HxC External floppy cable, works as A and B

Everything related to using the HxC Floppy Emulator hardware on your Atari.

Moderators: mr.vince, DrCoolZic, Moderator Team

User avatar
galax
Captain Atari
Captain Atari
Posts: 208
Joined: Tue May 27, 2014 5:47 pm
Location: Toronto, Canada

HxC External floppy cable, works as A and B

Postby galax » Thu Jun 26, 2014 7:02 pm

This isn't particularly difficult to do, but I couldn't see any instructions or photos of one anywhere, so I made up my own ST Floppy <-> 34 way connector. Haven't closed it up yet. I based it on the one on the wiki, with a couple of (possibly unimportant) errors fixed. I'll protect the wires when I have finished thoroughly testing it. I could build these if anyone is interested.

Image Image

Here's the pinout:

Code: Select all

34 Way Connector on HxC  = 14 Pin DIN Atari ST Floppy Connector
------------------------   ---------------------------------------
2  Density Select        = 
4  Reserved              = 
6  Reserved              = 
8  Index                 =  4     Index Pulse     (yellow)
10 Motor Enable A        =  8*    Motor On        (dkbrown*)
12 Drive Sel B           =  6     Drive 1 Select  (purple)
14 Drive Sel A           =  5     Drive 0 Select  (dkgreen)
16 Motor Enable B        =  8*    Motor On        (dkbrown*)
18 Direction             =  9     Direction In    (orange)
20 Step                  =  10    Step            (grey)
22 Write Data            =  11    Write Data      (pink)
24 Floppy Write Enable   =  12    write gate      (ltblue)
26 Track 0               =  13    Track 00        (ltbrown)
28 Write Protect         =  14    Write Protect   (ltgreen)
30 Read Data             =  1     Read Data       (red)
32 Head Select           =  2     Side 0 Select   (white)
34 Disk Change/Ready     = 
Any Odd Pins             =  7 + 3 Logic Ground    (black + dkblue)

Colours refer to the wires in my ST floppy cable. No idea if these are universal, but it may speed up your continuity checking a bit!
* Both Motor Enable A and B are connected to the ST's Motor On (makes sense to me!)


I couldn't find the ST floppy 14 pin DIN connectors anywhere (if I could I would have run a recycled ribbon cable into the DIN connector), so I bought an ST male-male drive cable and cut it in half!

For the 34 pin connector I used the following parts from Digi Key, which came to a quite crazy $6, but I couldn't see a simpler or easier way of doing it:

Code: Select all

Qty | Digi Key # | Manufacturer #    | Description
----+---------- -+-------------------|---------------------------------
1   | OR981-ND   | Omron XG5M-3432-N | CONN DBL ROW SOCKETS 34POS AWG24
2   | OR943-ND   | Omron XG5S-1701   | CONN SEMI-COVER 17POS FOR XG5M


The USB to floppy power connector was built from some spare parts:
Image

I first tried it with my 520STM as both drives A and B, worked fine. When I plugged it into my Mega STE with the same settings it worked the same way and I could even boot from it! I unplugged the internal drive as it was making noises. So no need for an A/B switch, if you don't mind temporarily losing the internal floppy when the HxC is acting as A. Could build an adapter and switch that disabled the power to the internal floppy instead I suppose.

Jumper settings for HxC as both drives A and B:
Image

Jumper settings for HxC as external drive (HxC thinks it is 'A' which is the default on power up, ST sees it as 'B'. Only 1 jumper is connected, the one on the right is just half plugged in so I don't lose it):
Image

Geldy
Atarian
Atarian
Posts: 1
Joined: Sun Feb 21, 2016 12:16 pm

Re: HxC External floppy cable, works as A and B

Postby Geldy » Mon Feb 22, 2016 9:24 am

gadlax wrote:
catmando wrote:Hi Galax, I think the edits you've made to the wiki now make that page quite confusing, think it would be better if you'd kept the original page as method 1 and then added your new method as method 2.
gold
Regards

The 'original' cable is a bit out of date now; I would think most people who want an external HxC would buy Lotharek's very neat little case, and so would prefer my cable that requires a lot less soldering. Regardless, if you think you can improve the page, clean it up. The point of having a Wiki rather than just my board posts or website is that anyone can fix or improve the content.


Thanks galax for the pics and tutorial I'll all connected now and it seems to be working smoothly. Thanks bro.
Last edited by Geldy on Tue May 31, 2016 6:56 pm, edited 1 time in total.

User avatar
catmando
Atari Super Hero
Atari Super Hero
Posts: 879
Joined: Tue Jan 24, 2006 9:56 pm
Location: London, UK

Re: HxC External floppy cable, works as A and B

Postby catmando » Mon Feb 22, 2016 12:41 pm

Hi Galax, I think the edits you've made to the wiki now make that page quite confusing, think it would be better if you'd kept the original page as method 1 and then added your new method as method 2.

