The DCT-6028 is a single tuner HD-DVR. It is capable of recording a single channel at a time. You must be watching the channel you are recording or watching a prerecorded program.

The DCT-6412 is a dual-tuner HD-DVR. It has 2 built in tuners and is capable of recording 2 channels, or record 1 channel while viewing another at the same time.

Unfortunately, no. The DVR box needs a cable signal from Comcast. This is done to prevent piracy/theft. More information can be found here.
There might be a hack out there for this, but I can't guaranty that it would work and if it would mess your box up.

DCT-6412 Feature List

User Guide »broadband.motorola.com/noflash/c···01-a.pdf

TWO HDTV TUNERS for increased watch and record options
Larger hard drive than single tuner version allowing for more storage
HDTV and DVR functionality in one unit
Full feature access from front panel
Digital diagnostics
Front and rear panel L/R audio and video inputs
Two USB connectors (one on front panel)1>
Pause, rewind and replay live HD broadcasts
Robust CPU, memory footprint, 3D graphics to run IPG, VOD, advanced applications and middleware
Full range of interfaces including YpbPr, DVI, 1394, USB, Ethernet, SPDIF, Smartcard1>, and more
YpbPr component output
Integrated High Definition decoder with YpbPr component output
DVI and dual 1394 (DTV) digital connectors
Built-in dual MPEG analog encoder
Optical and electrical SPDIF / Dolby Digital connectors
S-Video Output
Baseband output (Video, L/R Audio) ports
4 digit, 7 segment LED display with IR receiver for remote or/and keyboard
Switched Accessory Outlet
DVI and 1394 (DTV) digital interfaces

Common features of the DCT-6208

User guide: »broadband.motorola.com/dvr/downl···uide.pdf

HDTV and DVR functionality in one unit
Full Feature Access From Front Panel
Digital Diagnostics
Front and rear panel L/R audio and video inputs
Three USB connectors (one on front panel)1
Pause, rewind and play live HD broadcasts
Robust CPU (800 MIPS), memory footprint, 3D graphics to run IPG, VOD, advanced applications and middleware
Full range of interfaces including YpbPr, DVI, 1394, USB, Ethernet, SPDIF, Smartcard, and more
Integrated High Definition decoder with YpbPr component output
DVI and dual 1394(DTV) digital connectors
Built-in MPEG analog encoder
Optical and electrical SPDIF / Dolby Digital connectors
S-Video Output
RF and Baseband Output (Video, L/R Audio) Ports
4 digit, 7 segment LED display with IR receiver for remote and/or keyboard
Switched Accessory Outlet
DVI and 1394 (DTV) digital interfaces

1) Press the "Cable" button at the top of the remote to put it into Cable Box control mode.
2) Press and hold the "Setup" button until the "Cable" button blinks twice.
3) Type in the code 994. The "Cable" button will blink twice
4) Press (do not hold) the "Setup" button
5) Type in the code 00173 (for 30 second skip).
6) Press whatever button you want to map the skip function to.

Thanks to GuruUno

The 30 second skip programming only works for iGuide equipped DVRs. Also note that 30 second skip only works on prerecorded or delayed (through use of the pause live programming feature) programming. You can not 30 second skip live programming since that FUTURE programming hasn't been received yet.

Code list

General Instruments Cable Box
Cable Converters --
----------------------------------------------------------------------
0476 077 A (Diamond)
207 Fast Forward
243 Parental Lock
046 Record
237 B
115 G
177 M
242 Reserved 1
240 Browse
111 H
173 N
211 Reserved 2
114 C
048 Help (*)
034 O
238 Reserved 3
236 Cancel
113 I
211 Out Channel
208 Reserved 4
110 D
044 Info
210 P/F
204 Reserved 5
174 Day Minus
109 J
172 Page Down
209 Reverse
178 Day Plus
179 K
176 Page Up
241 A / Theme
112 E
175 L
205 Pause
108 F
239 List
081 PPV

CABLE CONVERTER.
018 0...............0
014 1...............1
016 2...............2
012 3...............3
019 4...............4
015 5...............5
017 6...............6
013 7...............7
146 8...............8
142 9...............9
147 CHANNEL DOWN....Channel Down
140 CHANNEL UP......Channel Up
047 DOWN............Down
080 CLEAR...........Exit
079 SURROUND........Fav Ch
050 PROGRAM.........Guide
076 RECALL..........Last Channel
049 LEFT............Left
206 MENU............Menu
082 ENTER...........Music
141 MUTE............Mute
144 POWER...........Power(CATV)
045 RIGHT...........Right
078 SELECT..........Select
083 TV/VCR..........Switch A/B
051 UP..............Up
145 VOLUME DOWN.....Volume Down
143 VOLUME UP.......Volume Up

DVR
178 Play
205 Pause
209 Rewind
207 Fast Forward
174 Stop
046 Record
173 Skip
179 Replay
175 DVR
210 PPV
208 OND
083 A/B
177 Live (DVR)
236 Swap (dual tuner DVR)

Simply substitute the code for the feature you would like to map with the code in the instructions for 30 second skip.

