View source for PC04/PC05 High-Speed Paper-Tape Reader/Punch

The '''PC04''' and '''PC05 Paper-Tape Reader/Punches''' are the [[Digital Equipment Corporation|DEC]]-supplied [[paper tape]] [[peripheral]]s for the [[PDP-8]] and [[PDP-11]] respectively. The '04 was also used by early [[PDP-10]] models, and '05 by the [[PDP-12]] and [[PDP-15]].

The mechanical portions are the same in the '04 and '05 types, but they differ in the control [[electronic]]s in them. Both types include an electro-mechanical punch (a Roytron Model 400, modified by DEC), and a photo-electric reader (manufactured by DEC), which are completely separate, but housed in the same frame, and share a [[power supply]].

There are also reader-only and punch-only models: the reader-punch model of the PC04 is the '''PC04B''', the reader-only model is the '''PR04R''', and the punch-only model is the '''PC04P'''; the reader-punch model of the PC05 is the '''PC05C''', the reader-only model is the '''PR05R''', and the punch-only model is the '''PC05P'''.

All the models listed above come in 50Hz and 60Hz versions (which are identical except for the punch pulley; so there are no separate 50Hz versions of the reader-only models).

There is also a [[backplane]] to hold the control electronics, which are a number of [[FLIP CHIP]]s. The backplane in the PC04 has 8 slots; that in the PC05 has 12 slots. (In addition, there is also a [[device controller|controller]] in the computer.)

==Versions==

There are a myriad of different versions, in addition to the variants above, particularly in the '04.

To start with, there are two generations of each type: in the earlier, input data is strobed during reading by a signal from the stepper motor; the later strobes the data by sensing the feed holes.

There are also different versions of the PC04 for different PDP-8 models (they differ as to which FLIP CHIPs are used, as per the tables below):

* PC04-B, PC04-C - PDP-8, PDP-8/S (also the [[KA10]])
* PC04-BB - PDP-8/I 
* PC04-BL - PDP-8/E, PDP-8/F, PDP-8/L, PDP-8/M

along with equivalent versions of the punch-only and reader-only models.

(There is disagreement between the May 1973 revision of the manual, DEC-00-PC0A-D, and the April 1972 revision of the engineering drawings as to the version numbers. The ones above are from the drawings, which also do not show a punch-only model for the -8/I, with the reader-only version for that being the PC04-RB; the manual claims the -8/I reader-only and punch-only versions are the PC04-R and PC04-P, which the prints list as being for the -8 and -8/S.)

There is also a special version of the reader/punch model for the [[KI10]], the PC04-CL. (The 50Hz versions of all of these differ in the last letter, which is incremented; e.g. the KI10 50Hz version is the -CM.)

The control switch array on the front panel differs between the reader-punch, reader-only, and punch-only versions; the PDP-10 versions have their own switch array formats.

==Cables==

The cable arrangements for the '04 and '05 are almost as complicated as the model/version situation!

All have a [[DEC card form factor|single-width]] [[printed circuit board|PCB]] with plated contact fingers at one end, to plug into the backplane in the PC04/05; the connector on the other end varies, depending on what it goes to.

===PC04===

The early PDP-8 models use cables with a PCB on both ends, and the PDP-8 end plugs into a slot on its backplane. The -8/E uses BC08K cables, which have an M955 PCB on the PC04 end, and a 40-pin male-shell [[Berg connector]] on the other end, which goes into an M840 plugged into the [[OMNIBUS]].

This is the pinout of the BC08K:

{| class="wikitable"
! Berg !! PCB
|-
| D || A2
|-
| F || B2
|-
| J || C2
|-
| L || D2
|-
| N || E2
|-
| R || F2
|-
| T || H2
|-
| V || J2
|-
| X || K2
|-
| Z || L2
|-
| BB || M2
|-
| DD || N2
|-
| FF || P2
|-
| JJ || R2
|-
| LL || S2
|-
| NN || T2
|-
| RR || U2
|-
| TT || V2
|}

Pins of the Berg connector which aren't listed in the table are connected to [[ground]].

===PC05===

There are two difference versions of the [[PC11]] controller, and they use different cables. The early version uses BC08F cables, with a right-angle PCB on the other end, which plugs into a connector on the side of the M781 card. The later version uses BC08Js, which have an M953 on the PC05 end, and a 40-pin male-shell Berg connector on the end which goes into the M7810.

