. AMD also made many Microcontrollers based on the 29K design, they very widely in what features (and to what extent) they provide. However, as with all microcontrollers they include I/O control, ROM control and about everything needed to interface to a system. As a system designer this gives you the ability to choose the features you need while still conserving pin counts and power dissipation.
The 29205 has no cache, ALU or MMU. It is the value line of of the 29k MCUs.