A89: ROM 1.05 and grayscales

To: assembly-89@lists.ticalc.org
Subject: A89: ROM 1.05 and grayscales
From: Xavier VASSOR <xvassor@mail.dotcom.fr>
Date: Fri, 27 Aug 1999 15:14:32 +0200
In-Reply-To: <d7a6fc09.24f73e1e@aol.com>
Reply-To: assembly-89@lists.ticalc.org


Hi,

You maybe know that the grayscales no longer work on the new 1.05 ROM
I think I've found out why : you know the greyscale handler relies on auto
interrupt one which runs at 300 Hz. This handler switches 2 virtual screens
in B&W, giving the impression of 4 gray levels, and then RUNS THE OLD AUTO
INT 1 HANDLER, ie the TIOS one in most cases.

The problem is that it seems that the auto int 1 handler from the new 1.05
ROM is too slow to allow a sufficient refresh rate -> there is no
impression of 4 grayscales..

So, what ? The solution'd be that the grayscale handler no longer calls the
old auto int 1 handler, but this will prevent the program to use functions
such as userlib::idle_loop, as well as the APD features when it is running
in grayscales.

What should I do ?
Xavier VASSOR
E-mail:xvassor@mail.dotcom.fr
Homepage: http://start.at/doors
ICQ:10241721

Follow-Ups:

Re: A89: ROM 1.05 and grayscales

From: Andrew Magness <AndrewM@ev1.net>

A89: Re: ROM 1.05 and grayscales

From: "Miles Raymond" <m_rayman@bigfoot.com>

References:

A89: Re: Cutting off sprites

From: TurboSoft@aol.com