Path: utzoo!utgpu!water!watmath!clyde!att!ihnp4!cbmvax!grr From: grr@cbmvax.UUCP (George Robbins) Newsgroups: comp.sys.amiga.tech Subject: Re: Amiga 500 external floppy disk failure Message-ID: <4489@cbmvax.UUCP> Date: 15 Aug 88 02:32:34 GMT References: <238@nlgvax.UUCP> Reply-To: grr@cbmvax.UUCP (George Robbins) Organization: Commodore Technology, West Chester, PA Lines: 24 In article <238@nlgvax.UUCP> hans@nlgvax.UUCP (Hans Zuidam) writes: > From: Andrew Dickman (Philips Telecommunications and Data Systems) > Subject: Amiga 500 external floppy disk failure > > We have an Amiga 500 which (after booting) thinks it has 4 disk drives: > 1 internal and 3 external. The three external ones are marked "BAD". > > We suspect that's it has something to do with pin 1 on CN5 (_RDY) (Does > the "_" means active low?). This line remains low during startup. Yep, this is a low active signal. I've seen this problem before. It usually idicates that either some drive is holding ready low all the time or there is a short on the board that is grounding ready. Other possibilities are that the 8520 that ready goes into is blown or one of the select lines is always being held low. The gary chip handles this for the internal drive, so conceivably it could be blown also... -- George Robbins - now working for, uucp: {uunet|ihnp4|rutgers}!cbmvax!grr but no way officially representing arpa: cbmvax!grr@uunet.uu.net Commodore, Engineering Department fone: 215-431-9255 (only by moonlite)