| Title: | Atari ST, TT, & Falcon |
| Notice: | Please read note 1.0 and its replies before posting! |
| Moderator: | FUNYET::ANDERSON |
| Created: | Mon Apr 04 1988 |
| Last Modified: | Tue May 06 1997 |
| Last Successful Update: | Fri Jun 06 1997 |
| Number of topics: | 1433 |
| Total number of notes: | 10312 |
Hello there fellow Atariites,
Could you please provide me with a little help. Unfortunately I
do not have too much information to hand so if there is too little
apologies for wasting your time.
1) I have a Microvitech colour monitor which was originally used
with a Sinclair QL. It has a 7 (or is it 8) pin din on the back of
it and I am trying to find out how to connect it to my Atari 520STFM
using the monitor plug. If anyone of you knows the pin connections
I would be most grateful for any help.
2) Is there any danger in formatting disks using a super formatting
proggy (DCFMTCTR.PRG) using 82 tracks, 10 sectors and the fast option
which on a single sided drive offers about 408000 bytes ?
3) Using WHACK, how do you get the text size to approximate that
of a vt220. ie instead of 'gigantic' text which will not allow every
thing to fit on the screen ?
Thanks in advance for your help in advance
:-) Jonathan Warburton-Brown
| T.R | Title | User | Personal Name | Date | Lines |
|---|---|---|---|---|---|
| 195.1 | Whack answers, and some guesses for the others | PRNSYS::LOMICKAJ | Jeff Lomicka | Fri Aug 12 1988 15:31 | 46 |
| 195.2 | ...with a little help from my friends | COMICS::DSMMGR | Tue Aug 16 1988 10:19 | 31 | |
Jeff,
Thanks a lot for all the valuable info you gave me about the questions
I posed, however I am still having problems getting my monitor to
work. I have a bit more info now regarding the pins on the Cub,
the problems arise when trying to connect the Atari to it. I have
read the Atari manual but would appreciate any further help you
or anyone else can offer. Sorry to be a pain.
The pin info I have which I obtained from the manufacturers is as follows :
locating lug
!
V
=== o <--- red
vert sync.---> o o <-- green T.T.L
ground -> o o <--- blue
o
^
!
composite sync.
Please note that T.T.L is written next to the DIN plug.
Once more, my thanks in advance
Jonathan
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| 195.3 | SEDOAS::WATT | It's Life Jim but not as we know it | Tue Aug 16 1988 12:13 | 6 | |
If my memory serves me right this monitor needs modifacation before
it can be used on the Atari. It has TTL inputs. I believe it can
be fixed if you write to Microvitec and ask.
Peter
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| 195.4 | You do get 24 lines with Whack's 7x7 font | PRNSYS::LOMICKAJ | Jeff Lomicka | Tue Aug 16 1988 14:22 | 12 |
| 195.5 | ...re: .2 ..Stuck with a Spectrum rainbow... | LOOKIN::SOWTON | Wed Aug 17 1988 09:42 | 38 | |
The bottom line answer to your query is...you have a problem.
Although this may seem slightly negative, it's based on my
experience with the same monitor.
The video output from the Atari is analogue (between 0 and 3v, I
think ) ie..the intensity of the colour is proportional to the
output voltage. However the particular interface in your monitor
is designed to work on TTL logic signals (0 and 5v), ie. you can
only have combinations of Red, Blue and Green. The effect of this
is that only seven colours are available, plus Black and White of
course.
So even if you limit the voltage swing to the maximum of the
analogue signal you would still have the problem of not being able to
display enough different colours to make it useful.
I contacted Microvitec when I was trying to convert my monitor
and they said that there was an analogue interface available but it
would cost 120 pounds. Bearing in mind this represented 50% of the
cost of the monitor, I thought it a bit steep for a board with a
bunch of resistors...
Anyway, to cut a short story long, the way I got round the problem
was to bypass the TTL input and wire directly to the video amplifiers
internally via limiting resistors chosen to give the right intensity
display. These resistors were necessary because bypassing the TTL
input also meant bypassing the intensity control.
I don't remember exact connection details but I could be persuaded
to remove the back and have a look if you like.
Hope this helps...
Bob
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