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

SiriusHardware · 8th Apr 2019, 12:16 am

Wow, you don't hang around. Glad the PROMs turned out to be genuine and programmed OK.

I'm interested in the fact that you had to lengthen the delay constants - is that with a 4.43MHz crystal or a 4.00MHz crystal in the MK14?

I'm also interested in the apparent difference between the keypad edge connector on my (issue II) MK14 and the JM replica.

It's a little bit late to look at it tonight but I will repeat your experiments with a jump lead to see if the edge connector pins I marked 'NC' on my diagram really are not connected on my machine.

The 'NC' on my diagram may just mean 'Don't connect this' as opposed to 'There is nothing connected here'. My original sketch for the keypad connector layout (from which all of this more recent stuff is derived) is more than 40 years old.

8th Apr 2019, 12:16 am	#23
SiriusHardware Dekatron Join Date: Aug 2011 Location: Newcastle, Tyne and Wear, UK. Posts: 11,586	Re: MK14 programming interface - MK2 Wow, you don't hang around. Glad the PROMs turned out to be genuine and programmed OK. I'm interested in the fact that you had to lengthen the delay constants - is that with a 4.43MHz crystal or a 4.00MHz crystal in the MK14? I'm also interested in the apparent difference between the keypad edge connector on my (issue II) MK14 and the JM replica. It's a little bit late to look at it tonight but I will repeat your experiments with a jump lead to see if the edge connector pins I marked 'NC' on my diagram really are not connected on my machine. The 'NC' on my diagram may just mean 'Don't connect this' as opposed to 'There is nothing connected here'. My original sketch for the keypad connector layout (from which all of this more recent stuff is derived) is more than 40 years old.