kevin@kjvw.UUCP (Kevin VandeWettering) (05/15/88)
I have an Atari ST, which due to brain-damage, has only RGB monitor outputs. I would like to be able to record animations generated with CAD3d, Aegis Animator etc. for use with my VCR. Does anyone have any ideas for building (or know where I can get) a board which will convert RGB video to composite?. Because of my "stone knives and bear skins" tool box, I am looking for a minimum chip count, simplicity is secondary to expense. Thanks kevin@kjvw
brantly.henr@XEROX.COM (05/24/88)
Practical Solutions is now marketing a product that will convert ST RGB monitor outputs to both Composite & RF signals. The price is $119.00 + $3.50 shipping if you order directly from them (expect at least a one month back-order). I do have one of the units on order, as soon as I have an opportunity to evaluate it I'll post comments to the net...... I am in no way connected with Practical Solutions, except that my credit card account now has ($119.00 + $3.50 shipping) added to the balance. In case you want to give Practical Solutions a call for one of their brochures on the product, it's (602-884-9612) in Tucson.... Dennis..... Brantly.Henr@Xerox.Com Xerox R&D
Robert_Lisowski@rubbs1.UUCP (Robert Lisowski) (05/28/88)
The Motorola MC1377 RGB to PAL/NTSC converter chip is the basis for alot of the converters out there. The only problem is creating composite sync (needed by this chip) from the ST's seperate sync. The national semiconductor MM5321N (rather expensive at $11.95, versus under $3. for the motorola) is a TV camera sync generator that outputs equalized pulse composite sync that can drive the motorola. The sync can be pulled off seperately from the ST and input to the national chip's reset pins. The national
chip also has index pulses for field storage applications. I have built alot of video equipment (genlock, composite converters, field storage etc.) that interfaces with the ST.
Practical Solutions is now (?) selling their Video Key, which is a composite converter for the ST. It goes for about $120.
Motorola app note # AN932 describes the use of the MC1377 chip in a circuit. The chip is in the linear databook.
Rob rutgers!rubbs1!robert_lisowskihase@netmbx.UUCP (Hartmut Semken) (06/13/88)
In article <55.229FB0C4@rubbs1.UUCP> Robert_Lisowski@rubbs1.UUCP (Robert
Lisowski) writes: >The Motorola MC1377 RGB to PAL/NTSC converter chip is
the basis for alot of the converters out there. The only problem is
creating composite sync (needed by this chip) from the ST's seperate
sync. The national semiconductor MM5321N (rather expensive at
$11.95, versus under $3. for the motorola) is a TV camera sync
generator that outputs equalized pulse composite sync that can drive the
motorola. The sync can be pulled off seperately from the ST and input
to the national chip's reset pins. The nationa l >
Hmm, do you really need it? My german ST (520 ST+/1985) has a "circurit"
to do the trick: one transistor, a diode and a couple of resistors (I
never worked out, how it works :-).
But you don't need that either: just apply HSync to the composite sync
of the MC1377 and green and VSync to the green pin.
If that does not work, swap HSync and VSync. It works...
Hope to save you some money...
hase
--
Hartmut Semken, Lupsteiner Weg 67, 1000 Berlin 37 hase@netmbx.UUCP
High on a rocky promontory sat an Electric Monk on a bored horse. (D. Adams)