7M13: Difference between revisions

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pictures
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title=Tektronix 7M13 |
title=Tektronix 7M13 |
summary=Readout Unit |
summary=Readout Unit |
image=Tek 7m13 front.jpg |  
image=Tek-7m13-front.jpg |  
caption=7M13 front panel |
caption=7M13 front panel |
introduced=1974 |
introduced=1974 |
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7M13 is intended to include identifying text and picture numbers for photographic documentation.
7M13 is intended to include identifying text and picture numbers for photographic documentation.


==Specifications==
{{BeginSpecs}}
''please add''
{{Spec | Character positions | 2 fields (top, bottom) of 10 characters each }}
{{Spec | Camera counter | 0-99, lower field only; ground contact closure input }}
{{EndSpecs}}
 
==Internals and Repair Issues==
 
The 7M13 is relatively simple and robust electrically (consisting mostly of 74xx TTL logic), however, due to the number of switches, there can be electromechanical problems.  For example, a 7M13 may appear unresponsive if the camera counter "(P)RESET" button is not fully released.
 
The 7M13 uses four 7489 TTL 16×4 RAMs to store the characters entered, and four [[155-0038-01]] Tek-made D/A converter chips to drive the analog row/column readout lines.  One RAM and D/A each are assigned to row and column readout signals in each channel, and are addressed by a counter synchronized to the readout time slot pulses.  In other words, characters are not stored in ASCII bytes but in row/column pairs matching the [[Media:Tek7000-readout-charset.jpg|readout system's character set]].  The keyboard is arranged in a matching matrix of double-contact (DPST) keys that generate the row/column coordinates through 74147 priority encoders.


==Links==
==Links==


* [http://www.amplifier.cd/Test_Equipment/Tektronix/Tektronix_7000_series_special/readout_unit_7M13.htm Tek 7M13 page @ amplifier.cd]
* [http://www.barrytech.com/tektronix/tek7000/tek7m13.html Tek 7M13 page @ barrytech.com]
* [http://www.barrytech.com/tektronix/tek7000/tek7m13.html Tek 7M13 page @ barrytech.com]
* [http://www.amplifier.cd/Test_Equipment/Tektronix/Tektronix_7000_series_special/readout_unit_7M13.htm Tek 7M13 page @ amplifier.cd]
 
==Prices==
{| class="wikitable"
|-
! Year
! 1974
! 1976
! 1980
! 1984
|-
! Catalog price
|align=right|  $375
|align=right|  $425
|align=right|  $600
|align=right| $1,075
|-
! 2015 value
|align=right| $1,800
|align=right| $1,760
|align=right| $1,720
|align=right| $2,440
|-
|}


==Pictures==
==Pictures==


<gallery>
<gallery>
File:Tek 7m13 front.jpg
File:Tek-7m13-front.jpg | 7M13 front panel
Image:7m13-7633.jpg | 7M13 in [[7633]]
File:Tek-7m13-right.jpg | 7M13, right side
File:7m13-manual-page.jpg | Manual page
File:7m13-7633.jpg | 7M13 in [[7633]]
File:File:P6202-risetime-7s12-1ns.jpg | Readout example ([[7844]] Opt.78 mainframe)
</gallery>
</gallery>


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