How many pieces does 9785 have?

It has 221 pieces, of which 67 are different variants. No minifigures are included.

How does it differ from 9786?

Set 9785 includes a serial cable, whereas 9786 comes with a USB cable. The piece count also differs slightly.

What was the set intended for?

It was made for schools and technology lessons around the programmable RCX brick. Today collectors look for it as well.

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Robo Technology Set (Serial Cable)

Set 9785 Robo Technology Set (Serial Cable)

Educational and Dacta RCX

LEGO® Robo Technology Set (Serial Cable)

The Robo Technology Set 9785 dates from 2003 and contains 221 pieces. It is part of the educational range for the programmable RCX brick and was supplied with a serial cable.

Set number: 9785
Year: 2003
Pieces: 221
Minifigures: 0
Theme: RCX
Different parts: 68

What can I build with it?

Parts list 68

As BrickLink list (XML)

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Description

Serial port rather than USB

The key difference from its sibling 9786 is the connection. This box includes a serial cable, which suited the older computers that many schools still used in 2003, whereas the USB set targeted newer machines. If you are hunting for a particular version, the number is what counts. The building parts are almost the same, and the piece count of 221 sits just one below the USB edition. A single piece is all that separates the two boxes.

Made for lessons

The set comes from the Educational and Dacta range and was designed with classrooms in mind. At 221 pieces it stays manageable enough for a group to reach a first working model within a single lesson. You build chassis, gearboxes and simple grabbers that can be programmed later. There are no minifigures because the focus is on engineering: how gears transmit force, and how levers and axles work together. The set supplies the raw material, and curiosity does the rest.

Colours and variety

Light grey and black make up most of the set, with blue and yellow as accents. Of the 221 pieces, 67 are unique, slightly more than in the USB version. Plenty of parts therefore repeat, which is handy when you are building gearboxes and frames. The parts list on this page shows every variant with its quantity, so you can quickly spot which pieces are missing from your own technical projects before you buy anything extra.

A collector's piece today

If you enjoy early programmable bricks, this set offers a small slice of technology history. Collectors will want to compare it with 9786, because the two boxes differ in the details. Add it to your collection and use the “What can I build?” tool to see which further models your current parts allow. That turns a teaching kit into a useful source of parts for new creations. Even without the matching computer, it works well as a plain box of technical pieces.

FAQ

How many pieces does 9785 have?: It has 221 pieces, of which 67 are different variants. No minifigures are included.
How does it differ from 9786?: Set 9785 includes a serial cable, whereas 9786 comes with a USB cable. The piece count also differs slightly.
What was the set intended for?: It was made for schools and technology lessons around the programmable RCX brick. Today collectors look for it as well.

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