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DIGITAL-7-60-N

April 1965

25 pages

Original

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Document:	Type34DisplayTest
Order Number:	DIGITAL-7-60-N
Revision:
Pages:	25
Original Filename:	http://bitsavers.org/pdf/dec/pdp7/DIGITAL-7-60-N_Type34DisplayTest_Apr65.pdf

OCR Text

1•

IDENTIFICATION

1 •1

Digital-7-60-N

1 .2

Type 34 Display Test

1 .3

April 28, 1965

PDP

II BRAAY

Digiral-7-60-N
Page 2

ABSTRACT

The test program causes a variety of patterns to be displayed on the Type 34 CRT
to aid an operator's efforts to maintain and align the display. With one exception, the operator
is able, by means of the switch register, to go from pattern to pattern spec ifying parameters
without having to restart the program.

REQUIREMENTS

3. 1

Storage
The program occupies 1051

8 registers; locations 1, 100-144, and 200-1232.

3.2

Subprograms a'nd/or Subroutines (Not Appl icable)

3.3

Equ ipment
Standard PDP-4/7. Type 34 Oscilloscope Display. Type 370 Light Pen optional.

(

3.4

Miscellaneous (Not Applicable)

USAGE

4. 1

4. 1 • 1

Set the address switches to the starting address (17770 or 7770) of the RIM Loader.

4. 1 .2

Place the binary program tape in the reader.

4. 1 .3

Press START.

4.2

Calling Sequence (Not Applicable)

4.3

Switch Settings

4.3.1
ACS bits 0-2 select the pattern to be displayed according to tb' Dctal number
contained in them as follows: {individual routines are explained in Section 6.}

o
1
2
3
4
5
6
7

{

Blank screen; no operation.
Vertica I line.
Horizontal line.
Diagonal line.
Horizontal segmented sweep.
Vertical segmented sweep.
Blank screen; no operation.
Blank screen; no operation.

The only pattern not selectable by these switches is the axial point plotter,
which is separate from the others and must be entered by manually starting at address 100.

PDP

Digital-7-60-N
Page 3

4.3.2

Axial Point Plotter

Starting at address 100 causes the progr9m to immediately halt so that the following settings can be made before pressing CONTI NUE:
ACS bit 0 = 1 to plot on X-axis from coordinate in ACS bits 8-17.
ACS bit 0 = 0 to plot on Y-axis from coordinate in ACS bits 8-17.
Changes inACS bits 8-17 may be made while program is displaying, with immediate results.
4.3.3

Horizontal and Vertical Segmented Sweep Patterns

ACS bits 9-17 select the segments of the CRT face to be illuminated by the
chosen sweep pattern.

4.3.4

Bit a 1

Selects Segment Number
(see diagram 11 .1)

17
16

1
2

15
14
13
12
11

3
4
5

6
7

Light Pen Pattern
The letter P appears on the screen when ACS 0 - 17 = o.

4.4

Start Up and/or Entry

4.4. 1

Preliminary Procedures
Initial settings of 34 Display controls:
1.
2.
3.
4.
5.
6.
7.
8.

Vertical sensitivity
Horizontal sensitivity
Sensitivity verniers
Horizontal display
Vertical input switch
Horizontal input switch
Sweep time/cm
Trigger controls

1v/cm
1 v/cm
Adiust to suit*
Horizontal amp only
DC
Any
Any
Any

Lt BRARY

Digital-7-60-N
Page 4

.9. Position controls
10. Focus
11. Intensity

Approximately 12 o·clock*
Adjust to suit***
Adiust to suit**

Set the switch register to the desired initial operating conditions before
entering the program.
4.4.2

Entry
For axial plotting, set the address switches at 100. For all other patterns,
set the address switches at 200. Press START.

4.4.3

Restart

Restarting is normally unnecessary as provisions have been made to transfer
from pattern to pattern while the program is in progress by mere Iy changing the setting of
ACSO-2, the only exception being the manual transfer to or from the axial plotting mode.
4.5

4.6

Errors in Usage
Address

Comments

100

Not an error halt. Occurs to allow operator time to set initial conditions for Axial
Plot Program.

730

DCF has failed to clear Display flag, or
DSF a Iways skips.

734

Display flag has fai led to cause an interrupt.

Recovery from Such Errors
Address

Comments

100

Set initial conditions into ACS (4.3) and
press CONTINUE.

730

No recovery. Program must be restarted.

734

Press CONTINUE to resume program.

*The exact setting of sensitivity and position controls should be such that the patterns produced
by the program fill the CRT reticle entirely. The horizontal, vertical, and diagonal line pat ...
terns are programmed to pass through the center of the CRT and bare Iy touch the extremities of
the retic Ie grid.
**The intensity shou Id be adjusted so that the unintensified beam just disappears from view.
*** It· may be desirable, when using the sweep patterns to check the continuity of the phosphor
coating, to defocus the beam and increase the intensity. Be sure to return the intensity to its
former leve I.

