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Hi guys, I just wanted to tell you that I managed to fix the Apple HD 20 SC. Here's what happened: the HD had a pre-installed System inside (I don't know which version and I don't know on which machine it performed the installation). It was therefore a bootable HD and (oddly), any selection of...

Yes exactly!  what I tried.  considers that HD works, because when I connect it to my Macintosh SE, it immediately starts with booting from the HD20sc.  unfortunately I can no longer dictate the hd20sc so that it starts but as a secondary.  always starts as primary. note: the adapter you see...

yes exactly Crutch, it is a terminator and from what I have read around it seems that this type of hard disk (20 SC) needs the terminator if there is no other device connected. Anyway I tried to disconnect it but equally my plus does not recognize it. I have to turn on the HD when the plus...

I tried with both the System 3.2 and the System 3.3 following the procedure you described but unfortunately I don't see the HD in the finder. maybe I need the floppy called HD 20 startup?

Thanks Crutch, I immediately tried the configuration as you told me but my Macintosh Plus (turning on the HD first and then the Macintosh), does not start, or rather, starts but then resets immediately after to continue so indefinitely . I have tried HD with a Macintosh SE and it works. You told...

A few days ago they gave me an original Apple 20 external HD as in the picture. With the HD I also have the terminator and the scsi cable. In the absence of documentation, I don't know where the terminator (below or above?), and the connector, goes. Then there is a number near the connectors...

thanks, I will give a general cleaning and maybe a new welding point and then eventually I will change those two components

Bolle, do you mean these two?

Thanks Bolle, for your interest, I think I'm sure it's the logic board because I tried to change the analog card (including the card that goes behind the CRT tube), and the problem is exactly the same, so I conclude that both the logic card and the cause. Today I will change the two 74LS393 as...

Hi everyone, I'm new to the forum and I hope to be in the right place for the help you want to give me. I introduce myself here, since I honestly didn't find the presentation area. My name is Roberto I am Italian and for some time I would like to fix my macintosh SE 30, which has an unusual...