M2 "Wide" Tibbits
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M2 Tibbits are double-width modules occupying two "M" sockets on the standard tile. They are roughly 14 x 14 "squares" (one "square" is 2.54 x 2.54 mm).
With double the size comes the doubled internal space and I/O capacity. M2s have eight I/O lines. They are used for "grander things" that just wouldn't fit into the M1 form factor.
Like M1s, M2 devices can be short (M2S) or tall (M2T).
The color coding scheme is identical to that of M1 Tibbits:
M2 Tibbits can incorporate up to eight status LEDs.
M2 modules have 4 groups of 6 pins arranged into 2 rows:
Pins 12 and 24 are the GROUND and +5V power pins. Most Tibbit Modules consume (take) 5V power. There are also power supply Tibbits that generate 5V power from a variety of sources. Those output 5V through pin 12. As an example of power Tibbits see Tibbits #10 and #23.
Pins 1 and 13 are for the additional +15V and -15V voltages. These are optional and only needed by few Tibbits. A special power supply Tibbit #12 generates +/-15V from the main 5V power.
Pins 6, 7, 18 and 19 are unused and should be left unconnected.
Notice that each pin row has a "missing pin" in this middle. This separates a row into two groups of 6 pins.