• Interrupt
• Single Step

Extensions

• Instruction Set expanded to 60 instructions
• Program memory expanded to 8K bytes
• Registers expanded to 24
• Subroutine stack expanded to 7 levels deep

New Support chips

• 4201 - Clock Generator
• 4308 - 1K byte ROM
• 4207 - General Purpose byte Output port
• 4209 - General Purpose byte Input port
• 4211 - General Purpose byte I/O port
• 4289 - Standard Memory Interface (replaces 4008/4009)
• 4702 - 256 byte UVEPROM
• 4316 - 2K byte ROM
• 4101 - 256 4-bit word RAM