Re: how to interface 128k parallel ram using 16 address line
As 16 address lines can only address 64kB of memory .. A0-A15 .. you can use any other microcontroller's pin as A16 ..
In other words, before you attempt to read/write memory cells of the upper/lower 64kB bank set/clear that bit ..
For example, in 8051-40-pin-derivative you can use AD0-AD7 as A0-A7, P2-port as A8-A15 and P1.0 as A16, P1.1 as A17, P1.2 as A18, P1.3 as A19, .. and so on ..
In this way you are not limited to 64kB memories ..
Regards,
IanP