Compatibility of external MSX keyboards thread

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By jltursan

Prophet (2273)

jltursan's picture

30-03-2014, 12:27

I really think that such hardware is extremely useful. A PC keyboard adapter can be used with machines with keyboard lost (very common with japanese machines), as a workbench tool to test faulty keyboard machines, as a way to build a MSX into PC cases or simply as a tool to swap the MSX keyboard and customize it with a new one.
Or course there're drawbacks like the wasted slot and keyboard differences; but it brings a lot of new possibilities.

By msxholder

Champion (343)

msxholder's picture

30-03-2014, 21:00

I think it cost me about 4 weeks to figure out the pinning of an ML g3
Alright I'm going sorting again

By rjp

Master (173)

rjp's picture

27-07-2014, 18:56

I couldn't understand a thing... Why there are 26 pins in PX-7 keyboard connector, but it's a DIN 12?

By sd_snatcher

Prophet (3270)

sd_snatcher's picture

16-01-2015, 03:50

Tabajara found out the pinout for the Hitachi MB-H50:

1 - GND
2 - GND
3 - GND
4 - GND
5 - not used
6 - /Y8
7 - /Y7
8 - /Y6
9 - /Y5
10 - /Y4
11 - /Y3
12 - /Y2
13 - /Y1
14 - /Y0
15 - /X7
16 - /X6
17 - /X5
18 - /X4
19 - /X3
20 - /X2
21 - /X1
22 - /X0
23 - /KANA
24 - /CAPS
25 - +5VCC
26 - +5VCC

By wernerkai

Champion (357)

wernerkai's picture

05-06-2015, 00:40

MITSUBISHI ML-G30 MSX2

Keyboard connector as seen from outside the computer:

CON-K/B
------------------------------------------
! 25 23 21 19 17 15 13 11 09 07 05 03 01 !
! ====================================== !
! 26 24 22 20 18 16 14 12 10 08 06 04 02 !
------------------------------------------

!-----!--------!------------!------------!------------!
! PIN ! Signal ! Connection ! Connection ! S3527(IC3J)!
!-----!--------!------------!------------!------------!
!  1  !   X0   !  IC4K-p13  !  IC4K-p12  !   pin 66   !
!  2  !   X1   !  IC6K-p14  !  IC6K-p13  !   pin 67   !
!  3  !   X2   !  IC2K-p2   !  IC3K-p3   !   pin 68   !
!  4  !   X3   !  IC3K-p4   !  IC3K-p5   !   pin 69   !
!  5  !   X4   !  IC3K-p6   !  IC3K-p7   !   pin 70   !
!  6  !   X5   !  IC3K-p10  !  IC3K-p9   !   pin 71   !
!  7  !   X6   !  IC3K-p12  !  IC3K-p11  !   pin 72   !
!  8  !   X7   !  IC3K-p14  !  IC3K-p13  !   pin 73   !
!  9  !   Y0   !  IC4K-p2   !  IC4K-p1   !   pin 74   !
! 10  !   Y1   !  IC5K-p2   !  IC5K-p1   !   pin 75   !
! 11  !   Y2   !  IC4K-p6   !  IC4K-p5   !   pin 76   !
! 12  !   Y3   !  IC5K-p12  !  IC5K-p13  !   pin 77   !
! 13  !   Y4   !  IC4K-p4   !  IC4K-p3   !   pin 78   !
! 14  !   Y5   !  IC5K-p4   !  IC5K-p3   !   pin 79   !
! 15  !   Y6   !  IC4K-p8   !  IC4K-p9   !   pin 80   !
! 16  !   Y7   !  IC5K-p10  !  IC5K-p11  !   pin 81   !
! 17  !   Y8   !  IC5K-p8   !  IC5K-p9   !   pin 82   !
! 18  !   Y9   !  IC5K-p6   !  IC5K-p5   !   pin 83   !
! 19  !   ??   !   jumper   !   jumper   !     NC     !
! 20  ! /CAPS  !    R 87    !    R 87    !   pin 64   !
! 21  ! /KANA  !    R 86    !    R 86    !   pin 65   !
! 22  !  + 5V  !    + 5V    !    + 5V    !     NC     !
! 23  !  GND   !    GND     !    GND     !     NC     !
! 24  !  + 5V  !    + 5V    !    + 5V    !     NC     !
! 25  !  GND   !    GND     !    GND     !     NC     !
! 26  !  + 5V  !    + 5V    !    + 5V    !     NC     !
!-----!--------!------------!------------!------------!

I could not figure out what signal is in pin 19 of the connector. It's linked to a jumper at the PCB, and it has no connection to the S3527. To trace, I must disassembly the whole computer to see the underside of the PCB. I know it should be Y10. In the future I expect to update this. Wink

By Lord_Zett

Paladin (807)

Lord_Zett's picture

16-02-2016, 15:31

msxholder wrote:

duo info 
key board pinning hc-90 hc-95 and HC-95a 
1+2 = +5v
3 =YA
4 =Yb
5 =Yc
6 =Yd
7 =X0
8 =X1
9 =X2
etc
14 =X7
15 =caps led
16 =kana led
17+18+19,20 =gnd

can i conect the leds direct to it or do i need some extra parts to switch?

By popolon_

Resident (55)

popolon_'s picture

30-06-2020, 12:05

Does anybody have Victor HC-95 keyboard matrix picture? Or is it using standard msx keyboard matrix?

By caro

Champion (505)

caro's picture

30-06-2020, 13:45

Victor_HC-90_95

Keyboard connector as seen from outside the computer:
---------------------------------
! 19 17 15 13 11 09 07 05 03 01 !
! ============================= !
! 20 18 16 14 12 10 08 06 04 02 !
---------------------------------

!-----!--------!
! PIN ! Signal !
!-----!--------!
!  1  !  + 5V  !
!  2  !  + 5V  !
!  3  !   YA   !
!  4  !   YB   !
!  5  !   YC   !
!  6  !   YD   !
!  7  !   X0   !
!  8  !   X1   !
!  9  !   X2   !
! 10  !   X3   !
! 11  !   X4   !
! 12  !   X5   !
! 13  !   X6   !
! 14  !   X7   !
! 15  ! /CAPS  !
! 16  ! /KANA  !
! 17  !  GND   !
! 18  !  GND   !
! 19  !  GND   !
! 20  !  GND   !
!-----!--------!

By popolon_

Resident (55)

popolon_'s picture

30-06-2020, 14:01

That is just pin assignement, but i need that matrix that shows rows and columns and what key is in what place in that matrix.

By lintweaker

Master (244)

lintweaker's picture

30-06-2020, 17:22

popolon_ wrote:

That is just pin assignement, but i need that matrix that shows rows and columns and what key is in what place in that matrix.

I guess most keys are at their normal positions (as on Grauw's page: keymatrix )
There are probably a few extra keys? (do not know the keyboard of the HC90/95).

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