I have 3 ARD - 2650 MEGA's .
In one end of the circuit board is the USB-connector and the Power-connector.
At the other end is a 36 pin connector numbered from 22 to 52 incl 5V and Gnd.
In my project (an EPROM R/O (2716 - 27512)) I plan to use port A as DATA IN, port B as LowADDR 0-7, port C as HighADDR 8-15 and port D as Control (/OE and /RD).
I could assign pin22 As LowAddr 0 , pin 23 as LowAddr 1 ..... pin 29 as LowAddr7 (same procedure for HighAddr and DATAIN), and use DigitalWrite(x,y).. and a lot of code...
Here I find it easier to use direct port Addressing.
But which pins are port A, which pins are port B, which pins are port C, etc....
Can anyone give me a link to a webpage/drawing where the ports are shown as pin numbers ?
Kristian aka snestrup2016