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9709 Mindstorms RCX Programmable LEGO Brick thumbnail image

9709 Mindstorms RCX Programmable LEGO Brick
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9709 Mindstorms RCX Programmable LEGO Brick
  • RCX Programmable LEGO Brick thumbnail
  • RCX Programmable LEGO Brick thumbnail
  • RCX Programmable LEGO Brick thumbnail
  • RCX Programmable LEGO Brick thumbnail

LEGO 9709 RCX Programmable LEGO Brick is a Mindstorms set from 1999 valued at $120 for new and sealed sets, up 9% from an original retail price of $109.99. Annual appreciation has averaged 0.33% since release. On the used market, values range from $10 to $15 based on condition.

Set Value (New/Sealed)

This represents the current new/sealed value of the set RCX Programmable LEGO Brick since January 1999. Medium accuracy
LEGO 9709 RCX Programmable LEGO Brick is a Mindstorms set released in 1999, containing 1 piece. The product centers on the RCX programmable brick used with sensors, motors, and 9V Technic elements for building and programming robotic models, and it served as the controller for first-generation Mindstorms Robotics Invention System builds. The RCX provides 3 analog/digital inputs for sensors and 3 variable outputs, and it can be powered by six AA 1.5V batteries or an optional transformer (Ref. 9833). Its microcomputer uses a Hitachi architecture with 16K ROM, 512 bytes SRAM, and an additional 32K SRAM. Based on current trends, this set could be valued near $120 within the next year.
RCX Programmable LEGO Brick (9709-1) is a very old and rare LEGO set. It has not been available online or in retail stores in good/new condition for over 2 years. Because of its scarcity, the current estimated value of in new condition of $120.10 may be much lower than its true market value. Released in 1999, sealed sets in good condition are especially difficult to find, often commanding a premium well above estimates.

For Sale (New/Sealed)

There are currently no new/sealed listings available for 9709 RCX Programmable LEGO Brick at this time.
All regions

For Sale (Used)

 (US) Used - untested, clean contacts $10.00
(US) Used - eBay listing for 9709 RCX Programmable LEGO Brick $11.98
(CA) Used - inspected. tested $13.52

Sets in Mindstorms / 1

9747 Robotics Invention System

Theme / Subtheme Mindstorms / 1
Year 1999
Pieces 726
Availability Retired
9747 LEGO Mindstorms Robotics Invention System
Retail $199.99
Value $205.24
Growth  +2.6%

9735 Robotics Discovery Set

Theme / Subtheme Mindstorms / 1
Year 1999
Pieces 390
Availability Retired
9735 LEGO Mindstorms Robotics Discovery Set
Retail $149.99
Value $172.00
Growth  +14.7%
Annual growth 2.0%

3803 Robotics Invention System Upgrade Kit

Theme / Subtheme Mindstorms / 1
Year 1999
Pieces 70
Availability Retired
3803 LEGO Mindstorms Robotics Invention System Upgrade Kit
Retail $24.99
Value $43.38
Growth  +73.6%
Annual growth 2.1%

9757 Touch Sensor

Theme / Subtheme Mindstorms / 1
Year 1999
Pieces 2
Availability Retired
9757 LEGO Mindstorms Touch Sensor
Retail $10.99
Value $15.31
Growth  +39.3%
Annual growth 1.2%

9738 RCX Remote Control Unit

Theme / Subtheme Mindstorms / 1
Year 1999
Pieces 1
Availability Retired
9738 LEGO Mindstorms RCX Remote Control Unit
Retail $19.75
Value $20.92
Growth  +5.9%

9755 Temperature Sensor

Theme / Subtheme Mindstorms / 1
Year 1999
Pieces 1
Availability Retired
9755 LEGO Mindstorms Temperature Sensor
Retail $23.99
Value $27.03
Growth  +12.7%

9756 Rotation Sensor

Theme / Subtheme Mindstorms / 1
Year 1999
Pieces 1
Availability Retired
9756 LEGO Mindstorms Rotation Sensor
Retail $14.99
Value $16.59
Growth  +10.7%

9758 Light Sensor

Theme / Subtheme Mindstorms / 1
Year 1999
Pieces 1
Availability Retired
9758 LEGO Mindstorms Light Sensor
Retail $19.75
Value $21.35
Growth  +8.1%
Annual growth 8.1%

My Collection

RCX Programmable LEGO Brick Reviews

19 reviews
4.7
Collectors
Investors
Instructables
“The main problem with Mindstorms RCX is the lack of support from Lego for these old sets. According to what I have read and some experience, the sets only really work well under Windows 98. People found ways to make them work under heavily patched copies of Windows XP, but... More since Microsoft no longer supports XP and the patches from Lego aren't available anymore, I had to find an alternative to the Lego software.”
Full review at www.instructables.com

About Mindstorms 1

This is the first generation of LEGO Mindstorms, built around 9719 Robotics Invention System from 1998. The name came from Mindstorms, a 1980 book by Seymour Papert of the MIT Media Lab, whose research on programmable bricks led to the RCX, the yellow brick at the centre of the kit. It holds a small computer with three motor outputs and three sensor inputs, and programs written on a PC went to it by infrared through a tower plugged into the computer.

1 consists of 20 sets that ran from 1998 to 2004. As of today, 9747 Robotics Invention System is the most valuable 1 set with an estimated new/factory sealed value of $205.
Read more
The RCX is a programmable microcomputer that is used as the "brain" in robotics systems. It can control motors and take measurements with different sensors while a program made in a PC is executed.

Contains 3 analog/digital inputs suitable for sensors, and 3 variable outputs.
9V powered, with 6 AA 1,5V batteries, or using a transformer (Ref. 9833) not included.
Able to storage up to 5 different programs of up to 1500 instructions.
Microcomputer: HITACHI 16K ROM, 512 Bytes SRAM + 32 K SRAM.
It also includes an small speaker capable to reproduce tones, and a cronometer,
It is possible to communicate one RCX with another RCX.
Description provided by LEGO©