P7001: Difference between revisions

|discontinued=1981

|summary=Digitizer for the 7704A oscilloscope

|manuals=

* [[Media:070-1599-00.pdf                          | P7001 Operators Manual]]

* [[Media:070-2623-00.pdf                          | P7001 IEEE 488 (GPIB) Interface]] (1986, OCR)

* [[Media:P7001 Calculator Aided Measurements.pdf  | P7001 / 31 Calculator Aided Measurements]]

''Missing, please upload:''

* [[Media:061-1344-00.pdf | Hardware Signal Averager (HSA) Manual 061-1344-00]]  

* [[Media:070-2846-00.pdf | Hardware Signal Averager (HSA) Manual 070-2846-00]]

{{ROM Images}}

{{Spec | Single-shot performance | 500 μs/Div }}

{{Spec | External interface      | 16 bit parallel, proprietary "[[CP bus]]" (dual 37-pin [[Sub-D connector]]s) interfacing with Tektronix CP-1100 or CP-4100 series controllers; other interfaces available }}

{{Spec | Dimensions              | 12" (30.6 cm) W × 18.9" (47.5 cm) H × 22.7" (57.7 cm) D }}

{{Spec | Weight                  | 48 lbs (21.8 kg) without plugins }}

==Links==

* [https://vintagetek.org/p7001/ P7001 history] @ VintageTek.org

* [https://groups.io/g/TekScopes/topic/7654269 Thread on P7001 and interfaces]

* [https://aei.pitt.edu/83031/1/1974.11.pdf CAMAC bulletin, Nov 1974] with a description of the [[CAMAC]] interface for Tektronix digitizers

* [[Patent US 4225940A|United States Patent 4225940A Oscilloscope system for acquiring, processing, and displaying information]]

* [[Patent US 3824382A|United States Patent 3824382A Vector Generator]]

==Internals==

The P7001 has its own power supply built into it, independent of the power supply in the acquisition unit of the 7704A.   

===Asynchronus Bus===

| DPO to Data General Nova

| [[021-0113-00]]

|-

| DPO to APD ([[CP Bus]])

| [[021-0116-00]]

|-

| DPO to CP1100 ([[CP Bus]])

| [[021-0117-00]]

|-

| DPO to [[31|TEK31]] calculator

| [[021-0127-00]]

|-

| DPO to [[CAMAC]]

| [[021-0146-00]]

|-

| DPO to [[4010|4010 Family]]

| [[021-0175-00]]

|-

| DPO to [[GPIB_interface|GPIB]]

| [[021-0206-00]]

|}

</gallery>

[[File:Tek_P7001_Designteam.jpg|thumb|650px|right|Key design Team of the P7001 ''(click to enlarge)'']]

'''Development'''

At least 3 different Scope-Mobile Carts were designed in order to be able to move the DPO with the attached minicomputer around. The [[202|202D]] and the 202R were introduced together with the P7001 in 1973 and the [[Model 7|Model 7 Rack Cart]] was officially released in 1977.

<gallery>

Tek_scopecart_202d_dim.jpg|Dimensions of Scopecart 202D

TEK_202R_front.jpg|Scopecart 202R front side

| 31

| Add IEEE 488 Bus Interface

| +$2000

|-

| 32

| Add CP Bus Interface

| +$475

|-

Descriptions of the Readout Interface Status Register and data format can be seen in the images above. There is also an overview of the P7001 Address Map.

While the data bus of the P7001 is 16 bit wide, most of the stored data is only 10 bit wide. More importantly, bit 0 of the needed data word is not always aligned to bit 0 of the data bus. A very good example of this design is the data format of the Readout Interface. Bit 0 of the readout information starts at bit 5 on the data bus. To get or write the readout information we have to shift and crop or expand the data bits.

The final program might look like:

SEND ("ADR 3456", "OCT 004400") // 'H' -> ASCII 72 -> 0000100100000000 -> 004400

SEND ("ADR 3457", "OCT 004240") // 'E' -> ASCII 69 -> 0000100010100000 -> 004240

</nowiki>

Most of the time we're dealing with 10 bit data information. To make life easier, Tektronix implemented the "WRD" instruction set on the controller. This instruction set handles the data conversion between the ASCII data and the 16 bit universe of the P7001. The command also implements an auto-increment for the address data.

The new program looks like:

SEND ("ADR 3456" , "WRD 72") //'H'

SEND ("WRD 69") //E  -> the destination address is auto-incremented

</nowiki>

Finally, there is a high-level command implemented which sends the readout data in one line:

SEND ("ADR 3456", "SCL HELLO ") // The last space is needed as terminator character.

SEND ("ADR 7296", "OCT 040100") // Show Message field 2 / Location D on CRT

Tek_P7001_Controller_XY_Mode.jpg

</gallery>

A description of the Display Generator Status Register and Data Format can be seen in the images above.  

The resulting program in pseudo-code:

SEND ("ADR 7168", "OCT 020100") //enable X-Y Mode for Waveform "D"

===Field of Application===

<gallery>

RCA_Engineer_1980-04-05-06.pdf|Competitive Product Analysis with the P7001 at RCA

</gallery>

* [[Media:Tekscope 1973 V5 N2 Mar 1973.pdf  | TekScope Vol. 5 No. 2, Mar-Apr 1973 about the introduction of the P7001]]

[[Category:7000 series scopes]]