At 11:05 -0800 3/31/09, zeroid wrote: >A friend's IIci (running OS 7.1) freezes whenever either a SCSI >external hard drive or zip drive is connected. If I recall correctly, >this occurs even when the SCSI device is off--merely connecting the >cable seems to have a bad influence. Both of the SCSI devices work >fine with a beige G3 running OS 8.6. > >I'm not well versed in the voodoo which is SCSI. The external hard >drive has a selector for setting the device number (how do I find the >SCSI number of the IIci itself?) but the zip drive doesn't. > >The ultimate aim is to clone the possibly failing internal hard >drive's contents. The IIci has a 200MB hard drive so copying to >floppies is impractical. Is it feasible to swap the IIci's hard drive >into the external case and then copy it onto the beige G3? What type >of connector & pin number does the IIci hard drive have?
Others comments are good. In addition: "Standard SCSI id's are set by Apple so that the internal drive is 0 and the machine itself is 7. The internal connector will be a 50 pin two row circuit board connector on ribbon cable. 0.050 spacing between wires and 0.100 inch between the pins. Zip drives have only two options for SCSI ID. They are switch selectable for 5 or 6. They also have a switch to enable internal terminators. And they also use 25 pin connectors which are an Apple-standard that never made it into the rest of the world. (Actually they share ground wires when they really shouldn't.) SCSI probe is a piece of software from, I think, Adaptec that you can install as an application or a control panel and it will let you see SCSI ID's of connected devices whether they are mounted or not. Older SCSI disks had three 9-pin chips in in-line sockets on their circuit boards. They are terminators and you had to remove them for disks that were not at the end of a SCSI bus. Note the black dot indicating pin 1. And. . . SCSI was not complicated until people started making it "simple" by automating the connection using proprietary schemes. All ID's different, 50 wires, and terminators at the ends - simple. -- --> From the U S of A, the only socialist country that refuses to admit it. <-- --~--~---------~--~----~------------~-------~--~----~ You received this message because you are subscribed to the Vintage Macs group. The list FAQ is at http://lowendmac.com/lists/vintagemacs.shtml and our netiquette guide is at http://www.lowendmac.com/lists/netiquette.shtml To post to this group, send email to [email protected] To unsubscribe from this group, send email to [email protected] For more options, visit this group at http://groups.google.com/group/vintage-macs?hl=en Low End Mac RSS feed at feed://lowendmac.com/feed.xml -~----------~----~----~----~------~----~------~--~---
