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Gauging interest in a XF551 modified board for 1088XEL


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#26 MacRorie OFFLINE  

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Posted Thu May 11, 2017 6:41 PM

This sounds like an AWESOME idea



#27 mytekcontrols OFFLINE  

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Posted Thu May 11, 2017 9:12 PM

This is a very good idea. I support it fully.

A couple thoughts. Could you use Bob1200XL's xf-551 roms so we could use either 5.25 or 3.5 drives. I see these for sale all the time on ebay.

Be sure there is enough clearance for when all the other '3rd party' mods get installed this will still fit properly. 

Can you set the default data transfer speed to the fastest available?

 

This was a public release way back when, so it would only be a matter of burning it into an EPROM.

 

Might want to check with Bob to see if he's done any more recent revisions to the code, so that you have the latest greatest version.

 

- Michael



#28 tjlazer OFFLINE  

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Posted Thu May 11, 2017 9:49 PM

I am certain you would sell a lot of the XF551 PCB's for the ST SF 314/354 cases!



#29 KLund1 OFFLINE  

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Posted Fri May 12, 2017 3:11 AM

 

This was a public release way back when, so it would only be a matter of burning it into an EPROM.

 

Might want to check with Bob to see if he's done any more recent revisions to the code, so that you have the latest greatest version.

 

- Michael

 

Yes. But just would like to see that it could still be used with your proposed build. And I do have a couple in eprom now, and easily available now too.



#30 Dropcheck OFFLINE  

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Posted Fri May 12, 2017 6:29 AM

 

Yes. But just would like to see that it could still be used with your proposed build. And I do have a couple in eprom now, and easily available now too.

 

As long as it worked with the original XF551 unaltered board, it should work with my build.   :)

 

Looking at this blog post.  It might be possible for a 4in1 OS.  I am looking into adding to the board. :grin:



#31 Dropcheck OFFLINE  

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Posted Sat May 13, 2017 1:28 PM

Just to give an update:
 
I am in the process of trying to add the functionality of the SDrive as a daughter card onto the main board.  It will be offered as an option.  The basic board is nearly finished.  Here's a couple of renderings of what it would look like.
 
snapshot00.png
 
snapshot200.png
 
snapshot301.png
 

And then finally the front panel that will bolt onto the two brackets to provide control and display.

 

snapshot400.png



#32 pajero_pn OFFLINE  

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Posted Sun May 14, 2017 1:24 PM

Paisu  or  Pasiu :?



#33 Dropcheck OFFLINE  

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Posted Sun May 14, 2017 2:46 PM

Paisu  or  Pasiu :?

 

That would be Pasiu.  All misspellings should be corrected before release.  :)



#34 Dropcheck OFFLINE  

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Posted Wed May 17, 2017 10:01 PM

This is great news :-D

 

I'll be running some confirmation tests on the 'PSU Control Interface' early next week and post the results here. Basically this interface allows the XEL to switch ON and OFF the PSU's high current and 12V outputs via the same mechanism that switches on it's own main power bus. And the XEL will derive it's power supply from the PSU's standby circuit, which is limited to 2 amps max (more than sufficient for the XEL's needs). The PSU's normal 5V and12V supplies will of course be used by Dropcheck's XF551 board and floppy drive.

 

For hooking up the XF551 board internally, the XEL has a SIO AUX Port header that can likely supply it's needs...

 

4fdQeDO.jpg

 

2PI4vah.png

 

 

- Michael

 

Any further word?



#35 mytekcontrols OFFLINE  

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Posted Wed May 17, 2017 11:39 PM

 

Any further word?

 

Sorry but we ran into some serious problems in our beta tests with the first two builds that currently defy logic. Since these people are very vested into this project I have to tackle this first. But I promise I will get back to the PSU tests soon.

 

- Michael



#36 mytekcontrols OFFLINE  

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Posted Thu May 18, 2017 2:17 PM

1088XEL PSU Tests

 

- Michael



#37 Dropcheck OFFLINE  

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Posted Thu May 18, 2017 4:47 PM

1088XEL PSU Tests

 

- Michael

 

 

:thumbsup:



#38 Dropcheck OFFLINE  

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Posted Fri May 19, 2017 9:00 AM

Okay I now have somewhat firm costs for each of the 3 levels of boards I plan to offer.

1. XF551XEL Basic

Reimaged XF551 mainboard to fit within a 3 1/2" drive bay connected to the 1088XEL's Aux SIO connector. ATX12V/EPS12V compatible adapter board to enable a normal PC case power supply.

User will need to provide 8040/8050 CPU, WD1772 Floppy Controller, 2764 Eprom chip programmed with your choice of XF551 OS and a XF551 3 1/2" or 5 1/4" drive mech. User will also need to provide necessary circuitry to activate a ATX12V power supply for the drive mech.

Cost = $45.00 plus shipping

2. XF551XEL w/Track Display, 4in1OS and Drive # Selector, Reset Switch & Power LED

Reimaged XF551 mainboard to fit within a 3 1/2" drive bay connected to the 1088XEL's Aux SIO connector. ATX12V/EPS12V compatible adapter board to enable a normal PC case power supply for drive mech power. Front facing pcb with track display, 4in1OS and drive # selector switch, reset and power led.

User will need to provide 8040/8050 CPU, WD1772 Floppy Controller, 27128 Eprom chip programmed with upto 4 XF551 OS and a XF551 3 1/2" or 5 1/4" drive mech.

Board is upgradeable to SDriveXEL addition, but user will have to purchase own parts and do the upgrade. Some SMD soldering, but mainly TH parts. Parts BOM will be published.

