not yet, I'm running errands for a few hours.
About to add external CD rom.
- Thread starter RedDaemonFox
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A warning: since the cable you are using have a terminator (read on it: it must have the word "active" written), sack out the terminator on the A3000 and then shop an active passtrough terminator (yes, they exists!) for the controller.
Also remember to set one (just one!) SCSI device to provide termination power. Without +5V in the correct pin/wire (which Amiga don't provide) the terminators will not work at all, rendering in unstable working or even no boot at all.
Also remember to set one (just one!) SCSI device to provide termination power. Without +5V in the correct pin/wire (which Amiga don't provide) the terminators will not work at all, rendering in unstable working or even no boot at all.
Hmm? The cable has a terminator, but there is no other terminator on the bus? I guess my 3k has that onboard termination
Yes, the A3000 have a passive terminator.
Rule number #1: don't mix active with passive terminators.
Another option is: attach the side with the terminator on the SCSI header on motherboard/SCSI daughtercard and install an HD as the last physical device and set it to provide termination power and termination enabled (term_power & term).
Most modern SCSI HD units have both options. Just very old SCSI HD have the resistor power packs acting as passive termination. Active termination is always better.
Remember to invert the cable and disable termination when you hook an external SCSI CD/DVD drive (and install an external active terminator).
Like this one:
Rule number #1: don't mix active with passive terminators.
Another option is: attach the side with the terminator on the SCSI header on motherboard/SCSI daughtercard and install an HD as the last physical device and set it to provide termination power and termination enabled (term_power & term).
Most modern SCSI HD units have both options. Just very old SCSI HD have the resistor power packs acting as passive termination. Active termination is always better.
Remember to invert the cable and disable termination when you hook an external SCSI CD/DVD drive (and install an external active terminator).
Like this one:
So, if I invert the cable, my drive has a few options:
Term. power from drive
term power from scsi bus
term power to scsi bus
term power to scsi bus and drive
enable scsi terminator
which one should I use?
Term. power from drive
term power from scsi bus
term power to scsi bus
term power to scsi bus and drive
enable scsi terminator
which one should I use?
Okay, guys, the HW pr0n will have to wait a day or two while I get some stuff in, just don't have energy to start testing it again, have too much to work out for a few days.
Okay, I attempted to boot it today, it worked, but I accidentally put the floppy drive in backwards. After fixing that, then I booted it back up. Success. I installed the PC0 to be able to use DOS formatted floppies, then cold rebooted. It was all back to square one. So, I examined my seagate barracuda SCSI drive. The jumper for enable motor start had fallen off. So, looking online, they don't manufacture the mini jumper it uses anymore. Can anyone confirm that this is the cause, or is it perhaps my jumper wire to repair the track failed? I don't want to have to dismantle it again, all those little hex nuts are a pain.
"Enable motor start" on a seagate drive normally means that, if enabled, it will wait for delay motor start (separate jumper - if activated I think it waits for a multiple of the SCSI ID seconds before powering up)... You don't need it on IIRC.
More worrying, if that's dropped off you've got a bit of plastic and metal in your machine just waiting to short something out.
My bet would be that that wire has fallen off, or the diode has failed. Take it apart, fix it, and get it stable before reassembling it
More worrying, if that's dropped off you've got a bit of plastic and metal in your machine just waiting to short something out.
My bet would be that that wire has fallen off, or the diode has failed. Take it apart, fix it, and get it stable before reassembling it
I got my new fixed multimeter in, and D800 reads 001 (voltage drop reading) and the reading for my bridge is well over 1000, so it works. I started it up with just the PSu connected, got a yellow screen ( daughter card not connected) so connecting daughter card gave me the KS 3.1 insert floppy. So, I connected the SCSI cable I have and with the HDD as device ID 1, I booted it up. Same black screen, no KS insert so either I have a broken OS 3.1 install on that drive, the SCSI cable I have is buggered( checked it for abrasions and cuts, none seen) or the HDD has gone to hell. So, as I wait for my OS 3.1 floppies, I have one question, is the floppy cable's red wire supposed point to the daughter card or the mouse ports?
On A3000 the pin #1 is the one with a square solder joint (all other pins have round solder joints), also (pending on A3k version you have) the SCSI header have the plastic surrounding, which denotes the pin #1 is closest to the daughterboard.
