Re: A86: Re: Ports

To: assembly-86@lists.ticalc.org
Subject: Re: A86: Re: Ports
From: ZeromusMog@aol.com
Date: Thu, 10 Dec 1998 20:00:55 EST
Delivered-To: assembly-86-outgoing@towerguard.unix.edu.sollentuna.se
Reply-To: assembly-86@lists.ticalc.org


In a message dated 12/10/98 3:48:07 PM Pacific Standard Time, electrum@tfs.net
writes:

> Summary (from file):
>      port 0 - Screen Offset, WRITE ONLY
Offset? Is this like some kind of second screen? Or is this the screen memory
area?
(BTW, a little off topic, but BASICALLY, how does a driver differ, from a
programming standpoint, than the memory method?)

>      port 1 - Keypad
Is this where you read from the keypad directly? Could Mr. Nigel use this to
make Mario stop hoppin' up and down like a penguin or something? :)

>      port 2 - Contrast, WRITE ONLY
Wait, if it can't be read, then how do fadein/fadeout programs know how to set
the contrast at the right level when it's done? I'm very interested in using
this in future programs...

>      port 3 - ON Status, LCD Power
>      port 4 - Power Mode
Like low/high power?

>      port 5 - Page change at $4000-$7FFF
>      port 6 - Page change at $8000-$BFFF
>      port 7 - Link Port

Follow-Ups:

Re: A86: Re: Ports

From: Aaron Curtis <acurti1@umbc.edu>

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