Intel 4040

New features

• Interrupts
• Single Stepping plus both hardware and software HALTing.
• Low-power standby

  Extensions

• Instruction Set expanded to 60 instructions
• Program memory expanded to 8 KB, using bank switching
• Registers expanded to 24
• Subroutine/interrupt stack expanded to 7 levels deep

  Characteristics

• Data Bus: 4-bit
• Address Bus: 12-bit for ROM, effectively 13-bit with use of bank-switching commands; effectively 10-bit or 8-bit for RAM
• Voltage: -15V DC
• Operating Frequency: 500 to 740 kHz main clock ; 62500 to 92500 8-clock machine cycles per second, each instruction requiring either one or two machine cycles to read and execute, meaning a rough average of 62 kIPS at 740 kHz with an equal mix.
• Performance: Claimed execution time of ~850 µs to add two 32-bit numbers, or around 1175 such operations per second and approx 10 machine cycles per digit-pair.

  Designers

New support chips

• 3216 and 3226 4-bit parallel bus drivers
• 4101 – 256 x 4-bit Static RAM
• 4201 – Clock Generator, 500 to 740 kHz, using 4.000 to 5.185 MHz crystals
• 4207 – General Purpose 8-bit Output port
• 4209 – General Purpose 8-bit Input port
• 4211 – General Purpose 8-bit I/O port
• 4265 - Programmable general-purpose I/O
• 4269 - Programmable keyboard/display
• 4289 – Standard Memory Interface
• 4308 – 1K x 8-bit ROM plus 4 x 4-bit IO ports
• 4316 – 2K x 8-bit ROM
• 4702 – 256 x 8-bit EPROM

  Production