Cost = $75.00.00 plus shipping

3. XF551XEL w/Track Display, 4in1OS and Drive # Selector, Power LED, and SDriveXEL

Reimaged XF551 mainboard to fit within a 3 1/2" drive bay connected to the 1088XEL's Aux SIO connector. ATX12V/EPS12V compatible adapter board to enable a normal PC case power supply for drive mech power. SDriveXEL pcb will be stacked atop the XF551XEL board and contain circutry for SDrive. Front facing pcb with track display, 4in1OS and drive # selector switch, reset and power led and leds and control buttons for the SDriveXEL.

User will need to provide 8040/8050 CPU, WD1772 Floppy Controller, 27128 Eprom chip programmed with upto 4 XF551 OS and a XF551 3 1/2" or 5 1/4" drive mech.

Cost = $120.00 plus shipping

4. ATX12V1088XEL Daughter Card

ATX12V compatible adapter board to enable a ATX12V 24pin PC case power supply for drive mech power.

Cost = $10.00 plus shipping



#39 pixelmischief ONLINE  

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Posted Fri May 19, 2017 9:27 AM

And is this thing expected to fit into an SF3X4 case?



#40 Dropcheck OFFLINE  

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Posted Fri May 19, 2017 9:43 AM

And is this thing expected to fit into an SF3X4 case?

 

No.......  It's meant to fit in a regular PC case for the 1088XEL project as the topic title indicates.  :)   SF3X4 compatiblity is for another topic. 



#41 Dropcheck OFFLINE  

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Posted Fri May 19, 2017 2:20 PM

Slight change to the option 1:

 

   I should have struck out the line "ATX12V/EPS12V compatible adapter board to enable a normal PC case power supply."  The adapter is not included in this option.  As the title says basic. 



#42 Dropcheck OFFLINE  

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Posted Fri May 19, 2017 3:31 PM

Okay here's the final renderings. 

 

 

     None of the XF551XEL boards will include the Intel 8040/8050, WD1772 or the eprom OS chips, and some of the part images depicted will not be exactly the same, but otherwise this is a very close representation of what you will recieve not including the data cabling for the drive and the power cables for the board.

 

 First the XF551Basic version:

 

XF551XELBasic00.png

 

Next the XF551XEL Advanced boards:

 

XF551XELAdv00.png

 

 

XF551BezelXEL00.png

 

And then finally the most complete option:

 

 

XF551XELComp00.png

 

XF551XELBezelComp00.png

 

XF551XELSDrive00.png

 



#43 Dropcheck OFFLINE  

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Posted Fri May 19, 2017 3:41 PM

One final rendering:

 

   The ATX12VXEL Adapter:

 

     ATX12VXELAdapter00.png



#44 pajero_pn OFFLINE  

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Posted Sat May 20, 2017 8:23 AM

Schema and gerber will be opensource?



#45 Dropcheck OFFLINE  

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Posted Sat May 20, 2017 5:14 PM

No. Unfortuanately.   :(   

 

But the SDrive NUXX is already published with schematics and gerber files.  I've simply modified some of the parts and layout to work with my design.  You are welcomed to come up with your own implementation for the 1088XEL project  though.  

 

The ATX12V adapter is a companion board to allow easier usage with a normal ATX12V power supply.  As it is, the board is just the power receptacle and pcb tracing to a three wire connector to mate with the AUX power connector on the 1088XEL.  Hardly a secret piece of engineering. :)   Again you are welcomed to design your own or buy other ready made products to accomplish that. 

 

The XF551 project is also not a secret piece of engineering, but after putting in a ton of time and effort to get it up and running both in it's original form and in this project, I am understandably not willing to release my work on it to open source yet. I am actively still producing and supporting the product.  Again you are welcomed to design your own.  The Atari source information is available.  :)



#46 Dropcheck OFFLINE  

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Posted Thu Jun 1, 2017 9:06 PM

After more deliberation I've decided to offer the SDriveXEL as a standalone option as well.  It will be completely populated and completely separate from the XF551XEL board. 

 

Cost will be $45.00 plus shipping.

 

Here's a couple of renderings of what to expect.  Again the parts won't be exactly the same, but it does give you an idea of the way it will look.

 

 

SDrive1.png

 

SDrive2.png

 

One other thing I've been toying with:

 

On the sandwiching of the boards for the complete XF551 with the SDrive option, I am becoming increasingly concerned at the height restrictions for the 3 1/2" drive bay.  I tried a couple of designs to see if I could get the height down.  The most satisfactory design ended up being the more costly design.  Go figure.   :( 

 

On the original design you needed a total of three boards to have the complete features of track display, front controls, SDrive and XF551 circuitry.  On the this newer design, I've put all but the controls, leds and display on a single 4 layer pcb.  That means just the mainboard and the front panel, only 2 boards needed.  But that meant a more expensive board because of the 4 layers and the size of the mainboard.   It's added almost $16 more to the cost for both option 2 and 3.  

 

Now there's no economic way to do both.  So one or the other is going to be the baseboard of options 2 and 3. 

 

Depending on the option you chose some of the parts will not present, but here is a rendering of the 4 layer pcb.

 

XF551Complete00.png



#47 Dropcheck OFFLINE  

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Posted Fri Jun 2, 2017 6:26 PM

Due to some sleuthing by Mytekcontrols,  the new combined mainboard option should be cheaper than originally thought.  It might be a more realistic $3-5 more.  So at this point I feel reasonably confident that I will be using the combined 4 layer board for options 2 and 3. 






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