UK Vintage Radio Repair and Restoration Discussion Forum - View Single Post - MK14 programming interface

SiriusHardware · 24th Apr 2019, 12:59 pm

It is the frequency from which the syncs and the character bit (pixel) rate, etc are derived. There would be no harm in leaving it at 4.43MHz to try it, but the image would likely be slightly small and offset, and might suffer loss of hold due to the refresh rate being too far from 50Hz.

On my 'VDU demo' project which used a PIC to pretend to be MK14 RAM, I used a four pin 4.00Mhz oscillator module to supply the 4Mhz clock.

24th Apr 2019, 12:59 pm	#72
SiriusHardware Dekatron Join Date: Aug 2011 Location: Newcastle, Tyne and Wear, UK. Posts: 11,556	Re: MK14 programming interface - MK2 It is the frequency from which the syncs and the character bit (pixel) rate, etc are derived. There would be no harm in leaving it at 4.43MHz to try it, but the image would likely be slightly small and offset, and might suffer loss of hold due to the refresh rate being too far from 50Hz. On my 'VDU demo' project which used a PIC to pretend to be MK14 RAM, I used a four pin 4.00Mhz oscillator module to supply the 4Mhz clock.