geekhack
geekhack Marketplace => Great Finds => Topic started by: berserkfan on Sun, 12 January 2014, 02:30:04
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http://www.ebay.com/itm/Vintage-Computer-TRS-80-Model-4-MINT-CONDITION-RARE/171210731109?_trksid=p2045573.m2102&_trkparms=aid%3D555012%26algo%3DPW.MBE%26ao%3D1%26asc%3D298%26meid%3D4060275290665814203%26pid%3D100034%26prg%3D1079%26rk%3D7%26rkt%3D8%26sd%3D151065545447%26
I find this very intriguing. Maybe someone will know something.
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http://www.ebay.com/itm/Vintage-Computer-TRS-80-Model-4-MINT-CONDITION-RARE/171210731109?_trksid=p2045573.m2102&_trkparms=aid%3D555012%26algo%3DPW.MBE%26ao%3D1%26asc%3D298%26meid%3D4060275290665814203%26pid%3D100034%26prg%3D1079%26rk%3D7%26rkt%3D8%26sd%3D151065545447%26
I find this very intriguing. Maybe someone will know something.
I thought beam spring was IBM only? Also, I'm pretty sure this is a linear switch. The one I typed on felt like foam and foil, but there were lots of iterations to the TRS-80 that it could be something else.
Edit: The TRS-80 Model 4 is definitely discrete switches, so not beam spring or foam and foil:
(http://farm3.staticflickr.com/2201/2456185118_12e132848c_n.jpg)
Edit2: It appears to use discrete rubber dome switches...
http://www.vintage-computer.com/vcforum/showthread.php?13610-Keyboard-repair&highlight=keyboard+switches (http://www.vintage-computer.com/vcforum/showthread.php?13610-Keyboard-repair&highlight=keyboard+switches)
(http://www.brutman.com/pics/TRS80_Model_4_Keyswitch.jpg)
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Interesting...
The switches of a TRS-80 Model 3 can be seen here: http://geekhack.org/index.php?topic=21206.msg402810#msg402810. They look like Vintage Alps (http://deskthority.net/wiki/Alps_vintage_tee_mount).
I have seen the TRS-80 Model 1 also have this mechanical switch.
So they changed the switch type for the Model 4 ...