File:ZX81+35 REV 3.0.pdf

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

first version of non prototype ZX81+35

File history

Click on a date/time to view the file as it appeared at that time.

	Date/Time	Dimensions	User	Comment
current	01:59, 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

There are no pages that use this file.