Regards
Atari Falcon Tos 4.04 | 14mb | IDE CF 2GB
Atari STE Tos 1.62 | 4mb | HxC Slim SD 8GB
Atari STE Tos 1.62/2.06 | 4mb | Floppy A-B Mod | IDE SD 4GB
Atari STFM
Android Devices (Running Hataroid and SToid)

Atari Forum Wiki - Use it before asking

User avatar
galax
Captain Atari
Captain Atari
Posts: 208
Joined: Tue May 27, 2014 5:47 pm
Location: Toronto, Canada

Re: HxC External floppy cable, works as A and B

Postby galax » Tue Feb 23, 2016 3:59 am

catmando wrote:Hi Galax, I think the edits you've made to the wiki now make that page quite confusing, think it would be better if you'd kept the original page as method 1 and then added your new method as method 2.

Regards

The 'original' cable is a bit out of date now; I would think most people who want an external HxC would buy Lotharek's very neat little case, and so would prefer my cable that requires a lot less soldering. Regardless, if you think you can improve the page, clean it up. The point of having a Wiki rather than just my board posts or website is that anyone can fix or improve the content.

User avatar
catmando
Atari Super Hero
Atari Super Hero
Posts: 879
Joined: Tue Jan 24, 2006 9:56 pm
Location: London, UK

Re: HxC External floppy cable, works as A and B

Postby catmando » Tue Feb 23, 2016 11:58 am

galax wrote:
catmando wrote:Hi Galax, I think the edits you've made to the wiki now make that page quite confusing, think it would be better if you'd kept the original page as method 1 and then added your new method as method 2.

Regards

The 'original' cable is a bit out of date now; I would think most people who want an external HxC would buy Lotharek's very neat little case, and so would prefer my cable that requires a lot less soldering. Regardless, if you think you can improve the page, clean it up. The point of having a Wiki rather than just my board posts or website is that anyone can fix or improve the content.


Have split it into 2 methods
Atari Falcon Tos 4.04 | 14mb | IDE CF 2GB
Atari STE Tos 1.62 | 4mb | HxC Slim SD 8GB
Atari STE Tos 1.62/2.06 | 4mb | Floppy A-B Mod | IDE SD 4GB
Atari STFM
Android Devices (Running Hataroid and SToid)

Atari Forum Wiki - Use it before asking

User avatar
DarkLord
Fuji Shaped Bastard
Fuji Shaped Bastard
Posts: 4092
Joined: Mon Aug 16, 2004 12:06 pm
Location: Prestonsburg, KY - USA
Contact:

Re: HxC External floppy cable, works as A and B

Postby DarkLord » Tue Feb 23, 2016 12:03 pm

Would this work with the CosmosEX as well?

Thanks.
Welcome To DarkForce! http://www.darkforce.org "The Fuji Lives.!"
Atari SW/HW based BBS - Telnet:darkforce-bbs.dyndns.org 520

User avatar
galax
Captain Atari
Captain Atari
Posts: 208
Joined: Tue May 27, 2014 5:47 pm
Location: Toronto, Canada

Re: HxC External floppy cable, works as A and B

Postby galax » Tue Feb 23, 2016 1:12 pm

Yes, it works with the CosmosEx. I like to connect things externally so I can quickly swap them between machines. Obviously some CosmosEx features don't make sense externally.

User avatar
DarkLord
Fuji Shaped Bastard
Fuji Shaped Bastard
Posts: 4092
Joined: Mon Aug 16, 2004 12:06 pm
Location: Prestonsburg, KY - USA
Contact:

Re: HxC External floppy cable, works as A and B

Postby DarkLord » Tue Feb 23, 2016 1:45 pm

Right, I was just thinking of having an external floppy drive available, where
the CosmosEx replaces the internal one.

I'd be interested in one if you're going to do any. Any chance I could get it in black? :)
Welcome To DarkForce! http://www.darkforce.org "The Fuji Lives.!"
Atari SW/HW based BBS - Telnet:darkforce-bbs.dyndns.org 520

User avatar
galax
Captain Atari
Captain Atari
Posts: 208
Joined: Tue May 27, 2014 5:47 pm
Location: Toronto, Canada

Re: HxC External floppy cable, works as A and B

Postby galax » Tue Feb 23, 2016 2:15 pm

DarkLord wrote:Right, I was just thinking of having an external floppy drive available, where
the CosmosEx replaces the internal one.

I'd be interested in one if you're going to do any. Any chance I could get it in black? :)


I made up another cable from an ST drive connector and an old PC floppy ribbon cable (the ones with the A/B twist - handy if your external drive can't be configured to act as A/B). I have a few more of each around somewhere- I'll just make them all up sometime and find homes for them.

The ST drive DIN14 connectors are getting quite hard to find though, and with shipping to North America it gets expensive.

elgringo
Atarian
Atarian
Posts: 1
Joined: Tue Aug 16, 2016 3:33 pm

Re: HxC External floppy cable, works as A and B

Postby elgringo » Tue Aug 16, 2016 3:36 pm

Hi,

Can you make an external floppy cable with usb power for me? How much it costs?

Thanks.


Social Media

     

Return to “HxC Floppy Emulator”

Who is online

Users browsing this forum: No registered users and 1 guest