Re: A86: the 0 port

To: assembly-86@lists.ticalc.org
Subject: Re: A86: the 0 port
From: the_laser@juno.com (Andy S Johnson)
Date: Thu, 19 Mar 1998 19:29:46 -0700
Delivered-To: assembly-86-outgoing@towerguard.unix.edu.sollentuna.se
References: <19980316232652.13949.qmail@www07.netaddress.usa.net>
Reply-To: assembly-86@lists.ticalc.org


Can somebody explain exactly how the 0 port is used?  The 86ports.txt
isn't much help.
---
Andy Johnson
"Change is inevitable...
     except from vending machines"

On Tue, 17 Mar 1998 14:43:11 +0100 Robert Niedziela <meth@friko2.onet.pl>
writes:
>
>I have that same problem, changing display memory every 5 interrupts 
>is minimum, but it starts to flick.
>
>KIRK MEYER wrote:
>
>> hello. i finally realized i was unsubscribed. i have a question 
>about port 0. i know it switches the memory that the screen displays, 
>but there are some funny things about it. when the port is alternated 
>every other interrupt routine, nothing happens. is the screen updated 
>every OTHER interrupt? if you switch it every four, it does something, 
>and it does something very odd with lots of lines going down the 
>screen. if you switch it every six or eight, it works but flickers way 
>to much. any help is appreciated.

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References:

A86: the 0 port

From: KIRK MEYER <kirkmeyer@usa.net>

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