homerwan

Hi Do you know where can i order it? Thanks

yes it can be modded as i've just this very minute finsihed it! gonna fit the nice new drive tomorrow well pleased basically all you need to do it connect the correct wires from the old single plug to the 34 pin normal floppy type plug, i used an old atari ribbon floppy cable from a dead motherboard and connected the strands to the wires, or i guess you could connect the strands direct to the small PCB also and don't forget this! you need to swap the 12v and 5v wires for the floppy drive power plug on the PCB as they are in the opposite way for the original drive! in fact the plug won't fit a new drive so what i did was again from an old ST motherboard i took the floppy drive power cable and connected the 12v pin to the blue wire and 5v to red wire and the 2 x black wires to GND that's it! obviously the new drive needs to be set to DS 0 as if it was going into and ST and the (new) grey ribbon cable needs the notch facing downwards then it will work again.... So, you are saying, that you dont need the external floppy board anymore? Can you show some pictures of how you did it? thanks again

Yes, pin 21 is the side select one. 6 ohms is normal resistance, so connectors are OK. You are welcome. And I'm refreshing little my Atari HW knowledge :-) Hi again, do you think those cables are correct? or just with a plane one must work properly? Im using an EPSON 300 Floppy drive with D0-D1 Jumper select. What do you think? Thanks again

Chips are practically equivalent. So, take out original chip, and best is that you solder in 40-pin socket. Then just insert AY or YM and it will work. Thank´s dude, im going to put the socket first and then try, and i hope that works. thanks again Hi again, do you think those cables are correct? or just with a plane one must work properly? Im using an EPSON 300 Floppy drive with D0-D1 Jumper select. What do you think? Thanks again

Chips are practically equivalent. So, take out original chip, and best is that you solder in 40-pin socket. Then just insert AY or YM and it will work. Thank´s dude, im going to put the socket first and then try, and i hope that works. thanks again

I replace my drive from sf354 with new modern one, build the cable but my drive doesn´t work in double side mode, some people told me that the problem is the YM2149 chip, the thing is i don´t know how to replace it for ay38910, so if anyone can tell me how, would be great. thanks to all.

Yes, pin 21 is the side select one. 6 ohms is normal resistance, so connectors are OK. You are welcome. And I'm refreshing little my Atari HW knowledge :-) So, maybe the ym2149 is not working right, or the 1.44 drive is bad? what do you think? Ps: if i fix this, of course with the help of all of you, im goona be very happy.

Right - that chip is equivalent to YM2149. I checked the pins and the results are.... in 200 omhs (pin 32 (floppy)---------pin 21 (YM2149) = 06.1 omhs) in 200 omhs (pin 32 (floppy)---------pin 26 (YM2149) = 74.3 omhs) Thanks for you patience

According to what you described here, 99% that PSG chip is broken. But it would be good that you check connector(s) - and if can measure that side (head) select line from PSG chip to floppy drive connector - with ohmmeter. If line (or connector) is broken, it is always high level on that pin (at floppy connector) due to pull-up resistor. I don't know is that chip available still - pretty old thing. Chip is YM2149 . Ok, im gonna test the pinouts the connectors and see what next. do you think its possible to replace the chip with the AY-3-8910. thaks again to all

Drive is compatible - side select pin is standard, so not possible that it's the problem. Likely, there is a failure in your PSG chip, what drives (unbuffered) side selection. Btw. you should not ground those pins to GND, it may damaging PSG chip for instance. And no need for do anything that Atari ST recognise DS drive. So, you should replace PSG chip. so you say it´s compatible and the problem is that cursed chip? the chip handled the two heads of the floppy drive? where can i buy one of this and what model do i have to buy? btw my atari is a 520 stm thak´s to all for help me

Drive is compatible - side select pin is standard, so not possible that it's the problem. Likely, there is a failure in your PSG chip, what drives (unbuffered) side selection. Btw. you should not ground those pins to GND, it may damaging PSG chip for instance. And no need for do anything that Atari ST recognise DS drive. So, you should replace PSG chip. where is the psg chip, and what is that? So the only way to make the games of 720k or 800k work is making a format of one side of those capacities and then what? Sorry my bad english and sorry for bother you. Thanks a lot guys and thanks for your quick responses. i´ll be waitting for more

Hi,i have the same problem with de floppy drive and it doesen´t work in double side, can you tell me how did you repair it? becouse i don´t understand very well the 32 pin grounded. how you did it? thanks a lot