PHR00JG%TECHNION@TAUNIVM.TAU.AC.IL ("Jacques J. Goldberg") (05/25/91)
Re. Kaypro II can't boot from disk A. Very simple. As always, there is IBM (which ignores the rest of the world) and the rest of the world. Since KAYPRO belongs to the rest of the world, I assume that the common 34 wire flat cable was left intact with all wires parallel. On each of your drives there is a set of jumpers where you almost certainly will recognize that ONE of DS0 DS1 DS2 DS3 is jumpered; DS0 on your present A, DS1 on your present B is ALMOST certain. Just exchange the position of these jumpers. You will also notice that on ONE drive board there is a vacant socket compared to the other. The vacant socket MUST be on the drive which is NOT at the end of the cable, the thing in the socket which looks like a chip is a set of resistors terminating the flat cable for correct impedance. Be EXCEEDINGLY careful not to break its legs if you try to relocate that pseudo-chip on an other drive, when you remove it. The caveat about IBM is that for reasons which my limited brain was unable to understand, BIG BLUE of course can't use the DSn jumpers for what there were designed for, and obtains the same result by crossing a few wires in the cable, which then ceases to be flat between the first and the second drive. In this arrangement, both drives have the jumper selection in the same position. Finally, some old (or is it recent) drives have the jumpers labelles DS1 to DS 4, not DS0 to DS 1. Just in case some reader might need such clarification. Also, it is NOT a Law of Nature that the lowest drive is A etc... The system generation software with my LOBO MAX-80 allows to change these assignments. Even if the KAYPRO has the same capability, it won't help, since you can't boot your machine, **BUT**, if the Kaypro HAS this software, and you can run it to write a new boot disk on an OTHER machine, then you could get a boot from drive B without opening your machine. Jacques J. Goldberg "Prof. of Physics"