TI-H: Re: A85: Memory Mapped Devices

To: List-Assembly-85 <assembly-85@lists.ticalc.org>
Subject: TI-H: Re: A85: Memory Mapped Devices
From: "A.K.A. TheWiz" <dankna@bergen.org>
Date: Wed, 29 Oct 1997 07:31:50 -0500 (EST)
cc: List-Assembly-92 <Assembly-92@lists.ticalc.org>, List-TI-Hardware <ti-hardware@lists.ticalc.org>
In-Reply-To: <3456D4AD.EE4080EA@Prodigy.Net>
Reply-To: ti-hardware@lists.ticalc.org

> Does anyone know how Memory Mapping is done?  Like, for example, the
> screen on the TI-85 or 92?  I'm not looking for anything real specific,
> just a somewhat general explination as to how it is done/how it works. 
> And actually, something more from a hardware standpoint.  ;)

  Various chips are used to determine the address being read/written, and if
it's in a certain range (usually having high bits set down to a certain one,
which is why VRAM on the calculator is at the end), it's sent to the
mapped-in device.
  HTH.

___Dan_Knapp____The_Mauve_Baron______________________Beep Blip Bonk_______
<dankna@bergen.org><dankna@brain.mics.net> http://users.bergen.org/~dankna
Change Nomic!   http://funnelweb.utcc.utk.edu/~chatham/nomicfaq.html
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