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'not easy' ? Microchip wrote code in XC8( yes, I have the PDF...) CCS wrote their Interrupt 'controller'.( 'all purpose' ).. so you can write your own.
I know in the past, others have 'trimmed down' ...

hmm....

Sounds like a problem in how you designed/built the power supply section of the PCB. Is it rated for at least 3x max running current ? IE say the unit needs 3 amps when running, PSU should ...

Another option, is to code your own Interrupt System.

From what I understand, the CCS approach saves 'lots of stuff' because you might need it.

Providing you KNOW what YOU need to save and use, ...

I've always used a '*', an 'asterik'(sp ) [ shifted 8 ) AKA times character........ as I'm old and have always used text based LCD modules for a 1/2 century.
There IS a 'special ' character in the L ...

for giggles I checked online..it's cold and WINDY here

local store here USB A connector is $3.99 and I have to drive there and back ( 1 hour total road trip.

online TTL<>USB module is $3.9 ...

I've used those serial<>USB modules for years.They save code space( no driver_,4 wire install,preassembled so you can't swap D+ and d- and lose a day wondering WHY doesn't it work like it did 5 ...

Hay, if it ain't broke, no need to fix !!!

Seriously though, a 'daughter' PCB with say, hmm, a 16F84 might be an option ???

Odds are the new PIC and PCB will be cheaper than a 16C55 !

for sure it'll program with a PICSTART+, I have 2 'somewhere'.... course you'll need a PC with a 9 pin COMPORT..... Surprised

booted up the 'beast'..... MPLAB 7v51 and PICSTART+ LIKE the 16C55 !

hmnm, what do you have for a programmer ? You could use MPLAB8c92 and a PICkit3 ??

You might try PIC16F55 and see if it likes it ??

'C' would be quartz window version,so hope you had it covered !

yeesh.... sounds like a 'fun' PIC to deal with !

Kinda wondered why the 'warp speed' for the clock, especially for testing .

I KNOW board layout,wiring,etc. is critical to get more than 10 bits ...

ok ,curious like my cat...FYI I've never used it but...

THAT PIC appears to be 'dual core' . If so I assume YOU have to configure what pins are ADC and where they go --> PIC #1, --> PIC #2
...

After you've used it for 2+ decades, it won't feel 'outdated' rather an extension of your body and soul and you'll appreciate it more !

well you can't be the only person in the world with that remote AND others could benefit from the manchester code, how to setup an IOC ISR, etc.

Now that it works, you should post your completed code in the 'code library' here for others !