Author Topic: CPC 6128 Keyboard mod idea  (Read 1603 times)

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Offline ElderlyGoose

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CPC 6128 Keyboard mod idea
« on: 16:20, 19 January 18 »
So I essentially joined to pitch this idea I've had for years and want to know how possible it is;


A reverse keyboard modification, turning a 6128 system into a mechanical USB keyboard but still uses the original architecture.
Ie taking out the membrane keys (and all the problems that keep resurfacing with that), replace them with a PCB and mechanical key system, wire that into a circuit that translates that back into the original CPC membrane input.


I realise the undertaking is massive and that's one of the reasons it's always been on the back burner but I thought I'd ask people with a lot more knowledge than me if it's even a hypothetical possibility of success?


The reason for asking is I've tinkered with my 6128 before and I'm fed up with working repairs, I figure a mechanical keyboard is more reliable but I don't want to sacrifice the original look and feel. If it's not the next plan was to rip out the innards, replace the keys with mechanical and put a pi in or something but really want to avoid that as I love the monitor and disk drive noises that come with the legit.

Offline Bryce

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Re: CPC 6128 Keyboard mod idea
« Reply #1 on: 16:30, 19 January 18 »
Hi,
     As soon as you as you change to mechanical switches you'll have changed the feel. Also, the 6128 membrane is pretty robust and rarely gives issues, only the 664 is known for its dodgy membrane. It would also be an expensive mod due to the size of PCB required.

Bryce.

Offline ElderlyGoose

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Re: CPC 6128 Keyboard mod idea
« Reply #2 on: 16:42, 19 January 18 »
That's the thing, the keyboard at the moment is missing specific keys (so I press and nothing happens).


I've checked the membrane and it appears fine (and the keys don't seem to follow the line - can't remember what the technical term is called), so I've checked the connection and also seems fine but it's always been a niggly query I had.


So I wondered if I took the keyboard entirely out of the equation it might be more successful.

Offline Bryce

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Re: CPC 6128 Keyboard mod idea
« Reply #3 on: 16:45, 19 January 18 »
95% of the time it just needs to be cleaned. If the non-working keys all belong to a certain row or column then it could be the connection to the keyboard, line-driver IC or the AY sound chip.

Bryce.

Offline ElderlyGoose

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Re: CPC 6128 Keyboard mod idea
« Reply #4 on: 16:48, 19 January 18 »
Yeah that was my first thought tbh. I faintly remember deep cleaning it and not getting anywhere but will try again over the weekend.


Essentially just wanted to know if the idea was viable is all (not like I planned to shred any of the innards)  8)

Offline Bryce

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Re: CPC 6128 Keyboard mod idea
« Reply #5 on: 16:55, 19 January 18 »
As part of my "CPC Laptop" project (which is put on ice for many months at this point) I have been converting a laptop membrane keyboard to mechanical switches to allow the CPC matrix to be mapped. It's such a tedious job that I have given up several times by now.

Bryce.

Offline ElderlyGoose

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Re: CPC 6128 Keyboard mod idea
« Reply #6 on: 16:59, 19 January 18 »
There's a good reason I've left this off for years. I remember reading up on the mapping for a CPC 464 I think and that looked like a massive reverse engineering undertaking.


Next on the list is to figure out how to backup my existing disks to usb or something more permanent. Shame there's no external USB disk drive to just buy > pop in the disks > job done.

Offline NiNxPe

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Re: CPC 6128 Keyboard mod idea
« Reply #7 on: 17:19, 19 January 18 »
Is it what you looking for ?




Offline Audronic

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Re: CPC 6128 Keyboard mod idea
« Reply #8 on: 00:50, 20 January 18 »
Hi NiNxPe


Do you have some more detail Please


Ray
Procrastinators Unite,
If it Ain't Broke PLEASE Don't Fix it.
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As I Live " Down Under " I Take my Gravity Tablets and Wear my Magnetic Boots to Keep me from Falling off.

Offline tjohnson

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Re: CPC 6128 Keyboard mod idea
« Reply #9 on: 01:18, 20 January 18 »
There's a good reason I've left this off for years. I remember reading up on the mapping for a CPC 464 I think and that looked like a massive reverse engineering undertaking.


Next on the list is to figure out how to backup my existing disks to usb or something more permanent. Shame there's no external USB disk drive to just buy > pop in the disks > job done.

Get yourself a gotek, flash with Jeffs great HxC firmware, connect with cable to back of machine, use software to backup, having said that trying to backup copy protected disks is more difficult.

Offline ElderlyGoose

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Re: CPC 6128 Keyboard mod idea
« Reply #10 on: 03:10, 20 January 18 »
Is it what you looking for ?




not really but that's super interesting! :D

Offline NiNxPe

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Re: CPC 6128 Keyboard mod idea
« Reply #11 on: 10:45, 24 January 18 »