[OKDXA] MOS vs CMOS ICs?

[Kim Elmore]

I have a technical question: I have a couple of Olde Keyers: KC1 Kansas 
City Keyers made by Lance Johnson Engineering. These were 
ground-breakingdevices when they were introduced in 1982 in that they 
were the first ever microprocessor memory CW keyers. They revolutionized 
contesting. These are now nearly 40 y old and showing their age. My two 
have developed problems in that they now lock up after a while and will 
not reset until they're ve been off for awhile. I detect no obvious heat 
issues and I'd like to keep them going.
They are 65XX based devices, using a 6502 microprocessor with a 6522 
interface adapter 6116 8k RAM. These parts are still available and so I 
bought some of each. To my surprise, they don't behave as I expect: the 
keyer comes up in a mode indicating it needs a reset (a common 
occurrence) but won't respond to the reset button..
I have a bag of parts for Steve Gecewicsz, K0CS, sent me a few years 
before he died but after his stroke. It has some parts in there and I 
found a compliment that brought back one of my keyers. Perhaps 
significant: These are MOS ICs, not CMOS ICs. No combination of the new 
CMOS ICs would work, yet these do. I can get MOS 6502s, but I can't find 
MOS 6522s.
Do any of you have experience with anythibg like this? Old ICs work but 
new, supposedly drop-in replacements with don't? Any way around this 
short of redesigning from scratch?
73,
Kim N5OP

-- 
Kim Elmore, Ph

Kim Elmore, Ph.D. (Adj. Assoc. Prof., OU School of Meteorology, CCM, PP 
SEL/MEL/Glider, UAS, N5OP, 2nd Class Radiotelegraph, GROL)

/“Listen, it's too big a world to be in competition with everybody else. 
The only guy I have to get better than is who I am right now.” – Col. 
Sherman T. Potter, 4077 M.A.S.H./