1) Press the "Cable" button at the top of the remote to put it into Cable Box control mode.
2) Press and hold the "Setup" button until the "Cable" button blinks twice.
3) Type in the code 994. The "Cable" button will blink twice
4) Press (do not hold) the "Setup" button
5) Type in the code 00XXX (Where XXX is the code for the feature you want to map).
6) Press whatever button you want to map the skip function to.

Ethernet port isn'tactive on the Comcast DVRs but info from smileybri that the USB ports are active but has yet to find valid WinXP drivers.

There's a code that you can enter to delete *everything* even the information from the guide. So it will take 15-30 minutes to re-download like there was a power surge. To delete it, follow these steps:
With your remote
Press "replay" one time ( the arrow bending back )
Press "MY DVR" three times ( button next to replay)
Press "LIVE" one time ( button next to MY DVR)

Your box will shut down and do all sorts of junk. Let it sit a minute then turn it back on.
More information: »Clearing out your DVR

DVR's work by using a hard drive to store programming that it receives and features an on screen guide to operate it's features. For live programming, programming is received by the unit and written to the hard drive. Programming that you see is being read from the hard drive the moment it's stored. During live programming when you use the pause or other features, storage of programming continues for up to 30 mintues while it's the playback from the stored programming that is manupulated using the remote.

From your local Comcast cable provider: 1-800-COMCAST

Power off the box and within 2 seconds press the OK button.

Access the diagnostic screen by turning off the box and within 2 seconds pressing OK on the remote.

Choose selection d14 INTERACTIVE STATUS

Bring up the menu using the menu button.
Select setup
Select cable box setup
Select configuration

Latest firmware version 9.19. No reports (as yet) as to what bug fixes or improvements are included. See this ongoing thread »DCT-6412 Firmware 9.19 Downloaded

The I.P. Address is required for certain interactive services such as Video On Demand. If you are having trouble with these services, check to see if your box has pulled an IP by viewing the diagnostic screen d14. If it hasn't or you can't obtain video on demand services, contact Comcast technical support at 1-800-COMCAST

Firmware version 9.15 addresses many lockup issues and is currently being deployed. Some have reported that some lockup/delay issues persist.

Motorola Dual-Tuner DVR High-Definition Set-Top DCT6412

Supports HDTV, Dolby 5.11> and DVR services
DOCSIS 1.0 / 1.1 capable integrated cable modem for high speed interactivity*
Internal 120 GB hard drive
MPEG-2 digital video processor
PCM, AC-3, Dolby 5.1 Prologic Digital audio capability
ITU standard 64/256 QAM/FEC/enhanced adaptive equalizer
Three 54-860 MHz tuners (two video, one data)
Frequency agile 2.048 Mbps out-of-band data receiver
32 bit, 2-D / 3-D graphics
Analog/digital video scaling (Picture in Graphics)
16 MB Flash, 128 MB DRAM standard unified memory
Clear analog channel processor with BTSC decoder
DES-based encryption/DCII access control
Macrovision® copy protection
10/100 Base-T Ethernet Port (RJ45 Connector)
Smartcard interface connector (e-commerce)2
TVPASS™ renewable security connector
IR Blaster Port

Motorola Advanced HD Set Top DCT6208

Supports HDTV and Dolby 5.1 services1
Build in DOCSIS modem for high speed interactivity
DOCSIS 1.0/1.1 capable integrated cable modem1
DCT6208 80 GB storage capacity
MPEG-2 Digital Video Processor
PCM, AC-3, Dolby 5.1 Prologic Digital audio capability
800 MIPS, RISC-based microprocessor
32 bit, 2-D / 3-D graphics
Analog/digital video scaling (Picture in Graphics)
10/100 Base-T Ethernet Connector (RJ45 Connector)
Smart Card Interface Connector (E-Commerce)2
TVPASSTM renewable security connector2
IR Blaster Port1

The cost in an additional $10 per month. Note that the $10 is ONLY A SERVICE FEE and is in addition to any cable box rental fee although this is often missed by reps entering sales orders where you will only be charged the service fee (unless they catch it).

For example (prices may vary by market)

Digital A/O Package 6.95
DVR Service With HDTV 9.95

Total $16.90 for DVR rental plus DVR service.

Some posters have reported that they aren't charged for the A/O, this is simply a mistake by Comcast and if brought to their attention they will promptly correct it.

Yep, sure do. It's in PDF form. You can view it online at »www.midcocomm.com/editable_conte···/DVR.pdf
Note: You will need Adobe Reader to read that file.

iGuide is the next generation interactive user interface developed by TV Guide for use by system operators deploying Motorola digital cable boxes.

More information: »www.i-guide.tv/

Microsoft TV is a next generation interactive user guide developed by Microsoft for use by system operators deploying the Motorola digital cable boxes. Only select markets use the Microsoft TV guide platform. The majority use iGuide from TV Guide.

More info: »www.microsoft.com/tv/Assets/wmv/···race.wvx

Yes. Sourceforge has a FAQ on how to do this.

»replayguide.sourceforge.net/dct6412/

Thanks to mrweirdo for the find.

Yes. »replayguide.sourceforge.net/dct6···wire.zip

For install instructions see »replayguide.sourceforge.net/dct6···_DCT6412

Thanks to mrweirdo for the find.