File:ZX81+35 REV 3.0.pdf

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ZX81+35_REV_3.0.pdf(file size: 68 KB, MIME type: application/pdf)

first version of non prototype ZX81+35

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current01:59, 3 April 2016 (68 KB)Mahjongg (talk | contribs)Changed R59 to 10K (from 4K7) for better stability with cassette interface pulses that contain a lot of odd harmonics, which would otherwise randomly "split" the pulse in two digital pulses.
19:23, 28 March 2016 (68 KB)Mahjongg (talk | contribs)changed 10uF cap in cassette interface to 4n7
16:49, 27 March 2016 (68 KB)Mahjongg (talk | contribs)Implemented working cassette input interface
02:22, 23 March 2016 (68 KB)Mahjongg (talk | contribs)Changed the cassette port (first attempt)
04:04, 20 March 2016 (68 KB)Mahjongg (talk | contribs)Changed 2N7002 FETs in joystick interface to MMBT3904 NPN Transistors, source gate capacitance FETs had negative influence on keyboard timing
23:17, 19 March 2016 (68 KB)Mahjongg (talk | contribs)Inverted clock of U18b.
23:02, 13 March 2016 (68 KB)Mahjongg (talk | contribs)first version of non prototype ZX81+35
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