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elements
msx freak
Berichten: 170 |  Geplaatst: 10 Juni 2005, 12:06 |
hello i have a msx nms 8250 en hb-700p , but i would like to use my sony keyboard at my msx nms 8250. how i can change the connector for my sony keyboard, or the philipskeyboard connector. the reason, the quality of my sony keyboard is much better tehn a philips keyboard. who has a schematics for changing connectors.
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NYYRIKKI
msx master
Berichten: 1509 | Geplaatst: 10 Juni 2005, 12:50 |
If I remember correctly Phillips keyboard has connector with lots of pins and Sony has only few pins.
So... I think, there is no electronics inside Phillips keyboard, but Sony keyboard must have some kind of keyboard encoder chip.
This means, that it is not just changeing connector, but you also need to add some electronics.
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BiFi
msx guru
Berichten: 3142 | Geplaatst: 10 Juni 2005, 14:45 |
Sony also has a lot of pins... only in a different connector. I think it's possible when somebody can make a conversion cable.
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manuel
msx guru
Berichten: 3447 | Geplaatst: 11 Juni 2005, 12:25 |
Depends what you mean with 'lots'. The Sony has about 8 pins, the Philips about 26.
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POISONIC
msx professional
Berichten: 883 | Geplaatst: 15 Juli 2005, 04:24 |
haha the nms8250 has a small print in the keyboard so if.... the keyboard matrix is the same it could be done but i doubth that
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Repair-Bas
msx addict
Berichten: 383 | Geplaatst: 15 Juli 2005, 05:57 |
sony has 13 pins
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manuel
msx guru
Berichten: 3447 | Geplaatst: 15 Juli 2005, 10:40 |
13? OK, 8 comes close enough  Anyway, much less than the 26 of the Philips, which I actually counted |
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GerhardT
msx friend
Berichten: 6 | Geplaatst: 15 Juli 2005, 15:32 |
Hi all!
Inside the Sony keyboard, there is a circuit with four ICs. The connecter is as following:
Pin2 CAPS LED
Pin3 ... Pin 10 keyboard row
Pin7 ... Pin 10 keyboard column selection (by using flipflop and decoder ICs)
Pin11 switching between column and row
Pin12 +5V
Pin13 GND
Pin1 is not used in the keyboard, but called "KANA" (?) on the mainboard of the computer.
Inside the keyboard of my 8280, there exists no such circuit (there is nothing but some diodes and the keys). Thus, the Philips keyboard needs more lines. 11 separate lines for column selection, 8 lines for the keyboard row, one for CAPS LED and one for +5V. 3 lines are GND, one line is NC. One line "KANA" is not used in the keyboard. Makes 26 lines.
You can find the schematics of the keyboards inside
http://www.funet.fi/pub/msx/mirrors/hanso/service_manuals/philipsnms8280sm.pdf and
http://www.funet.fi/pub/msx/mirrors/hanso/service_manuals/sonyhbf700psm.pdf
You see, compared to the Sony, the NMS communicates with the keyboard in a very different way.
If you really want to use a Sony keyboard on the 8280, you will have to change the circuit inside the Sony Keyboard.
:-(
Regards,
Gerhard |
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manuel
msx guru
Berichten: 3447 | Geplaatst: 16 Juli 2005, 00:26 |
KANA is for an optional KANA led. The only European MSX computer that has it is the Philips VG-8000/8010, AFAIK.
(Where it is labeled CODE...)
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