Trouble booting a Classic — #13

Post #13 by pee-air

Source Forum	Trouble booting a Classic — #13
Category	Hardware
Post Date	Mon, 10 Sep 2007 - 20:59
Original URL	https://68kmla.org/bb/threads/trouble-booting-a-classic.9843/

Post

Jumpering of the drive for SCSI ID may not offer much difficulty. Early Quantum HDDs (amongst the commonest, especially in 40-80-120-160-240MB sizes) did not encourage much intervention by users. There was only one ID available, viz 0-0-0, and termination was enabled/disabled with removeable in-line resistor packs. Later Quantums did have the A0-A1-A2 jumper positions for SCSI ID, and a TE (termination enable) jumper position, but termination power still had to come from the SCSI bus.

de

Some of the earlier drives did not use jumpers at all. Instead they had DIP (Dual Inline Package) switches on the drives controller board. The use of jumpers came later. Probably a cost cutting measure, but who really knows? I do find it rather ironic that setting the SCSI ID became more difficult with newer drives though. i.e. jumpers on often poorly labelled pins versus DIP switches which were easily distinguishable and much easier to fiddle with.