Monthly Archives: January 2011

Commodore Plus/4, C116, C16 (TED) Technical Documents

The Commodore Plus/4, the C16 and the C116 from 1984 were members of the 6502-based “TED” series, named after the 7360 TED (“Text Editing Device”) video controller. The TED systems were basically the low-cost cousins of the C64: The overall system architecture and the video chip are very similar to the C64′s, but they lack certain features like hardware sprites. On the other hand, there are some added features like extra colors and more control over the internal timing of the video chip.

In the Commodore archive at, there is a collection of GIF images that are scans of the some very interesting technical documents on the TED series, originally provided by Tibor Biczo and published by William Levak and Marko Mäkelä. I sorted the pages and converted them into searchable PDFs that are much nicer to look at:

“TED System Hardware Manual”

(PDF, 48 pages, 7.6 MB)

“TED 7360R0 Preliminary Data Sheet” (Apr 1983)

(PDF, 23 pages, 5.8 MB)

“TED Extra Pages”

(PDF, 5 pages, 1.4 MB)

The “Extra Pages” contain a map of the circuit board, a Plus/4 memory map in German, a TED register map, and a German version of section 4.5.2 of the TED System Hardware Manual.

“Service Manual Model Plus 4 Computer.pdf” (Oct 1984, PN-314001-04)

(PDF, 25 pages, 4.9 MB)

The service manual is also taken from

Final Cartridge III Undocumented Functions

The “Final Cartridge III” has been among the most popular Commodore 64 extensions, providing a floppy speeder, BASIC extensions, a machine language monior, a freezer and even a (rarely used) graphical desktop. The major advantage compared to other C64 cartridges is the consistent way in which the Final Cartridge III extends the C64 experience.

As it turns out, there are several undocumented instructions implemented in the Final Cartridge III.

Filtered Directory


The DOS”$” command passes all characters following the “$” to the disk drive, allowing the user to specify filters, like this:


This feature is not available for the “@” command in the monitor.

Fast Format


The 26 second fast format known from the “DESKTOP” GUI is also available from the command line. Note that this also works with the “@” command in the monitor. If the ID is omitted, this only overwrites BAM and directory, just like the “N” command.

Disk Rename


This commands renames the disk without erasing it. The ID can be up to 5 characters, so the default “2A” can be overwritten.

FC III ROM Banking


B, followed by a digit between 0 to 3, in the monitor enables the view of the ROMs of the Final Cartridge III. The specified ROM bank will be visible between $8000 and $BFFF. B without a parameter switches the ROM back off.

The following commands in the machine language monitor can be used to dump the complete ROM of an FC3 to disk:

B 0
T 8000 BFFF 8000
S "B0",08,8000,C000
B 1
T 8000 BFFF 8000
S "B1",08,8000,C000
B 2
T 8000 BFFF 8000
S "B2",08,8000,C000
B 3
T 8000 BFFF 8000
S "B3",08,8000,C000