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

SiriusHardware · 19th Mar 2019, 11:10 am

Given a fast enough device, I would not actually put that past you.

As with the other method, there is a caution concerning whether the MK14 involved has a 4.43MHz (as original) crystal or a 4.00MHz crystal, which some originals may have post-VDU and some replicas (like your PIC14) may have by default.

However, I think this is a rare case where having a 4.00Mhz crystal fitted / emulated will actually help, as it will extend the length of the MK14's tape stream 'bit time' slightly and may make it a closer match for 300baud.

19th Mar 2019, 11:10 am	#8
SiriusHardware Dekatron Join Date: Aug 2011 Location: Newcastle, Tyne and Wear, UK. Posts: 11,583	Re: Mk14 programming Given a fast enough device, I would not actually put that past you. As with the other method, there is a caution concerning whether the MK14 involved has a 4.43MHz (as original) crystal or a 4.00MHz crystal, which some originals may have post-VDU and some replicas (like your PIC14) may have by default. However, I think this is a rare case where having a 4.00Mhz crystal fitted / emulated will actually help, as it will extend the length of the MK14's tape stream 'bit time' slightly and may make it a closer match for 300baud.