Commodore Amiga A500 Technical Reference Manual page 27

Expansion Notes
1) The loading, buffering and layout requirements specified for the
A1000/A500 expansion connector must be strictly followed for
reliable operation. Unbuffered devices and bus line extension are
known problem areas.
2) Unbuffered daisy-chaining of multiple external expansion devices
is not supported.
3) The A500 provides only nominal amounts of power for expan-
sion devices. All devices having significant power requirements
are expected to be self-powered and should not make connec
tions to the power pins on the expansion connector.
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