msx keyboard changing

Par elements

Master (179)

Portrait de elements

10-06-2005, 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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Enlighted (6067)

Portrait de NYYRIKKI

10-06-2005, 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.

Par BiFi

Enlighted (4348)

Portrait de BiFi

10-06-2005, 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.

Par Manuel

Ascended (19462)

Portrait de Manuel

11-06-2005, 12:25

Depends what you mean with 'lots'. The Sony has about 8 pins, the Philips about 26.


Paladin (1012)

Portrait de POISONIC

15-07-2005, 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

Par Repair-Bas

Paragon (1174)

Portrait de Repair-Bas

15-07-2005, 05:57

sony has 13 pins

Par Manuel

Ascended (19462)

Portrait de Manuel

15-07-2005, 10:40

13? OK, 8 comes close enough Smile Anyway, much less than the 26 of the Philips, which I actually counted Smile

Par GerhardT

Supporter (6)

Portrait de GerhardT

15-07-2005, 15:32

Hi all!

Inside the Sony keyboard, there is a circuit with four ICs. The connecter is as following:
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 and

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.


Par Manuel

Ascended (19462)

Portrait de Manuel

16-07-2005, 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...)