Re: Model I - Teac FD55E & FD55F Drive Jumper Settings
Knut
> On Aug 23, 12:59 pm, Fooser<don.man...@gmail.com> wrote:
>> Howdy All.
>>
>> In an effort to get a Model I to boot, I purchased two [new] drives.
>> A Teac FD55E DSDD, and a Teac FD55F DSQD drive (80 track).
>>
>> First the, FD55E boot drive. Currently it is the only floppy drive on
>> a [no twisted, no pins removed] cable. Drive 0, terminated. I'm not
>> entirely sure what else should be jumpered. :(
>>
>> I turn on the drive, ei, then cpu. Get a screen full of garbage. I
>> put the floppy in the drive, and reset the cpu. The drive turns but
>> Newdos 80 2.0 for Model I (mailed from IRA) does not boot, and screen
>> still full of garbage. I have Model I LDOS, TRS-DOS as well, none
>> boot.
>>
>> I think it might be a jumper setting. Does anyone have this drive
>> Teac FD55E (or FD55F for that matter) configured correctly that would
>> like to share?
>>
>> Many Thanks!
>>
>> -Don Mankin
>
> More... found these jumper settings: HS, SM, HL,& PM strapped, all
> others open. I configured the FD55E and FD55F the same, except for
> DS0 for the E, and DS1 for the F. The behavior is as stated above...
> FD55E boot DRV0 spins, lights up, then stops. Garbage on the screen.
> I did a POKE 14304,1 and drive lights and spins briefly. The docs
> for PM say the drive should spin when I insert a diskette into it. It
> doesn't. Oh, the behavior is the same whether I use an LNW (no
> doubler) or Radio Shack (aerocomp doubler) expansion interface.
>
> Any ideas anyone? Thanks!
Hi
http://minus-zero.net/mirrors/bitsavers.org/pdf/teac/FD55_Spec.pdf
According to this document it seems those jumpers, as they are, not the factory
setting
http://nemesis.lonestar.org/computers/tandy/hardware/model16_6000/floppyfix.html
some comments about jumpersettings for TRS-80 there but since model 16 is quite
different from model I it might not apply.
Many of the straps have to do with "head load" and the TRS-80 doesn't provide
any head load (or in use) signal (pin 4) so head load needs to be autonmatic or
based on DSx signal.
I don't have this precise drive but I have an FD55GFR which I could not get to
work (it is a 1.2MB drive).
Note SD/DD is a controller feature not a drive feature SD uses FM coding while
DD uses MFM so to the drive there are about as many transitions on a track with
SD and DD. HD (1.2MB) is another matter which is selected by pin 2.
This group is pretty dead and most TRS-80 traffic now goes on
http://groups.yahoo.com/group/TRS-80/
you might find someone there that is using such a drive.
Knut
Rainer Fredrich
beside the TEAC docs on bitsavers.org (or mirrors thereof):
http://www.bitsavers.org/pdf/teac/
I have two more TEAC FD-55 E F manuals:
TEAC_FD55_A_B_E_F_G_Spec.pdf
http://www.mediafire.com/?95qy9b05jy71x5c
Teac_FD55-E_FD55-F_Drive_Spec_(1981).pdf
http://www.mediafire.com/?gb9a8fpgnz1gym4
Hope these manuals provide you with additional information.
Rainer