Differences between Intel 8080 and 8085 processors

Processor speed (MHz)2 - 3.13 - 6
Power supply+5V, -5V and +12V+5V
On-chip peripherals / components Clock oscillator (similar to 8224)
system controller (similar to 8228)
Serial I/O lines
Address/Data busSeparate address and data bussesMultiplexed address and data
Pins/signals Reset Out pin
RD bus signal
WR bus signal
IO/M bus signal
ALE pin provides encoded bus status information
Interrupts Three maskable interrupts and one non-maskable
Instruction set RIM - read interrupt mask
SIM - Set interrupt mask


2007-09-06 11:13:05
Posted by: richa

the differences have been explained in an excellent manner.i was amazed by the simplicity by which the differences between intel 8080 and 8085 processors were described.it is a perfect description designed for the understanding of an engineering student.

comment on the differance between 8080&8085

2007-10-05 03:28:12
Posted by: Kiprop

The differance is simple and to the point


2008-01-06 10:25:06
Posted by: elumalai

the difference between 8080 and 8085 is detaily explained


2008-08-29 06:34:25
Posted by: anand kaushik

i have pleased on seeing this simplicity,
it is really best for engineering student.

re: Is a Clock Oscillator really a "peripheral"?

2010-10-22 06:54:32
Posted by: Mr Joseph P Campbell

I've never thought of the Clock Oscillator of a microprocessor system as being a peripheral device; it's an essential device in a microprocessor's clock generation circuit. From what I've been learning, I'd only term a device as being a peripheral if it's connected to a micro's I/O ports!

Response: I corrected the row title. Thank you!

Power Supply

2013-10-15 09:35:09
Posted by: amyk

The 8080 uses enhancement-load NMOS, so it needs 3 supply voltages:
+5V is the normal operating voltage of the NMOS process.
-5V is substrate "back-gate" bias.
+12V is load transistor gate voltage

The 8085 changed to depletion-load NMOS which made it possible to use a single +5V supply.

Last modified: 17 Oct 2013
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