key rarely works with assembly language code and software can disable the key.

SHIFT + RUN/STOP will load the first program found on a floppy disk or attached disk image.

Press and hold RUN/STOP while resetting the MEGA65 will enter the Machine Code Monitor.


Press and hold RUN/STOP and then tap RESTORE to restore the computer to a “clean state” without clearing the contents of memory. Programs can disable this feature and it rarely works with assembly language programs.

I use RESTORE frequently to access the Freezer. Press and hold the RESTORE key for about a second and release when the screen border flickers. The Freezer will display as shown in the image below.

The Freezer

Cursor Keys

On the bottom right-hand side of the keyboard, unlike the Commodore VIC-20 and C64, but like the Plus/4 and C128, there are four cursor keys. The cursor keys move the cursor in the direction they point; either ↑, ↓, ←, or →.

If your muscle memory is stuck on a two cursor configuration, you can use SHIFT + ↓ to move the cursor up and SHIFT + → to move the cursor left. Holding down these keys (including the SHIFT combinations) will move the cursor until you stop pressing them.

Arrow Keys

The MEGA65 keyboard includes two arrow keys; ↑ (next to RESTORE) and ← (next to 1. To distinguish them, I will use [↑] and [←].

Use [↑] to raise a number to a power. For instance, the immediate command: PRINT 2[↑]3 will display the number 8.

Use [←] as a shortcut to SAVE a program to a disk or disk image. Below is an example:

[←] "SUB TRACK SYS NOTE: A closing quotation is not a required.

Later I will show how to use these keys as part of Escape Codes.


Press INST/DEL to delete a character to the left of the cursor and move all remaining characters on the line to the left one position.

Press SHIFT + INST/DEL to move all characters to the right one position, leaving a blank space, as needed, or to insert another character.

Holding either key combination will continue to insert and delete until you stop pressing them.


Press CLR/HOME to place the cursor at the top left-hand position on the MEGA65 screen.

Press SHIFT + CLR/HOME to clear the entire screen and place the cursor at the top left-hand position on the MEGA65 screen.


When you LIST a program, press NO SCROLL to pause the listing. Press NO SCROLL again to resume the listing.

Function/HELP (F15/16) Keys

Software developers can program function keys; however, many have native functions, as shown in the table below. Hold SHIFT and press a function key to activate the secondary, or even number, function key.

F1 Toggle between 40 and 80 column mode.
F2 No Function
F3 List the Directory of a disk or disk image
F4 List the .PRG files on a disk or disk image
F5 Moves the cursor back one word
F6 Displays KEY6 on the screen
F7 Moves the cursor forward one word.
F8 Enters the machine language monitor. Press X to exit.
F9 Scroll BASIC code down one line
F10 Displays KEY10 on the screen
F11 Scroll BASIC code up one line
F12 Displays KEY12 on the screen
F13 Delete character in front of cursor
F14 Insert character in front of cursor
HELP/F15 Enters HELP command
HELP/F16 Enters HELP command

About the HELP key; if you run into a syntax error when you run a BASIC program, press the HELP key and the BASIC 65 will display the first line of code with the error.

ESC Codes

Tap ESC and then tap the character. Do not hold down ESC. These keystrokes are called Escape Sequences.

@ Erase to end of screen
4 Clears screen and switches to 40 column mode
8 Clears screen and switches to 80 column mode
A Auto insert
B Set bottom-right screen margin
C Cancel auto insert
D Delete line
E Non-flashing cursor
F Flashing cursor
G Enable CTRL + G bell
H Disable CTRL + G bell
I Insert line
J Move to start of line
K Move to end of line
L Enable scrolling
M Disable scrolling and loops cursor to top of screen
O Cancel insert, quote, rvs, ul & flash modes
P Erase to beginning of line
Q Erase to end of line
S Switches the VIC-IV to color range 16-31
T Set top-left screen margin
U Switches the VIC-IV to default color range 0-15
V Scroll up
W Scroll down
X Switch between 40/80 display modes
Y Set default tab stops to every 8 characters
Z Clear all tab stops
‌[↑] Save current cursor position
‌[←] Restore saved cursor position

Booting Cores

It’s inconvenient to enter the core screen every time you want to load a different core and the MEGA65 developers understood this and created a keyboard combination to boot directly to the core slot of your choice.

  1. Hold down NO SCROLL and the number key of the core slot to boot
  2. Power on your MEGA65.

That is more convenient!


This content was a blast to prepare and I hope readers and watchers learn as much from the content as I did putting it together. I’m prepared for the community to tell me that I’ve missed something or to make corrections. Use the comments below to share and if I get enough feedback, I’ll consider an addendum.

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