View source for TC11 DECtape controller

[[Image:TC11DECtapecontroller.jpg|350px|thumb|right|TC11 controller]]

The '''TC11''' is the [[DECtape]] [[device controller]] for the [[UNIBUS]]. It supported, and was normally provided with, [[TU56 DECtape Transport|TU56]] dual DECtape drives. (In theory, it could probably have controlled the earlier [[TU55 DECtape Transport|TU55]] single drive, but this is not confirmed.)

There is only one version of the TC11, the TC11-G (although it is almost never referred to by that full name).

Like many of the earlier large peripheral controllers for the [[PDP-11]], the TC11 was a large custom [[wire-wrap]]ped [[backplane]] which bolted into the front of a 19 inch rack, such as an [[H960]]; into it plugged about 40 small M-Series [[FLIP CHIP]]s.

==Device registers==

{| border=1
! Register !! Abbreviation !! Address
|-
|Control and Status Register    || TCST || 777340
|-
|Command Register               || TCCM || 777342
|-
|Word Count Register            || TCWC || 777344
|-
|Bus Address Register           || TCBA || 777346
|-
|Data Register                  || TCDT || 777350
|}

===777340: Control and Status Register (TCST)===
{{16bit-header}}
| ENDZ || PAR || MTE || ILO || SELE || BLKM || DATAM || NEX || UPS || CLK || MMT || colspan=3 | DT0-2 || colspan=2 | XD17-16
{{16bit-bitout}}

===777342: Command Register (TCCM)===
{{16bit-header}}
| ERROR || Unused || MAINT || DINHB || REV || colspan=3 | Unit || READY || IE || colspan=2 | EXBA || colspan=3 | Function || DO
{{16bit-bitout}}

===777344: Word Count Register (TCWC)===
{{16bit-header}}
| colspan=16 | WC15 <---> WC00
{{16bit-bitout}}

===777346: Bus Address Register (TCBA)===
{{16bit-header}}
| colspan=16 | BA15 <---> BA00
{{16bit-bitout}}

===777350: Data Register (TCDT)===
{{16bit-header}}
| colspan=16 | Data15 <---> Data00
{{16bit-bitout}}

==Board chart/count table==

[[Image:TC11Cards.jpg|350px|thumb|right|TC11 controller cards]]

The Flip Chip module utilization chart for the TC11 backplane is as follows (* = Connector):

{| class="wikitable"
! Slot	!! A !! B !! C !! D
|-
| 1 || colspan="2" style="text-align:center;" | UNIBUS in
|-
| 2 || colspan="2" style="text-align:center;" | UNIBUS out
|-
| 3  || colspan="4" style="text-align:center;" |
|-
| 4 || M798 || M105 || M307 || M141
|-
| 5 || M784 || M7821 || G736 || M307
|-
| 6 || M784 || M796 || M111 || M113
|-
| 7 || colspan="2" style="text-align:center;" | M795 || M113 || M203
|-
| 8 || M783 || M783 || M115 || M113
|-
| 9 || M149 || M149 || M115 || M602
|-
| 10 || M302 || M307 || M627 || M302
|-
| 11 || M206 || M205 || M611 || M307
|-
| 12 || M239 || M112 || M161 || M111
|-
| 13 || M113 || M113 || M127 || M112
|-
| 14 || M205 || M205 || M206 || M115
|-
| 15 || M121 || M121 || M207 || M119
|-
| 16 || M205 || M205 || M121 || M111
|-
| 17 || M121 || M121 || M113 || M117
|-
| 18 || M161 || G879 || colspan="2" style="text-align:center;" | M228
|-
| 19 || M611 || M502 || M115 || M205
|-
| 20 || M908* || G888 || M117 || M113
|-
| 21 || G888 || G888 || M115 || M113
|-
| 22 || colspan="2" style="text-align:center;" | W032* || M202 || M112
|-
| 23 || G888 || G888 || M117 || M606
|-
| 24 ||  || M050 || M904*
|}

* The M908 is the command connector
* The W032 is the analog [[signal]] connector
* The M904 is the light cable

===Module counts===

Module counts (drawn from the module count chart, not yet confirmed in the module utilization drawing):

Single height boards:

* 1 - G736 - Jumper module
* 1 - G879 - Transport detector
* 5 - G888 - Manchester read/write amplifier

* 1 - M050 - Inverter Driver
* 3 - M111 - Inverters
* 3 - M112 - NOR Gates
* 8 - M113 - 2-Input NAND Gates
* 5 - M115 - 3-Input NAND Gates
* 3 - M117 - 4-Input NAND Gates
* 1 - M119 - 8-Input NAND Gates
* 5 - M121 - 4-input AND-NOR Gates
* 1 - M127 - 2-2-2-3 AND-NOR Gates
* 1 - M141 - 2-2-2-2 AND-NOR gates
* 2 - M149 - 2-Input NAND Wired OR
* 2 - M161 - Binary to Octal/Decimal Decoder
* 1 - M202 - J-K Flip Flops
* 1 - M203 - S-R Flip Flops
* 6 - M205 - D Flip Flop
* 2 - M206 - D Flip-Flops
* 1 - M207 - J-K Flip-Flops
* 1 - M239 - 4 Bit Counter/Registers
* 2 - M302 - One Shot Delay
* 4 - M307 - Integrating One Shot
* 1 - M502 - Negative Input Converter
* 1 - M602 - Pulse Amplifier
* 1 - M606 - Pulse Generator
* 2 - M611 - High Speed Power Inverter
* 1 - M627 - 4-Input NAND Power Amplifier

Extended single height boards:
 
* 1 - [[M105 Address Selector|M105]] - UNIBUS Address Selector
* 1 - [[M782 Interrupt Control|M7821]] - UNIBUS Interrupt Control, 7 bits
* 2 - M783 - Bus Drivers
* 2 - M784 - Bus Receivers
* 1 - M796 - UNIBUS Master Control
* 1 - M798 - Non-inverting UNIBUS Drivers

Double height boards:

* 1 - M228 - Mark Track Decoder

Extended double height boards:

* 1 - M795 - Word Count and Current Memory Address

==External links==

* [http://www.bitsavers.org/pdf/dec/dectape/tc11/TC11_Mantenance_Manual.pdf TC11 DECtape system manual] (DEC-11-HTCB-D)
* [http://www.bitsavers.org/pdf/dec/dectape/tc11/TC11_Engineering_Drawings.pdf TC11 DECtape system engineering drawings] (DEC-11-HTCA-D)
* [https://www.pdp-11.nl/peripherals/tape/tu56-info.html TC11 controller]

[[Category: UNIBUS Storage Controllers]]
[[Category: DECtape]]