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.
I think it cost me about 4 weeks to figure out the pinning of an ML g3
Alright I'm going sorting again
I couldn't understand a thing... Why there are 26 pins in PX-7 keyboard connector, but it's a DIN 12?
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
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.
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?
Does anybody have Victor HC-95 keyboard matrix picture? Or is it using standard msx keyboard matrix?
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 ! !-----!--------!
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.
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).