After seeing the XTant, FSSK/FEXT, Model MF, and the 3277 PCBs, I'm wondering what the PCB of the 50-key IBM 4740 keyboards look like. (That's the 10 x 5 ortholinear one). I know that a number of people here have them. Has anyone scanned the PCB or at least taken a good picture?
References:
PCB for the 50-key IBM 4740
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- Location: Massachusetts
- Main keyboard: Model M
- Main mouse: Apple Magic Trackpad
- Favorite switch: Buckling spring
- DT Pro Member: -
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- Location: Singapore
- Main keyboard: IBM Model F122 XT Beamspring 3727
- Main mouse: Logitech MX Master
- Favorite switch: Buckling Spring
- DT Pro Member: -
I think it'll be relatively simple to build one for the M50! They already have the metal plates, all we need is the PCB and Model F flippers and it'll practically be the same as the 4704 F50.
Sent from my SM-G965F using Tapatalk
Sent from my SM-G965F using Tapatalk
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- Location: Des Moines / Cedar Falls, IA, USA
- Main keyboard: IBM Model F107
- DT Pro Member: 0190
Yes, you I have previously confirmed that the 4704 Model F50 PCB fits the M49/M50 and internal assemblies are identical. All you would need is to remake the same PCB and add Model F hammers and an xwhatsit and you would be good to go. If anyone can design the PCB, I can run the group buy and even sell kits that have all of the above included.
Only thing you might have to do is a slight case modification with a dremel for the xwhatsit if there are any plastic bits in the way.
Alas, I don’t have easy access to an F50 to do a scan of it or send pictures :/
Only thing you might have to do is a slight case modification with a dremel for the xwhatsit if there are any plastic bits in the way.
Alas, I don’t have easy access to an F50 to do a scan of it or send pictures :/
- PlacaFromHell
- Location: Argentina
- Main keyboard: IBM 3101
- Main mouse: Optical piece of shit
- Favorite switch: Beamspring
- DT Pro Member: -
Would an F50 PCB be suitable for an M50 keyboard? I think it has the necessary space for the controller, but never opened mine.
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- Location: Singapore
- Main keyboard: IBM Model F122 XT Beamspring 3727
- Main mouse: Logitech MX Master
- Favorite switch: Buckling Spring
- DT Pro Member: -
This could complement the F62 remakes perfectly! A main 60% board and a side macropad for numpad/arrow cluster would be amazing!orihalcon wrote:Yes, you I have previously confirmed that the 4704 Model F50 PCB fits the M49/M50 and internal assemblies are identical. All you would need is to remake the same PCB and add Model F hammers and an xwhatsit and you would be good to go. If anyone can design the PCB, I can run the group buy and even sell kits that have all of the above included.
Only thing you might have to do is a slight case modification with a dremel for the xwhatsit if there are any plastic bits in the way.
Alas, I don’t have easy access to an F50 to do a scan of it or send pictures :/
Sent from my SM-G965F using Tapatalk
- hasu
- Location: Japan
- Main keyboard: HHKB
- Main mouse: HHKB
- Favorite switch: Topre
- DT Pro Member: -
you guys are talking without thread starter as usual
http://kishy.ca/?attachment_id=1678
of course, kishy did.TerminalJunkie wrote: ↑After seeing the XTant, FSSK/FEXT, Model MF, and the 3277 PCBs, I'm wondering what the PCB of the 50-key IBM 4740 keyboards look like. (That's the 10 x 5 ortholinear one). I know that a number of people here have them. Has anyone scanned the PCB or at least taken a good picture?
http://kishy.ca/?attachment_id=1678
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- Location: Massachusetts
- Main keyboard: Model M
- Main mouse: Apple Magic Trackpad
- Favorite switch: Buckling spring
- DT Pro Member: -
Thanks, hasu! Some questions:
- There is a copper dot above each capacitive pad. Does anyone know what it's for? My XT PCB has them too.
- There is a pad and hole near the end of each row trace. Are these test points left over from development?
- Some of the column pads in the bottom layer (http://kishy.ca/?attachment_id=1676) have pink/white dots on them. Does anyone know what they are or signify?
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- Location: Massachusetts
- Main keyboard: Model M
- Main mouse: Apple Magic Trackpad
- Favorite switch: Buckling spring
- DT Pro Member: -
A clue: the two copper dots are right under the "feet" (pivot points) of the flipper. I still don't understand their purpose in the design. If it were just to lift the flipper a little, they could have made the feet taller. Perhaps the dots make those parts of the PCB smoother or more resistant to wear?