Help hacking and restoring AX-350II sakhr

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Par gdx

Prophet (4017)

Portrait de gdx

28-03-2018, 10:59

ali6x944 wrote:

I found SNES Joypad/mouse adapter and the appropriate mouse in ebay for a good price, but I see your comments on the snes mouse is not accurate, sadly i didn't find UMJA USB joystick/mouse adaptor on ebay. additionally , dose snes mouse glitch or is so bad and unusable?

It works well but a real MSX mouse is better in general. If you already have the adapter, do not hesitate to take the mouse if you have it for a good price. Do not forget also the SNES mouse is not wireless, and the ball must be cleaned from time to time.

Par ali6x944

Master (196)

Portrait de ali6x944

30-03-2018, 06:36

because i had found modes in this forum for rev wt-02, not ss-01...
however i saw hacks for the ss-02 on some Amiga forums:
http://flashback-computing.com/viewtopic.php?f=10&t=198&sid=...
sadly it is in a language i don't understand -probably Greek-, but the images are very helpful thou.
from the image he re-routed the rdy pin to 34 on the floppy connector, jumper moved from ds1 to ds0, an re-route dc to pin 2.

Par Jipe

Paragon (1430)

Portrait de Jipe

30-03-2018, 11:56

Par ali6x944

Master (196)

Portrait de ali6x944

30-03-2018, 13:03

thanks, but my drive is not the same

Par ali6x944

Master (196)

Portrait de ali6x944

31-03-2018, 20:33

Dose any one have the pinout of a sakhr msx floppy?
I guess I might need a converter board like the one used for the turbo r...

Par Wild_Penguin

Hero (623)

Portrait de Wild_Penguin

02-04-2018, 18:57

Hi Ali6x944,

Replying to the other thread about NMS8255 floppies made me want to reply here, too.

First a question: Why do you follow instructions for making a PC drive work on an Amiga??? IIRC Amiga does not follow Shugart Standard (and neither does PC, but it is very close - or actually follows the standard such that the drives are always configured as DS1 but do not use "Ready" signal).

It is most likely that the AX350(II) follows the Shugart standard, since the very closely related ax500 does. I haven't confirmed this, but my AX350II does not have the original floppy drive but some other one (with jumpers for DS0, DS1 etc.) and it has not been modified in any way.

From this page, I think a quote is in place:

Quote:
  • See if your Floppy drive have some jumper. If yes, search for one RDY or Ready jumper and set it to Ready position different from its actual position. This is needed because PC doesn’t have a Ready function, which indicates that exists a disk on drive. If your drive doesn’t have jumpers, just connect the pin 34 onto any odd pin connected Gnd. This will always send a Ready signal to the computer even if drive is NOT ready.
  • The PC drive is always set to DS1: which is the B: drive. If the drive is started at boot but doesn’t work like A: drive, you will have to plug WIRE 10 on PIN 12 and WIRE 12 on PIN 10. This is not needed if you wish to use the drive as B:. Alternatively some PC drives have solder jumpers, default to DS1 but changeble to DS0.

This means, provided that the floppies you have are PC compatibles, you only need to add a jumper to have RDY signal "ON" all the time. IIRC on some MSX floppy controllers you do not need the signal, but some do. After doing this, the drive should work as drive "B:". If you need to make it work as drive "A:", first 1) try to find a jumper from DS1 to DS0, and failing that 2) swap pins 10&12 by some other means.

Par ali6x944

Master (196)

Portrait de ali6x944

04-04-2018, 07:42

What signals should be on which pins?
And what signals should be enabled other than ready and DS0?
Dose opa and opb have to be enabled?

Par Wild_Penguin

Hero (623)

Portrait de Wild_Penguin

04-04-2018, 16:29

I doubt that the exact controller will tell anything about the floppy drive connector pinout.

I checked from my AX350II and I've confirmed (with fair certainty) that this computer has a standard Shugart interface, since the MB has a 34 pin connector (well, the IDC connector is soldered on the MB, but anyways), and the original cable is "straight" i.e. no pins are swapped, and it has a separate, standard power connector. Moreover, my unit has a NEC FD1037A (most probably not original since it is grey). That is a standard DD floppy drive, which has some jumpers to change which signal (/DS0 or /DS1) will activate it.

In other words: the pinout is Shugart Standard. You can find it in the AX500 SM I've linked above, in the Wiki on this page, or via Google.

This means that PC drives are almost compatible. Make sure the disk drives you got are actually (PC/Shugart) standard; if they are not - stop. Making such drives work is quite difficult. If they are, just follow the instructions I've quoted above from MSX info pages; in other words:

  • Short pin 34 with GND (This might not actually be required, see the quote above).
  • make sure the drive is jumpered as /DS0, i.e. activates from pin 10 (PC drives will use pin 12 per default, i.e. /DS1).

That is all.

About opa, and opb, I have no idea what you are talking about.

Par ali6x944

Master (196)

Portrait de ali6x944

05-04-2018, 15:18

Wild_Penguin wrote:

I doubt that the exact controller will tell anything about the floppy drive connector pinout.

I checked from my AX350II and I've confirmed (with fair certainty) that this computer has a standard Shugart interface, since the MB has a 34 pin connector (well, the IDC connector is soldered on the MB, but anyways), and the original cable is "straight" i.e. no pins are swapped, and it has a separate, standard power connector. Moreover, my unit has a NEC FD1037A (most probably not original since it is grey). That is a standard DD floppy drive, which has some jumpers to change which signal (/DS0 or /DS1) will activate it.

In other words: the pinout is Shugart Standard. You can find it in the AX500 SM I've linked above, in the Wiki on this page, or via Google.

This means that PC drives are almost compatible. Make sure the disk drives you got are actually (PC/Shugart) standard; if they are not - stop. Making such drives work is quite difficult. If they are, just follow the instructions I've quoted above from MSX info pages; in other words:

  • Short pin 34 with GND (This might not actually be required, see the quote above).
  • make sure the drive is jumpered as /DS0, i.e. activates from pin 10 (PC drives will use pin 12 per default, i.e. /DS1).

That is all.

About opa, and opb, I have no idea what you are talking about.

mmm... this is kinda sad...
the sdf-321b is pc compatible only, so I have to make an adaptor or change the orientation of the conductors in the cable by means of disassembling the conductor's head and rewiring the connections as required...
dose any one know how to match the signals or know if they are remotely identical?

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