Name:           Cable Brains 
Version:        1.2
Developer:      RAK-WARE
Release Date:   1983
Load Address:   $A000 - 40960
Type:           Printer utility cartridge

Cartridge does appear to contain data/application.  Unsure if completely intact.
It appears to be a graphics cartridge for SEIKOSHA or OKIDATA brand printer.
"full Graphic Emulation Driver. With this package you can print all of the Graphic Characters
thar you computer has plus EMULATE the COmmodore printer."

There is text that is readable, there is a program included that will display the text.  
See instructions below.

The included cablebrains.prg can be loaded using an 8k memory expanision card.
See instructions below.

As far as I can tell the program is probably activated by one of the following:
    1. A sequence of keys being pressed.
    2. The presence of a printer being connected
    3. A combination of 1 and 2.

Files included:
notes.txt - you are reading it.
cablebrains.asm - one attempt at disassembling the code
cablebrains.tas - another attempt at disassembling the code
VIC-1210-1110-1111 Memory.pdf - Instructions on how to set 8k ram cartridge to $A000

cbprint.prg - displays some of the text on the cartridge.
usage:
Insert cartridge
turn on vic 20
load"cbprint.prg",8
type run to display text.

cablebrains.prg - can be used to load into an emulator or a vic 20 with an 8k ram 
cartridge set at address $A000
usage:
Insert 8k ram set for $A000 see instructions included on how to set this on commodore brand 8k ram cart.
Turn on vic
load "cablebrains.prg",8,1
sys64802 - this will run the auto start routine to load program.  If you don't it will be in a bad state.
you can now load and run cbprint.prg to verify it's loaded.