View source for TM02 magtape controller

The '''TM02''' [[magnetic tape controller|magtape formatter]] is a [[MASSBUS]] device controller, used with 1/2" [[magnetic tape drive]]s; supported drives include the [[TU16 magtape drive|TU16]] and [[TE16 magtape drive|TE16]] (both at 45 inches per second). It can handle 800 bits/inch ([[NRZI]]) and 1600 bits/inch (PE - Phase Encoded).

A TM02 can control up to 8 drives, although the TM02 and drives count as only a single MASSBUS device. The TM02 controller connects to all the drives over a 'slave bus'; all the drives are identical (unlike in the [[TM11 magtape controller|TM11]]/[[TU10 magtape drive|TU10]] system.

The TU16/TM02 with an [[RH11 MASSBUS controller|RH11]] MASSBUS interface is denominated as a '''TJU16'''; with the [[RH70 MASSBUS controller|RH70]] MASSBUS interface of the [[PDP-11/70]], it is denominated as a '''TWU16'''.

==Implementation==

The TM02 is implemented as a set of boards, all of which plug into a custom [[DEC card form factor|hex]]-high nine-slot [[backplane]], usually mounted in a special box in the first tape drive rack. The modules include two hex-size boards, seven quad-size modules, and six dual-high modules.

The hex modules are:

* M8909 - MASSBUS Interface
* Bit Fiddler
** M8906 for use with a PDP-11
** M8914 for use with a PDP-10

The quad modules are:

* 3 x M8901 - Data Sync (PE)
* M8902 - Tape Control (PE)
* M8903 - Tape Control Common Mode
* M8904 - Tape Control (NRZI)
* M8905 - Maintenance Register

The dual modules are:

* M8907 - Control and Write Drivers
* M8908-YA
* M8908
* 3 x M5903 or M5903-YA

The first three are the drive slave bus interface; the last three are the MASSBUS interface.

==Drive bus==

''To be added.''

==See also==

* [[TM03 magtape controller]]

==External links==
 
* [http://www.bitsavers.org/pdf/dec/magtape/tu16/EK-TJU16-MM-002_TJU16_Magnetic_Tape_Subsystem_Maintenance_Manual_Apr75.pdf EK-TJU16-MM-002 TJU16 magnetic tape subsystem maintenance manual] - covers the TM02 in detail
* [http://www.bitsavers.org/pdf/dec/magtape/tu16/EK-TWU16-MM-001_TWU16_Magnetic_Tape_Subsystem_Maintenance_Manual_Dec75.pdf EK-TWU16-MM-001 TWU16 magnetic tape subsystem maintenance manual] - ditto

[[Category: MASSBUS Devices]]