Path: utzoo!utgpu!water!watmath!clyde!bellcore!rutgers!ucsd!ames!pasteur!ucbvax!decwrl!sun!pitstop!sundc!seismo!uunet!mcvax!hp4nl!philmds!nlgvax!hans From: hans@nlgvax.UUCP (Hans Zuidam) Newsgroups: comp.sys.amiga.tech Subject: Amiga 500 external floppy disk failure Message-ID: <238@nlgvax.UUCP> Date: 9 Aug 88 22:43:15 GMT Reply-To: hans@nlgvax.UUCP (Hans Zuidam) Followup-To: comp.sys.amiga.tech Organization: Philips Research Geldrop Lines: 39 This is for a collegue of mine... ------------------------------------------------------------------------ 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". What happens during power-up is the following (according to the manuals): 1. Each possible external drive is selected and it's motor-on line is pulsed. 2. This then informs the drive to send it's identification. 3. The Amiga reads this bitstream back and depending on the returned value it determines the drive type: $FFFFFFFF 3.5" $55555555 5.25" $00000000 no disk Now when the software boots, it goes through all detected disks and tries to find out what they are (KICK, DOS). Because the drives are not there they are marked bad. Booting takes ages this way. 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. Adding a 4K7 pull-up resistor 4K7 doesn't. If anyone has a hint on where to look or what to do, we are greatfull. Andrew -- Hans Zuidam E-Mail: hans@nlgvax.UUCP Philips Telecommunications and Data Systems, Tel: +31 40 892288 Project Centre Geldrop, Building XR Willem Alexanderlaan 7B, 5664 AN Geldrop The Netherlands