>>From: Arnaldo Echevarria

>>>-Is it possible to make PIC16C84 that drive a SIMM memory module(old
>>>ones, 30 pins)? Where can I find some informations?
>>>-What is the simplest programer to build? I visited SIS and tried two
>>>programer: Com84 and BlowPIC, but they both don't wokrs.

>>I'm also interested in this.  Actually, I've got a lot of old 1Megx8
>>drams (8) that i'd like to put to good use.

William Chops Westfield wrote:
>
> THere was an ap note for the phillips 8x??? (64 pin 8051 derivitive)
> describing a printer buffer that drove dram from software that might
> be applicable.  The 8051 did the address multiplexing, drove CAS and RAS
> from software, and did software refresh...
>
> I don't think the 16C84 has enough pins to make it easy, but the above
> would make a reasonable start...
>
> BillW

I wtote a driver for a Z80 to 4Mb Simm Module using software (no
hardware multiplexers)
see:  http://www.labyrinth.net.au/~donmck/z80.html

Parallax has in PDF format on their FTP site (Applications Handbook) a
PIC16C5x to 1 Mb Dram by 1 bit interface. All software and hardware is
given.

But I agree with Bill, the 84 isn't a good choice for a 30 pin Simm
Memory Module (8 or 9 data bits) interface. I guess someone will prove
me wrong. :)

Don McKenzie donmck@labyrinth.net.au
DonTronics Tullamarine, Australia
http://www.labyrinth.net.au/~donmck
SimmStick(tm) A PIC proto PCB the size of a 30 pin Simm Memory Module.