PDP

LIBRARY'

Digital-7-60-N
Page 5

RESTRICTIONS (Not Applicable)

DESCRIPTION

6. 1

Discussion

6. 1 • 1

Axial Plotting Mode

This program beginning at address 100 immediately executes a HlT instruction
to allow the operator time to set up the AC switches for desired initial conditions. Upon continuing, these switches are examined. Program control branches to either an X-plot routine
or a Y-plot routine (PlOX or PLOY) depending upon the polarity of ACS O. Each routine
loads its "active" coordinate register with the coordinate in ACS 8-17 and clears the other
coordinate register. The point so referenced is then displayed and control is returned to the
beginning of the program.

6. 1 .2

(

Dispatch

The dispatch routine (BEG) is entered at address 200. SR bits 0-2 are examined
and program control is transferred to the subroutine responsible for the display of the pattern
named by the number in these switches. If this number is 0 and all other ACS are 0 as well,
control is transferred to the Light Pen subroutine. Return from all pattern subroutines except
the light Pen subroutine is accomplished automatically at the termination of a single pattern
display or when all switch conditions have been met (segmented sweep). The Light Pen subroutine re I inqu ishes program control only when the AC S register becomes nonzero. The return
from pattern subroutines is to the dispatch routine where the same pattern subroutine is entered
without a noticeable break if SR bits 0-2 are unchanged. A change in these bits causes a new
subroutine to be entered and a new pattern displayed.

6. 1 .3

Vertica I Li ne Subroutine (VLT)

This subroutine plots all points having an X-coordinate of 1000, beginning
with X = 1000, Y = a and ending with X = 1000, and Y = 1777. After plotting the last point,
the dispatch routine is reentered. The line displayed bisects the center.
6.1 .4

Horizontal Line Subroutine (HTS)

This subroutine plots all points having a V-coordinate of 1000, beginning with
X = 0, Y = 1000 and ending with X = 1777, Y = 1000. After plotting the last point, the dispatch routine is reentered. The Iine displayed bisects the center.
6.1.5

Diagonal Line Subroutine (DlT)

This subroutine plots all points having equal X- and V-coordinates, beginning
with X = 0, Y = a and ending with X = 1777, Y = 1777. After plotting the last point, the dispatch routine is reentered. The Iine displayed bisects the center.

PDP

LIBRARY

Digital-7-60-N
Page 6
6. 1 .6

Common Line Pattern Subroutine (COM)

This subroutine is common to VLT, HTS, and DLT and accomplishes the actual
incrementation of the coordinates and dec ides whether or not the pattern is complete.

6. 1 .7

Segmented Sweep Routines

6.1.7.1

General

The Segmented Sweep Routines provide a means of checking the uniformity of
the phosphor coating on the CRT. In order to facil itate checking, the CRT reticle is divided
into nine overlapping segments, (see diagram 11 .1). Vertical or horizontal lines are swept
over a segment several times causing the phosphor to remain illuminated. The SR bits 9-17
specify which segments are to be swept. If more than one switch is "on, II the segments are illuminated in order. The sweep routines can also be used to check for AC ripple and decoder
network defic ienc ies. The line which sweeps a segment conta ins every fourth point only.
Thus, individual points are visible and the wake of the sweep has a ribbed appearance. Uneven trace spac ing indicates improper adiustment of the decoder network. If the I ine appears
wavy, ripple is present somewhere in the display circuitry. These conditions may be present
concurrently. The sweep routines use a set of subroutines to do the actual sweeping. Description of these subroutines follow the description of the swe~p routines.
(

6. 1.7.2

Horizonta I Segment Sweep Routine (HST)

The Horizonta I Segment Sweep Routine first initial izes the segment counter to
segment 1. The program then sets the line and point increments for the plot subroutines. The
segment counter contains all O's except for one bit, the position of which determines the current segment (see diagram 11 .1), before each sweep, the segment counter is ANDed with the
cQntents of the switches. If the AC then contains 0, the program skips the segment, rotates
the counter left one space, and tests aga in. After illuminating segment 9, the program returns
to the dispatch routine.
When a given segment is selected, the AC contains the contents of the segment
counter after the AND operation. The program then determines whether the segment is in the left,
middle, or right portion of the screen.
The segment is then illuminated by using the plot subroutine four times to sweep
right I left, right, left over the segment. If the adjacent segment on the right is to be illuminated, the program uses the plot subroutines a fifth time, sweeping to the right. This last
sweep ends at the leftmost boundary of the adiacent segment to provide a smooth transition
from one segment to the next.
If the adiacent segment is not to be illuminated, the segment counter is rotated
until another segment is illuminated, or SR 9-17 = 0 and returns to the dispatch routine.
6.1.7.3

Vertical Segmented Sweep Routine (VST)
Except for the following differences, this program is the same as the horizontal

sweep routines.

