A89: Re: ROM 1.05 and grayscales
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A89: Re: ROM 1.05 and grayscales
What? I can see four shades in programs such as SMQ (doors version) and
Tetris just fine on the 89 v1.05 ROM.
-Miles Raymond
----- Original Message -----
From: Xavier VASSOR <xvassor@mail.dotcom.fr>
To: <assembly-89@lists.ticalc.org>
Sent: Friday, August 27, 1999 8:14 AM
Subject: A89: ROM 1.05 and grayscales
> 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
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