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Conference hydra::amiga_v1

Title:	AMIGA NOTES
Notice:	Join us in the NEW conference - HYDRA::AMIGA_V2
Moderator:	HYDRA::MOORE

Created:	Sat Apr 26 1986
Last Modified:	Wed Feb 05 1992
Last Successful Update:	Fri Jun 06 1997
Number of topics:	5378
Total number of notes:	38326

602.0. "Blown serial port " by MTBLUE::PFISTER_ROB () Mon Jul 20 1987 08:47

    My Avatex 1200 modem died a painfull death last week, and it appears
    to have taken part of my serial port with it. I got out my old acoustic
    coupler, and my Amiga put out a carrier, but didn't receive anything,
    not even garbage.  When I got out my debugging terminal, I found
    that I could send characters to it, without errors, but again, couldn't
    receive anything.
    
    My guess is that I blew a UART, but I haven't ever peeked inside
    my Amiga, much less replaced any parts.  How big of a deal would
    it be to find the UART, and replace it?  And would I have to replace
    any other chips while I was going?
    
    Thanks,
    Robb

T.R	Title	User	Personal Name	Date	Lines
602.1		VIDEO::LEIBOW		`Fri Jul 24 1987 00:54`	6
	You would most likely have to replace one of the 8520s. I don't know where you can get one of these guys except at an authorized dealer. It should cost about 45.00 with labor. If you want to know which one of the two 8520's it is, I can look at my schematics but they aren't readily available. THey are underneath 5 weaks collecting garbage in my room.
602.2	found one, (I think)	MTBLUE::PFISTER_ROB		`Thu Jul 30 1987 08:31`	7
	I saw an ad in computer shopper from BG micro, or J&S, or someplace like that for an 8520b for $5.95, is this the same creature? or is this a speciality chip? thanks Robb
602.3	Any supplier of parts out there??	MTBLUE::PFISTER_ROB	No Pain, No Pain	`Mon Jan 18 1988 08:08`	9
	Looks like I need a new Paula, having finally got my A1000 schematics, and my dinasour oscilloscope going. Any idea's where I could buy one? (Not too many authorized Amiga dealers up here, and an even smaller number of helpfull ones) Thanks. Robb
602.4		MTBLUE::PFISTER_ROB	No Pain, No Pain	`Mon Jan 18 1988 08:13`	6
	I'm also considering buying a used/bare-bones[no monitor] A1000, with working serial port. Any good deals on them? Thanks Robb
602.5	How did the avatex 1200 die?	JANIS::DONAHUE		`Mon Jan 18 1988 12:45`	6
	re: .0 How did your avatex 1200 die? What were you doing or not doing? I just bought one and it works fine but I would like to avoid a problem if I can. Thanks in advance. Drew
602.6	not really sure..	MTBLUE::PFISTER_ROB	No Pain, No Pain	`Mon Jan 18 1988 12:56`	10
	re: -.1 I'm not really sure why it did that. It was on for about 8 months straight, and about all I can figure was the heat/humidity got to it. (It was a rather hot week when it died) Avatex did send me a new modem (next model up actually) no problem, but getting the port to work is getting to be a hassle... Robb
602.7	Parts 'R' Us	WINNER::JBERNARD	John Bernard YWO/292-2591	`Mon Jan 18 1988 14:57`	11
	For replacement parts, I have used D-FIVE Associates in Bedford, Mass. They will send you the part along with an invoice. It usually takes 10 days to get the part, since I imagine they get it from CBM. I just got a replacement FAT AGNUS chip from them. Just give them a call and tell them what you want. (617) 275-8892 -john-
602.8		RANGLY::PFISTER_ROB	No Pain, No Pain	`Tue Jan 19 1988 08:09`	5
	Thanks, they do in fact have Paula's, unfortunately they are a bit harsh at $64 ( %20 of the going rate for a used A1000) Robb
602.9	parallel->serial adaptor anywhere?	MTBLUE::PFISTER_ROB	Steak knife, puta hole in my head	`Thu Mar 24 1988 14:51`	7
	In a note recently, someone mentioed scratch-wiring a parallel->serial adaptor. I cant seem to find it, but would be gratefull for more information on such a beast. Thanks Robb
602.10		WJG::GUINEAU	t' = (t-(v/c�)x)/(1-(v�/c�))^� ?	`Thu Mar 24 1988 15:20`	10
	I know someone here did this for an IBM AT one time. It was an 8741 (or one of those CPU,RAM, ROM, UART chips) with a couple connectors. It handled ^S, ^Q (XOFF, XON) flow control. It required external power. I can probably get the scematic and source for the program. But it seems there must be a better way...