Re: LCD Addressing - & - Expanded Mode So, this still doesn't help me figure out how to address the LCD.  It  has A8 and A9 connected along with a CLK from Port A. Does this mean that the LCD is NOT memory mapped?  Do I first have to  write to Port B then write to Port A, to clock it.  This must mean  that I have to go into and out of expanded mode to use both the LCD  and the SRAM?  That's kinda wierd. Anything else you can point me to as far as addressing the LCD and  accessing SRAM via assembly code? > Date:          Sun, 03 May 1998 22:01:27 -0700 > From:          Chuck McManis  > Reply-to:      cmcmanis@freegate.com > Organization:  Freegate Corporation > To:            Mike Davis  > Cc:            handyboard@media.mit.edu > Subject:       Re: LCD Addressing - & - Expanded Mode > Mike Davis wrote: > > Two questions: > >  > > 1) I'm having a little trouble figuring out how the LCD is addressed. > > It uses A8 and A8 but also is clocked from Port A. >  > You can only run the LCD when in single chip mode. >  > > 2) The Mode B pin is always grounded.  How does the system get put > > into expanded mode since that mode requires Mode B to be high during > > reset?  I assume it must be changed (the mode) by the downloaded > > program. >  > This leaves the chip in 'special test mode' that lets you go into and > out of expanded mode by writing the config register. >  > --Chuck >  -- ----------------------------------------------------------------- ipscone@halcyon.com                                 Shoot-To-Win! Protect the 2nd Amendment!               Your rights may be next! -----------------------------------------------------------------