PDP

LI BRARY

Digital-7-60-N
Page 7
The segments are swept down, up, down, up and the smooth transition is to the
segment be low.
Since the vertical program sweeps the sections in a different order (1, 4, 7, 2,
5, 8, 3, 6, 9), the segment counter is either rotated left three spaces or right five spaces, depending on the number of the current segment.
6.1.7.4

Plot Subroutines

These subroutines can display a vertical Iine which sweeps either from left to
right or from right to left. Similarly, a horizontal line can be swept upward or downward.
The subroutine requires four parameters: the end points of the I ine and the boundaries of the
sweep. Furthermore, two rates must be specified, the point rate and the Iine rate. The point
rate determines the distance between displayed points on the line. For example, a point rate
of 1 plots every point on the line; 4, every fourth point.
The line rate sim ilarly determines the distance between displayed Iines--again,
1 plots every line; 4, every fourth line. Only one bit of a rate number may be 1. After the
six parameters are set, a JMS is executed. The JMS address determines the direction of the
sweep and the orientation of the line.
6.1 .8
\

Light Pen Routine (PEN)

This routine displays the letter P on the CRT. The light pen is used to sense
this display., If the pen is operating correctly the program will complete the display by adding
the letters EN and will continue to display the word PEN until the pen no longer sees light.
When the program is first entered, the Light Pen flag is cleared by DCF and the Light Pen Skip
flag instruction DCF is executed. If a skip occurs, the program halts at address 730, indicating
that the DCF instruction fa i led to c lear the flag or that DSF a Iways skips. A loop responsible
for the display of P is then entered. As part of this loop, the switch register is checked to determine that this register has remained in a 0 state. This allows the operator to exit from the
light Pen routine, and display other patterns at any time.
Actual display of the letter P is delegated to a subroutine (P), which in turn
calls upon a line drawing routine (LINE) to trace the elements of the figure. The loop is reentered after the P is drawn and a program flag (SKIP) is interrogated to determine if an interrupt due to the light pen sensing light has occurred. If no light pen interrupt has occurred,
the Light Pen flag is sensed to see if one was attempted. A halt at location 734 indicates to
the operator that the pen saw light and sets its flag, but that no interrupt resu lted; otherwise,
the loop recyc les.
When an interrupt due to the Iight pen occurs, program control shifts to a subroutine (PE NSE) which sets a program flag (S KI P) and returns control to the point of interruption.

6.2

Examples and/or Applications

PDl?

1I BRARY

Digital-7-60-N
Page 8
6.2.1

Horizontal and Vertical Patterns

These patterns are useful for determining raster position and symmetry. The
lines should be straight, iust touch the edge of the reticle grid, and pass through the center
of the screen.
6.2.2

Diagonal line Pattern

This pattern is useful in the evaluation of decoder network operation and the
detection of dropped, picked up, or interchanged bits. Proper operation yields a straight line,
one point in width, proceeding from the lower left to the upper right of the reticle grid.
6.2.3

Horizontal and Vertical Segmented Sweep

SR 9-17 select any of nine segments on the screen to be checked as shown in
diagram 11. 1. Each segment selected is illuminated in turn by a vertical line moving horizontally or by a horizontal line moving vertically across the screen four or five times.
6.2.3.1

Uniformity of Phosphor Coating
Nonuniform or burnt-out spots on the screen will appear as burnt-out spots.

6.2.3.2

Ripple
If the lines appear wavy, ripple is present somewhere in the display circuitry.

6.2.3.3

Decoder Network
If the line traces are spaced unevenly, the decoder network is not functioning

properly.
6.3

Scal ing (Not Appl icable)

METHODS
(see Section 6.1 .)

FORMAT (Not Appl icable)

EXECUTION TIME

Time between plots can be lengthened by the placement of a suitable LAM
instruction in register 1176 (TIME + 1). The present contents, LAM-1, can be replaced by
LAM-N where N > 1. Each increment will increase time between displays by 4.25 iJsec. *

*24fJsec for PDP-4.

PDP

lIBRARV

Digital-7-60-N
Page 9

10.

PROGRAM

10.4

Program Listing

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PDP

LIBRARY

Digital-7-60-N
Page 10
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PDl?

LIBRARY

Digital-7-60-N
Page 11
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LIBRARY

Digital-7-60-N
Page 12

TYPE 348 DISPLAY TEST POR PUP~4/'
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dMP BEG+;

IGn TO VERT. L.INE TEST
IGn TO ~ORIZ. L.INE TEST
IGn TO OIAG. L.INE TEST
/Gn TO MORtZ. SWEEP TEST
IGn TO VERT. SWEEp TEST

J;':I:):P

LI BRARY

Digital-7-60-N
Page 13
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. LI BRARY

Digital-7-60-N
Page 14
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Digital-7-60-N
Page 15

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PDl?

LIBRARY

Digital-7~60-N

Page 16
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Digitol-7-60-N
Page 17

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Digital-7-60-N
Page 18
IHOU 11 f\IE Tn CONTHOL ILLUMINATIUN OF

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Digital-7-60-N
Page 19
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Page 20
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Page 21

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Digita 1-7-60-N
Page 22

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Digital-7-60-N
Page 23
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Digital-7-60-N
Page 24
CL..EAH,

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Digital-7-60-N
Page 25
11 .

DIAGRAM
Segmented Sweep Program

SEGMENTED SWEEP SECTORS

574

1774
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1320
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574

460

(
SEGMENT
NUMBER

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3
4
5
6
7
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14
13
12

12.

10
9

REFERENCES (Not Applicable)

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