Toshiba XM 3401B Jumpers
Durval Pereira de Menezes Jr.
I just received a Toshiba XM3401B SCSI CD-ROM drive without *any*
documentation, and it would be really nice to be able to use it now
instead of waiting for the local reseller to order the documentation set
(here in Brazil this kind of thing can take weeks).
So, is there anybody around who would be so kind as to tell me how to
configure the jumpers on the back of the drive?
Thanks in advance,
--
Durval Menezes (dur...@rivendel.lin.ufrj.br)
Chernyi Eugene
: Hello fellow netters,
: I just received a Toshiba XM3401B SCSI CD-ROM drive without *any*
: documentation, and it would be really nice to be able to use it now
: instead of waiting for the local reseller to order the documentation set
: (here in Brazil this kind of thing can take weeks).
: So, is there anybody around who would be so kind as to tell me how to
: configure the jumpers on the back of the drive?
: Thanks in advance,
Look at your drive from behind. First three jumpers (from left) is your
SCSI address. Last jumper is termination (ON- enabled). Jumpers 6 & 5
leave off. Jumper 4, if I'm not mistaken, is Parity enabled (ON).
Try it. I have the same drive, but have no any documentation with me at
the moment. If you want to know EXACTLY what numbers 5 & 6 mean, wait
for tomorrow, I'll send you full explanation.
Bye
.
: --
: Durval Menezes (dur...@rivendel.lin.ufrj.br)
Peter Hayward
At the rear of the drive is an 8 position jumper block. The block is
'polarised' into a block of 4 and block of 3 by a pair of missing
pins.
Function with the jumper inserted
ID1
ID2
ID4
Parity Enable
Missing Pins
Prevent Media Removal (Eject button ignored)
Test - Play audio CD to audio ouput
Terminator Power Supplied
There are also a pair of track cut/jumper pads for changing default
block size i.e. SUN vs PC. Default is PC
--
Peter Hayward, Cambridge, UK | Life is symetrical about 42
pe...@cdsl.demon.co.uk, tel +44-1223-312-923 | and I'm on the downside.
Leonard Will
the Toshiba XM3501B jumper settings, etc., especially those who took time
to copy out sections from their manuals. Internet is wonderful - what a lot
of helpful people there are out there!
My suppliers have now sent me a photocopy of a 15 page manual for this
drive (I still don't know why it isn't supplied automatically).
This gives one or two details which have not been covered fully in the
messages so far, which may be helpful to anyone else:
1. The external drive has a bank of switches which exactly match the
jumpers we have been discussing.
2. "The parity switch, number 4, should be set to OFF for use with most
controller cards, but check the documentation with your controller card to
check that this is the case. When this switch is set to OFF the parity of
output data is not checked. When this switch is set to ON the output data
is checked for parity and the parity bit is issued"
(This sounds to me as though the switch is controlling the parity generated
by the drive, though it is ambiguous as to which direction they mean by
"output".)
3. The eject suppression switch, no. 6: "If this switch is set to ON the
EJECT button will not operate. The drive then expects all control,
including the ability to eject the caddy, to come from the computer."
(I don't know what signal the computer sends, but software eject works by
clicking the eject button on the MS Media Player window, or by using the
FDEJECT command which came on the Future Domain software disc.)
4. The TEST switch/jumper. The manual does not say anything about what this
does, except that it should always be set to OFF.
5. "The headphones socket . . . can also be used to connect the CD-ROM
drive to other equipment. For example, . . . an audio amplifier or a
cassette recorder."
6. "The audio output terminals can be used to connect . . . to the auxiliary
input terminals on an audio amplifier. Such a connection does not affect
the use of the headphones socket on the front of the drive."
(The manual says that the audio output terminals are on external drives
only. I don't know if they are connected directly to the miniature
audio-out connector on the back of the drive, but I guess they probably
are.)
7. The volume control controls the headphones socket, not the audio output
at the rear.
8. There is an emergency manual disk eject function, e.g. for use in power
failure. Remove the screw above the volume control and "insert a pointed
instrument".
9. The headphone output level is 0.75 V rms typical (load = 100 ohm)
(Andrew Gabriel said that it was 0.9 V rms, but that was for the 3401. Not
significant, I guess.)
I now have music and pictures and am very happy. Thanks again to all.
Leonard
--
Dr Leonard D Will Tel: +44 181 366 7386
Information Management Consultant Fax: +44 181 366 0916
27 Calshot Way, ENFIELD, Middlesex Email: LW...@willpowr.demon.co.uk
EN2 7BQ, United Kingdom
Peter Hayward
LW...@willpowr.demon.co.uk "Leonard Will" writes:
| Thanks very much to everyone who responded with helpful information about
| the Toshiba XM3501B jumper settings, etc., especially those who took time
| to copy out sections from their manuals.
|
| 2. "The parity switch, number 4, should be set to OFF for use with most
| controller cards, but check the documentation with your controller card to
| check that this is the case. When this switch is set to OFF the parity of
| output data is not checked. When this switch is set to ON the output data
| is checked for parity and the parity bit is issued"
|
| (This sounds to me as though the switch is controlling the parity generated
| by the drive, though it is ambiguous as to which direction they mean by
| "output".)
|
Wrong on both counts. I would _never_ disable parity unless I had
proof that my system failed when it was enabled. Even then I think I
would throw away the offending (non-parity) device and buy a decent
new one. I believe that the SCSI standard demands that all devices
generate parity. At SCSI-1 checking was optional, at SCSI-2 I think
it has been made mandatory.
'Output' means 'from the host adaptor'/'to the drive'. The drive only
checks parity on data it recieves. Once you realise the jumper is to
enable checking the direction becomes unambiguous.
If a device detects a parity error then the normal SCSI procedure
would be to go to the message phase, send an appropriate message like
restore data pointers/modify data pointers and retry the transfer.
If that was not possible for some reason a SCSI check condition would
be generated with a suitable sense key (e.g. 0x04h hardware eror,
0x08h aborted command) with additional info in the ASC/ASQ fields,
e.g. 47/00 SCSI parity error.
| 3. The eject suppression switch, no. 6: "If this switch is set to ON the
| EJECT button will not operate. The drive then expects all control,
| including the ability to eject the caddy, to come from the computer."
|
Over and above this jumper there are SCSI commands to PREVENT/ENABLE
media removal and commands to LOAD/UNLOAD the media. SCSI commands
are 'packets' of data that pass over the SCSI bus using the normal
fairly complex handshake rules of SCSI. They are not indiviual
signals (wires).
The jumper and the PREVENT media removal command both over-ride (stop
you using) the front panel switch. This is a general SCSI feature. I
would expect it's main use would be to prevent 'operator error' while
doing something like a tape backup in a large shop. An operator
could easily try to remove a tape from the wrong unit (of many) while
it was near the end of if an 'n' hour backup.
I have used this feature with MO drives on big systems. The
operators were so used to Winchester disks that they were fogetting
to unmount the MO pack; they simply ejected it and then wondered why
it had a corrupt file system on it! I wrote the equivalent of a
super-user command to unmount and eject the cartridge in one
interlocked operation.