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704x480 31.55kHz/60Hz monitor driver for AGA
Included in this archive is a hacked Overscan.prefs and a hacked
DBLNTSC.info that allows a larger horizontal overscan in 31.55kHz
(704 instead of 640). As most people know, most VGA monitors have
trouble with 27kHz (the default DBLNTSC rate). And at 29kHz, most VGA
monitors will present a "washed out" picture. That is because they
really were designed for 31.5kHz as minimum for the horizontal scan
rate. The files in this archive mostly alleviates this problem by
providing a 704x480 (352x240 in LoRes) and a 31.55kHz/60Hz scan rate.
There are also a lot of VGA monitors that won't display a 50Hz
DBLPAL display either. And of course, 50Hz screens have that annoying
flicker. 60Hz is really the minimum you should go for viewing
comfort (trust me!).
Problems: The hardware seems to require skipping the first 2 lines
or so or the display will look messed up. This is of course
set properly in the Overscan.prefs file, but I'm warning
you so you won't be freaked out if you try to modify the
Overscan settings. So, the vertical ends up being 480
lines rather than 482.
256-color mode in hires is a bit sluggish, but its still
usable. But of course, this is a bandwidth problem common
to just about any mode other than 15kHz NTSC. I have found
128-color mode to be quite comfortable, though. In any
case, this will provide you with an acceptable display
until you can upgrade your Amiga 1200/4000/etc. with a
Picasso IV or CyberVision card.
Another benefit of this monitor driver is that it allows
a 50kHz/14-bit sampling rate for the audio! Your WAV and
MIDI files will sound great!
Warning: The Overscan Prefs program will be confused by the altered
Overscan.prefs file. This is normal. However, do not try to
alter the DBLNTSC overscan settings with the Prefs program
or the hacked values will be overwritten.
Notes: The Horizontal Sync may have to be adjusted for your monitor
in order to center the display. The HSSTRT and HSSTOP tooltypes
in the DBLNTSC.info file have been set for my monitor so that
the Amiga output is in about the same position as my PC laptop's
output. That way I don't have to fiddle with the controls when
I switch between computers. You may have to use MonEd to get it
just right for your monitor, though.
Enjoy! ----> Tm2
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Contents of driver/moni/dblntsc31.lha PERMSSN UID GID PACKED SIZE RATIO METHOD CRC STAMP NAME
---------- ----------- ------- ------- ------ ---------- ------------ -------------
[generic] 7683 14000 54.9% -lh5- 25ba Apr 19 1997 BootControl
[generic] 4524 11745 38.5% -lh5- a162 Apr 19 1997 BootControl.doc
[generic] 1189 2804 42.4% -lh5- 5860 Apr 19 1997 DBLNTSC31.doc
[generic] 228 1668 13.7% -lh5- e160 Apr 19 1997 DBLNTSC31.doc.info
[generic] 10176 10472 97.2% -lh5- 511d Apr 19 1997 MonEd
[generic] 1613 1616 99.8% -lh5- 0560 Apr 19 1997 MonEd.readme
[generic] 230 423 54.4% -lh5- 0940 Apr 19 1997 DBLNTSC.info
[generic] 133 202 65.8% -lh5- 49c8 Apr 19 1997 overscan.prefs
---------- ----------- ------- ------- ------ ---------- ------------ -------------
Total 8 files 25776 42930 60.0% Jun 15 1997
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