Prince:

Please, pretty please, do not send HTML mailings to the PIC list. There are
quite a few people here that use plain text E-mail readers.
I ended up having to go to the PICLIST archive simply to get your question.

>Hello PicSters!
>
>I was wondering how i could connect either a 6264 SRAM (64k) or a 6116LP-4
>(16k) SRAM to my pic16f84?
>
>Otherwise i have some old 30pin 1 mb ram modules out of a 486 computer, can i
>use these in any way?
>

Jinx covered a lot of ground in his reply. I'm going to add another. You can
save yourself a lot of grief and real estate by changing PICs. Parallel
interfaces is one area where size does matter. An extra port of three can
greatly simplify your interfaces.

These are the PICs I believe almost everyone needs in their arsenal:

Extra small: 12C509. 8 pins. few I/O. enough memory to be useful.
      Small: 16F628. 18 pins. Superior in every way to the 16F84, which I now
             consider to be an obsolete part.
      Large: 16F872 or 16F876 depending on if you want a bootloader or not.
             These 28 pin parts adds an extra port to the mix and have true
             A/D. At 8K the 16F876 has enough firepower to have a bootloader
             installed. One could be squeezed into the 16F872, but may require
             using the onbaord USART to accomplish it. Maybe.
Extra Large: 16F877 hands down. Just like the 16F876 with two extra ports
             attached.

Note that the 16F84 isn't in the list. Some days I think Microchip should
stamp the data sheet with "Do not use this part in new designs.". The fact
of the matter is that you're going to have to attach so much support circuitry
to it to accomplish the task, that you would have been better off picking a
better part.

BTW I would have picked a 16F877 and probably 2 74HCT573 octal latches.
I'd attach the latches to PORTB or PORTD and then control from the 3 bits
of PORTE.

But a 16F84 is a bit lightweight for the task.

BAJ
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