In article <[EMAIL PROTECTED]>, ZN <[EMAIL PROTECTED]> writes >On 2/5/02 at 1:02 AM Roy Wood wrote: > >>> Well, yes, there's just one problem: they are from IBM and have NO >>> jumpers. It still may be possible to get them to work on a GC/SGC, >>> I'm looking into it. > >> Just use a twist in the cable to change the selector lines it is >> pretty simple. > >Yes, but that only takes care of the select lines - and sometimes not even >that. Most new PC drives also make assumptions at what signals are used for >what. For instance, a drive I used recently assumes that activating the >motor on signal also selects the drive. But that's small fry. That same >drive thinks there's always a disk in it once connected to the SGC. It also >only works right with DD disks even though it's a HD drive. On the PC two >signals are used (three in a ED drive) to communicate the density and >presence of a disk. This is normally set by jumpers on older drives - no >such luck on the new ones, although most actually have sensible defaults. >In cases when you deal with drives manufactured to a particular narrow >spec, all bets are off :-(
Is the logic for disk drives 4 bit then ? 0 0 0 0 - low 1 1 1 1 - high -- Malcolm Cadman
