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Old 6th Jul 2018, 11:26 am   #71
Slothie
Octode
 
Join Date: Apr 2018
Location: Newbury, Berkshire, UK.
Posts: 1,287
Smile Re: MK14 schematic revisions

Quote:
Hated that damn keyboard! Difficult to knock the program in with it.
I still have my pencil-written program for the clock I made, if anyone is interested...I can photo. it, or scan it and publish a link to it.
I used the MK14 to learn, but the clock I made used NO RAM(!), just the registers, and I used HP latching displays. It worked second time! I'd swapped the 10's and 1's of the hours over, so 12:34 read as 21:34. As prom's were expensive then, (and I'd had to make my own prom programmer - which had switches for the address and data, and a button to program that 'nibble' - 4 bits at time) I just swapped the wire-wrapped pins over. Taught me more about computing than kids today can ever learn. 1978, IIRC.
My replica is having tact switches rather than the conductive rubber things on the original MK14.
The tact switches aren't as good as proper keyswitches but they're orders of magnitude better than the original!!
Your clock sounds interesting, as is your inventive solution to the digits!
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