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7M13: Difference between revisions
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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. | ||
== | {{BeginSpecs}} | ||
' | {{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] | ||
==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 | ||
File:Tek-7m13-right.jpg | 7M13, right side | |||
File: | File:7m13-7633.jpg | 7M13 in [[7633]] | ||
File:File:P6202-risetime-7s12-1ns.jpg | Readout example ([[7844]] Opt.78 mainframe) | |||
</gallery> | </gallery> | ||