Data Sheet

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the CPU has weak pull-up resistors connected to 5V.
Combining this Tibbit with #21 is potentially limited in use because #00-1 doesn't have dedicated
ground or power lines, and Tibbit #21 doesn't have them, either. Need ground (and power)?
Consider replacing #21 with #20 (it has ground and power), or turn to using Tibbit #00-2 (it provides
ground) or #00-3 (it provides ground and power).
LEDs
Four yellow LEDs are connected to four control lines of the CPU (through buering gates). LEDs light
up for the LOW state of control lines.
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Tibbit Module