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

JohnBHanson · 9th Apr 2019, 6:42 am

Worth a look at
https://www.americanradiohistory.com...ay-1983-10.pdf
(Page 22) And the corrections in
https://www.americanradiohistory.com...ay-1984-03.pdf

Can be adapted for other keyboards. I connected the outputs of IC4 to the address lines of the eeprom to give me more flexible encoding. In addition the panasonic typewriter has 9 output strobes so the ninth strobe is also connected to an address line of the eeprom. This arrangement also allows characters to be mapped into multiple key presses such as shift/code with other characters. In addtion IC6 can also be omitted using the 8 data lines from the eeprom directly.
I also missed out IC2/IC3 the address comparator. Works fine.

PS. I wrote a perl program to generate the eeprom.

9th Apr 2019, 6:42 am	#34
JohnBHanson Heptode Join Date: Aug 2009 Location: Worthing, Sussex, UK. Posts: 661	Re: MK14 programming interface - MK2 Worth a look at https://www.americanradiohistory.com...ay-1983-10.pdf (Page 22) And the corrections in https://www.americanradiohistory.com...ay-1984-03.pdf Can be adapted for other keyboards. I connected the outputs of IC4 to the address lines of the eeprom to give me more flexible encoding. In addition the panasonic typewriter has 9 output strobes so the ninth strobe is also connected to an address line of the eeprom. This arrangement also allows characters to be mapped into multiple key presses such as shift/code with other characters. In addtion IC6 can also be omitted using the 8 data lines from the eeprom directly. I also missed out IC2/IC3 the address comparator. Works fine. PS. I wrote a perl program to generate the eeprom.