test-drb November 2005

test-drb@ccmp.vtda.org

255 participants
692 discussions

whatsit?? Old stuff, bench electronics? Radio? I dunno.

by jwest＠classiccmp.org

Quite some time ago I got this stuff from my high school, I believe it came >from the physics department. I mentioned it on the list and some expressed interest in pictures. Just now got around to it. See http://www.ezwind.net/jwest/whatsit Should I pitch this stuff? Anyone know what it is? Jay

18 years, 5 months

PC disk drive termination

by ard＠p850ug1.demon.co.uk

Somebody earlier claimed that IBM didn't bother with termination on the disk drives in the PC family. I've just looked in the 'Hardware Maintenance and Service' manual for the PC/AT. This is the only HMS manual I have (I don't normally bother with boardswapper guides), but I would be suprised if the same principles didn't apply to the PC. Anyway, the manual says : 'Diskette Drive o The terminating resistor must be installed on drive A (top unit). o In a system unit with 2 diskette drives, remove the terminating resistor from drive B (bottom unit) for proper operation. o The diskette drive end of the signal cable is attached to diskette drive A. Fixed disk drive o The terminating resistor must be installed on fixed disk drive C (left unit) o In a system unit with 2 fixed disk drives, remove the terminating resistor from fixed disk drive D (right unit) for proper operation ' There are diagramss showing the location of the terminating resistor pack on the drive PCB that I can't sensibly reproduce in ASCII. -tony

18 years, 5 months

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test-drb November 2005