Sure. Take a look at the front of your average RM03. There is a small
molex plug at the top, and one at the bottom. Signal in and out for
spinup control.

Chris


Johnny Billquist wrote:

> On Fri, 5 Mar 2004, Christopher Zach wrote:
>
>
>>MASSBUSS devices included sequencing circuitry. Basically a serial cable
>>that goes from system to system.

>
>
> Really? I cannot remember any such stuff on any massbus devices that I've
> worked with, and that includes RP04, RP05, RP06, RP07, RM02 and RM03,
> TU45, TU77 and TU78.
>
> Older MSCP disks have it, however. RA60, RA80, RA81 and RA82 to be
> specific. The power sequencing bus is simple, though. Not even serial.
> It's just an enable signal that passes through all disks, and a disk is
> not allowed to spin up if the signal isn't available. The first disk in
> the chain have a "terminator" at the in-socket, to enable it to spin up.
>
> Newer than that instead uses a delayed power control bus.
>
> Johnny
>
> Johnny Billquist || "I'm on a bus
> || on a psychedelic trip
> email: bqt@update.uu.se || Reading murder books
> pdp is alive! || tryin' to stay hip" - B. Idol
>

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