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
Click on a date/time to view the file as it appeared at that time.
|current||01:59, 3 April 2016||(68 KB)||Mahjongg||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||changed 10uF cap in cassette interface to 4n7|
|16:49, 27 March 2016||(68 KB)||Mahjongg||Implemented working cassette input interface|
|02:22, 23 March 2016||(68 KB)||Mahjongg||Changed the cassette port (first attempt)|
|04:04, 20 March 2016||(68 KB)||Mahjongg||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||Inverted clock of U18b.|
|23:02, 13 March 2016||(68 KB)||Mahjongg||first version of non prototype ZX81+35|
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