olson@endor.harvard.edu (Eric Olson) (06/18/86)
Its my understanding, after reading all kinds of electronic and non-electronic info about the 520 and 1040ST, that: - Initially, the 520ST had an analog RGB and non-standard hi-res B&W video out - Future (and current) 520STs have a composite video out and an RF modulated video output. - The 1040ST has only the analog RGB and non-standard B&W video out I have also read one comment that seems to indicate that the 1040ST has composite video on some pin, but not brought out to a video jack. QUESTIONS: 1) What resolution modes can be displayed through the composite video out? 2) What resolution modes can be displayed through the RF Modulated output? 3) Is there really composite video on some pin of some connector on the 1040ST? 4) Since I must have composite out for my application, what is the difference (besides cosmetic) between a 520ST upgraded to 1 Meg & 2 DS Drives versus a 1040ST with a DS external drive? Will they both run the hard disk? Thanks muchly. -Eric
neil@atari.UUcp (Neil Harris) (06/19/86)
In article <22@harvard.UUCP>, olson@endor.harvard.edu (Eric Olson) writes: > > 1) What resolution modes can be displayed through the composite video out? > 2) What resolution modes can be displayed through the RF Modulated output? The answer to both is the same: both low and medium resolution will be displayed through the composite, Rf, and RGB outputs. Unless you have a _wonderful_ TV set, picture quality of Rf in medium resolution is not too great (TV's don't have enough bandwidth). > 3) Is there really composite video on some pin of some connector on the 1040 ST? No. > 4) Since I must have composite out for my application, what is the > difference (besides cosmetic) between a 520ST upgraded to 1 Meg & 2 DS > Drives versus a 1040ST with a DS external drive? Will they both run the > hard disk? They are the same! Both will run the hard disk. -- --->Neil @ Atari ...lll-crg!vecpyr!atari!neil or ...lll-lcc!vecpyr!atari!neil BIX: neilharris CIS: 70007,1135 Delphi: NEILHARRIS GENIE: nharris WELL: neil Atari Corp. BBS 408-745-5308 US Mail: Atari Corp. 1196 Borregas Ave. Sunnyvale, CA 94086 "I'm a 20th century man but I don't want to die here." -- Ray Davies
jhs@disunix.UUCP (06/24/86)
If you have a 520 with RF modulator output, you should be able to add a composite output fairly easily, as the baseband input to the RF modulator is precisely the composite signal. All you have to do is bring it out, possibly with an amplifier stage if the level is not right. More likely just a switch or a parallel tap off the input to the modulator will work fine. I haven't seen the schematic, but you may also pick up some resolution on the composite output by removing a "slowdown" capacitor put in to keep the TV modulator bandwidth down. Or, you might be able to leave such a capacitor in place and pick off your signal before the slowdown circuit has affected it. Good luck. -John Sangster jhs@mitre-bedford.arpa