SCHNEIDER EURO PC II 26 PIN FLOPPY TO STANDARD 34 PIN IDC

Emulation of old PCs, PC hardware, or PC peripherals.

SCHNEIDER EURO PC II 26 PIN FLOPPY TO STANDARD 34 PIN IDC

Postby genocho » 2008-7-20 @ 17:34

Hi, I´m looking to replace the internal floppy drive of my Schneider Euro PC II, with a "modern" floppy, but when I extract the floppy and look at the data conector see that not is an "standard" drive.

The drive is a SONY MP-F11W-S0, with 26 pin conector and no pins for power supply. I see no jumpers for select drive ds0 or ds1 (a or b), and how is a 720kb floppy drive no jumper for select high or low density.

The ribbon 26 pin cable has 3 connectors, one goes to the pcb, the last is ribbon twisted (pins 3,4,5,6,7,8,9) and goes to the internal floppy drive, and in the middle there is a male db-25 for external floppy drive:


26 pin conector ------------- male db 25 --------x----26 pin conector with twisted pins 3,4,5,6,7,8,9

In the manual the pinout look at this:

EXTERNAL EURO PC II FLOPPY PINOUT (SECOND DRIVE):

1. /INDEX
2. NC
3. /DRIVE SELECT
4. NC
5. /MOTOR ON
6. /DIRECTION
7. /STEP
8. /WRITE DATA
9. /WRITE GATE
10. /TRACK 0
11. /WRITE PROTECT
12. /READ DATA
13. /SIDE 1 SELECT
14. +5 VOLT
15. +5 VOLT
16. +5 VOLT
17. +5 VOLT
18. POWER ON
19. NC
20. GND
21. GND
22. GND
23. GND
24. GND
25. GND
26. GND

"/" all means active low:

34 PIN IDC FLOPPY DRIVE:

Pin Name Dir Description
2 /REDWC --> Density Select
4 n/c Reserved
6 n/c Reserved
8 /INDEX <-- Index
10 /MOTEA --> Motor Enable A
12 /DRVSB --> Drive Sel B
14 /DRVSA --> Drive Sel A
16 /MOTEB --> Motor Enable B
18 /DIR --> Direction
20 /STEP --> Step
22 /WDATE --> Write Data
24 /WGATE --> Floppy Write Enable
26 /TRK00 <-- Track 0
28 /WPT <-- Write Protect
30 /RDATA <-- Read Data
32 /SIDE1 --> Head Select
34 /DSKCHG --> Disk Change

ALL "/" means active low

PROBLEMS I SEE:

Looking the pinout and comparing with IDC 34 PIN standard I see a lot of things differences:
- PIN 18 in euro pc is for connect or desconnect the supply of the external floppy drive, I think not is neccesary for an normal 34 pin floppy drive.
- PINS 14,15,16,17 are +5v, so I think this pinouts not be used, because 34 pin floppy drive has his own power pins.
- 34 pin idc drive have 4 pins that euro pc floppy don´t 10,12,14,16. Euro pc floppy only have 5 and 6 (motor on & direction) but not says if correspond for a or b drive, so I think can plug 5 and 6 with the corresponding 10,12 for A or 14,16 for B, but I´m not sure if this is the correct way to runs.

I think the rest of the pins are the same, and only have to solder looking at the pinouts tables.

Maybe anyone know how can make run an internal or external idc 34 pin drive
in my euro pc.

Looking in internet I see similar problems in people with korg piano´s and tandy computers, that uses 26 pin floppy drives, but the pinout not is the same at mine.

Thanks in advance and any help is welcome, perhaps anyone make something similar to this, in other machines like amiga, atari, etc,

Waiting for help,

Regards,

Genocho.
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Re: SCHNEIDER EURO PC II 26 PIN FLOPPY TO STANDARD 34 PIN IDC

Postby h-a-l-9000 » 2008-7-20 @ 17:54

Your plan sounds good. You might have to look for 12V though.
1+1=10
h-a-l-9000
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Re: SCHNEIDER EURO PC II 26 PIN FLOPPY TO STANDARD 34 PIN IDC

Postby genocho » 2008-7-21 @ 23:01

Well, finally the idea works.

I solder the common pins of both pinouts, and join all the gnd pins.

I don´t connect pin 34 and pin 2 in idc 34 pin conector, and I use drive sel b and motor enable b.

drive sel a and motor enable a not connected, because I asume this drive may be B unit.

12 volts is not neccesary, the drive runs with gnd and 5v. I use an external power supply, perhaps can use a +5v internal pin, but I don´t want to damage the internals of the euro pc.

I turn on the computer, enter the bios and select driva a 720kb and drive b 720kb, and drive intern for boot.

The pc boots with internal drive and can make a dir in a: and if I put a disk on B I can make a dir on B

If I change the drive boot to external, boots with b and the pc asumes that external floppy is A and internal floppy is B.

All perfect, when I have the exact pinout of the cable I edit this thread with it.

Today is a great day for me, I can connect a "normal" floppy drive to my lovely euro pc II, no more problems if the internal propietary floppy (sony) crashes, now I can replace with a standard one.

Regards, and long life to the XT world,

Genocho.
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Re: SCHNEIDER EURO PC II 26 PIN FLOPPY TO STANDARD 34 PIN IDC

Postby goldmundo » 2010-6-29 @ 10:27

Hello. VERY GOOD WORK! Did you get the complete map of pinout 26 and 34?

You said: "All perfect, when I have the exact pinout of the cable I edit this thread with it. "


I am very interested. I have a T1000 and a T1200 that need a floppy drive. Thank you very much for your response and work. Is helping me a lot.

a greeting

;)
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Re: SCHNEIDER EURO PC II 26 PIN FLOPPY TO STANDARD 34 PIN IDC

Postby genocho » 2011-1-06 @ 16:32

Sorry for late reply.

The exact pinout is like i posted at the beggining, sorry but i think was wrong, but finally was correct, when i posted that i was on testing period.

So if anyone can try it, please post results.

I think can works with 5 1/4 floppy drives using a floppy cable connected to this, or wiring in the same way the 5 1/4 floppy (like it was a 3 1/2 floppy and always like B logic unit).

Any info of success is welcome.

Regards.
genocho
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Posts: 13
Joined: 2008-7-05 @ 11:22


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