Apple IIgs Specifications download pdf (Page 15)

Developer Technical Support September 1989

Apple IIGS

#68: Tips for I/O Expansion Slot Card Design 7 of 6

Since the Apple IIGS was released, several “super” expansion cards have become available.

These cards typically provide a lot of performance and functionality, but in most cases, the

power consumed by one card is more than the specified power available to all the expansion

slots. Generally these cards work without problems. However, when several “super” cards are

installed in a IIGS system, the total power drawn can exceed the available power supply capacity.

This increase in power dissipation within the II

GS case can cause excessive heating and other

associated problems when the internal case temperatures exceed the design specifications. This

could conceivably damage the II

GS power supply. Please minimize the power requirements of

expansion card designs wherever possible to avoid these problems.

Further Reference

• Apple IIGS Hardware Reference

• Apple IIGS Firmware Reference

• Apple IIGS Technical Note #28, Interface Card Design Guidelines

• Apple IIGS Technical Note #32, /INH Line Anomaly

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Apple IIgs Specifications Page 15