'''Note:''' The BC08J looks identical to the BC08K used with the PC04, but they have a different pinout. This is the pinout of the BC08J:

{| class="wikitable"
! Berg !! PCB
|-
| D || B1
|-
| F || D2
|-
| J || D1
|-
| L || E2
|-
| N || E1
|-
| R || H2
|-
| T || H1
|-
| V || K2
|-
| X || J1
|-
| Z || M2
|-
| BB || L1
|-
| DD || P2
|-
| FF || M1
|-
| JJ || S2
|-
| LL || P1
|-
| NN || T2
|-
| RR || S1
|-
| TT || V2
|}

Similarly to the BC08K, pins of both the Berg connector and the PCB which aren't listed in the table are connected to [[ground]].

==Electronics==

The tables below show the FLIP CHIPs used in each version; the location of boards which end cables, and are plugged into the backplane to carry signals to/from the backplane, are also shown. Cards/cables used for the punch are shown in ''italics''; the others are for the reader. Reader-only and punch-only models will have only the associated cards/cables.

===PC04===

PC04-B:

{| class="wikitable"
! Slot !! B !! A
|-
| 1 || ''W077 Punch control cable'' || W077 Reader control cable 
|-
| 2 || ''W023 Punch assembly cable'' || &nbsp;
|-
| 3 || W040 Solenoid driver || &nbsp;
|-
| 4 || W040 Solenoid driver || &nbsp;
|-
| 5 || W040 Solenoid driver || &nbsp;
|-
| 6 || W040 Solenoid driver || W512 Positive Level converter
|-
| 7 || colspan="2" style="text-align:center;" | G918 Photo amplifier 
|-
| 8 || W077 Reader photocell cable || W512 Positive Level converter
|}

PC04-BB:

{| class="wikitable"
! Slot !! B !! A
|-
| 1 || ''W077 Punch control cable'' || &nbsp;
|-
| 2 || ''W023 Punch assembly cable'' || W077 Reader control cable
|-
| 3 || M040 Solenoid driver || &nbsp;
|-
| 4 || M040 Solenoid driver || &nbsp;
|-
| 5 || M040 Solenoid driver || &nbsp;
|-
| 6 || M040 Solenoid driver || &nbsp;
|-
| 7 || colspan="2" style="text-align:center;" | G918 Photo amplifier 
|-
| 8 || W077 Reader photocell cable || &nbsp;
|}

PC04-BL:

{| class="wikitable"
! Slot !! B !! A
|-
| 1 || ''W033 Punch control cable'' || W033 Reader control cable
|-
| 2 || ''W023 Punch assembly cable'' || &nbsp;
|-
| 3 || M040 Solenoid driver || ''M044 Solenoid driver'' 
|-
| 4 || M040 Solenoid driver || ''M044 Solenoid driver'' 
|-
| 5 || M040 Solenoid driver || ''M044 Solenoid driver'' 
|-
| 6 || M040 Solenoid driver || ''M113 Ten 2-input NAND gates''
|-
| 7 || colspan="2" style="text-align:center;" | G918 Photo amplifier 
|-
| 8 || W077 Reader photocell cable || &nbsp;
|}

===PC05===

{| class="wikitable"
! Slot !! B !! A
|-
| 1 || &nbsp; || &nbsp;
|-
| 2 || &nbsp; || &nbsp;
|-
| 3 || colspan="2" style="text-align:center;" | M715 Reader clock
|-
| 4 || colspan="2" style="text-align:center;" | M705 Reader control
|-
| 5 || colspan="2" style="text-align:center;" | ''M710 Punch control''
|-
| 6 || ''W023 Punch assembly cable'' || ''M044 Solenoid driver''
|-
| 7 || M040 Solenoid driver || ''M044 Solenoid driver'' 
|-
| 8 || M040 Solenoid driver || ''M044 Solenoid driver'' 
|-
| 9 || M903 Reader control cable || M040 Solenoid driver 
|-
| 10 || ''M903 Punch control cable'' || M040 Solenoid driver 
|-
| 11 || colspan="2" style="text-align:center;" | G918 Photo amplifier 
|-
| 12 || W077 Reader photocell cable || K303 Timer
|}

The M705 Reader control card was later replaced by the M7050; the K303 was not included when later revisions of the M710 Punch control card were used.

==External links==

* [http://retrocmp.com/stories/dec-pc05-papertape Love affair with the DEC paper tape PC05]
** [http://retrocmp.com/stories/dec-pc05-papertape/239-dec-pc05-paper-tape-reader-puncher DEC PC05 paper tape reader/puncher]
** [http://retrocmp.com/stories/dec-pc05-papertape/240-dec-pc05-model-evolution DEC PC05 - Model evolution]
** [http://retrocmp.com/stories/dec-pc05-papertape/241-dec-pc05-failures DEC PC05 - Failures]