Re: A86: Maskable Interrupts

To: assembly-86@lists.ticalc.org
Subject: Re: A86: Maskable Interrupts
From: ComAsYuAre@aol.com
Date: Sun, 3 Jan 1999 11:27:19 EST
Delivered-To: assembly-86-outgoing@towerguard.unix.edu.sollentuna.se
Reply-To: assembly-86@lists.ticalc.org

In a message dated 1/3/99 2:03:31 AM Eastern Standard Time, rabidcow@juno.com
writes:

> it seems to me that the calculator is always "off".  in normal operation,
>  (when it's not busy) it sits in a halt loop, waiting for an interrupt to
>  tell it to blink the cursor or register a key.  when you turn it off, it
>  shuts down the screen and possibly disables the "200/sec" interrupt
>  signal from whatever generates it.  this is mostly speculation, but it
>  makes sense.

the only way i can figure that it could turn off the 200/sec interrupt is with
port 3.  i haven't bothered looking up any documentation, but that seems the
most likely place.  port 3 seems to dominate the other interrupts and hardware
stuff...

Prev: Re: A86: Sprites (More)
Next: A86: Problem reading keyboard from port (1)
Index(es):
- Main
- Thread