Commodore 64 Software Releases

Other Commodore 64 software releases, that do not require C64 OS, are added here as they become available.

Executable files have no file extension, and should be transferred to the C64 as PRG-type files.

Filename

Release Date

Platform

Version #

File Size

CRC32 checksum

filecopy

2023-11-04

Commodore 64

1.1

569 bytes, 3 blocks

0356ca30

Filecopy

Universal, 2-Drive, 1-File, File Copier

Copies one file between the current directory and partition of any two devices. Virtually all devices supported. Filecopy is designed to be as barebones and agnostic as possible. It asks for a source device number, a destination device number, a filename, and a target file type: PRG or SEQ. It then copies the file with that name between the two devices. Nothing more, nothing less.

Filename

Release Date

Platform

Version #

File Size

CRC32 checksum

monitorc

2023-07-20

Commodore 64

1.0

4098 bytes, 17 blocks

434d2334

MonitorC

Versatile Machine Language Monitor

A versatile machine language monitor, one of the most featureful available for the C64. The original author of this tool is unknown. This monitor is from a collection of native development tools for the Commodore 64 available on the public FTP server c64.rulez.org. MonitorC can disassemble code, examine memory contents, load and save blocks of binary data to and from disk, search memory, transfer memory and much more.

Loading Instructions

MonitorC loads to $C000.

With JiffyDOS or similar DOS wedge:

£monitorc

Without JiffyDOS:

load"monitorc",8,1
sys49152

Quick Command Reference

Command	Syntax	Usage Notes
Assemble	.a 2000 lda #$20	Assemble code at $2000. Auto-calculates branch offsets.
Breakpoint	.b 1000	Set a breakpoint at $1000. See: Quick Trace.
Compare	.c 1000 2000 c000	Print the locations of bytes from $1000 to $2000 that are unequal to corresponding memory at $c000.
Decimal Conversion	.#64738	Converts the decimal number 64738 to hexadecimal, $fce2.
Disassemble	.d 2000 3000	Disassemble memory from $2000 to $3000, second parameter is optional.
Edit Character	.ec 6000 7000	Display memory visualized in 8 bit rows for editing character data, second parameter is optional.
Edit Sprite	.es 6000 7000	Display memory visualized in 24 bit rows for editing sprite data, second parameter is optional.
Exit	.x	Exit the monitor back to BASIC.
Fill	.f 1000 2000 ff	Fill memory from $1000 to $2000 with $ff.
Go	.g 1000	Execute code at $1000. If parameter omitted, continues executing from PC.
Hexadecimal Conversion	.$ffd2=	Converts the hexdecimal number $ffd2 to decimal, 65490.
Hunt	.h 1000 2000 'term .h 1000 2000 a0 b0 c0	Search memory $1000 to $2000 for string "term". Search memory $1000 to $2000 for byte sequence $a0 $b0 $c0.
Load	.l "//:filename",0c	Load filename on device 12 (0c) to the load address of the PRG file.
Memory	.m 2000 3000	Display memory from $2000 to $3000, second parameter is optional.
Quick Trace	.q 1000	Traces code starting at $1000, or from PC if address is omitted. Stops on established breakpoints and disassembles. *
Registers	.r	Display the current PC, NMI, Accumulator, X and Y registers, stack pointer, and processor flags.
Save	.s "//:filename",0c,2000,3000	Save to filename on device 12 (0c) memory from $2000 to $2fff (end address -1)
Transfer	.t 1000 2000 3000	Memory from $1000 to $2000 is transfered to $3000.
Walk	.w 1000	Single step code from $1000, or from PC if address is omitted. Disassembles each instruction to be executed next. *

* Press STOP during a Quick Trace or Walk to stop executing and return to the monitor's prompt.

* Press "j" during a Quick Trace or Walk to leave the monitor by jumping to that point of the program and begin executing directly.

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Last modified: Dec 24, 2023

About this page

C64 OS version 1.04 is now available for order. New updated User's Guide, 46 pages with improved typography and layout and updated content for improved installation and set up experience.

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