Jump to content
IGNORED

i want to build an sd card floppy disk or hard disk controller for my ti99


xxx

Recommended Posts

ive had a look online and have found one site but there are no gerber files for it.

 

https://github.com/dennishatton/TI-99-4a_SD_Disk_Project

 

or a hdd controller sd card card

 

https://web.archive.org/web/20130719134114/http://nouspikel.group.shef.ac.uk/ti99/titechpages.htm

 

i dont want surface mount components, only through hole on either

 

any help would be welcomed...

Edited by xxx
Link to comment
Share on other sites

8 minutes ago, Hans23 said:

The is no PCB layout for this design, so there are no Gerber files either.  It looks like an interesting project, though.  Does anyone here have experience with it?

so what r all those files on the site?

Link to comment
Share on other sites

Just now, xxx said:

so what r all those files on the site?

I see the schematics and the code to run in the AVR that is doing the FDC controller emulation, as far as I understand.  It also seems that the original FDC controller ROM is used, but a patch is provided to make it support larger disks.  If you want to build it, you'll need to build in on perfboard or design a PCB yourself.  The KiCAD schematic makes that reasonably easy.  It could still not work :)

  • Like 2
Link to comment
Share on other sites

Hans, 

 

Just going to throw a couple of ideas out there for you if you have not considered them, etc.

 

There are MFM, IDE and SCSI drive emulators (SCSI2SD and DREM for MFM, and IDE emulators though I do not recall the specific name) out there that connect to our existing SCSI, IDE and Myarc HFDC controller cards. Those emulators you may be able to pair up with something as they have SD cards for storage.  I'm pointing this out as it may save you some development time.

 

I believe both the Myarc HFDC and SCSI cards have their eprom source code out there.  I know the HFDC does, not 100% sure of the SCSI card.  Again, it would save development time for writing software.

 

Now, as far as controller chip availability, that may be another completely separate issue.  I would think SCSI may be more likely than MFM, but I guess it is possible someone has designed replacement chips for today's more modern chips.

 

Having said all of that, I am not sure from your post if you were responding to the files not being available for the TIPI.  I actually thought everything was out there but I could be mistaken.  

 

Right now, I would say TIPI is the route people will pursue from a market perspective, though I think there is a chip shortage for the CPLD it uses which may limit immediate availability.  Pretty much, the TIPI has unlimited (multi-GB's) storage capacity which supersedes (at present) disk storage options for MFM, IDE, SCSI.

 

Beery

  • Like 2
Link to comment
Share on other sites

55 minutes ago, xxx said:

ive had a look online and have found one site but there are no gerber files for it.

 

https://github.com/dennishatton/TI-99-4a_SD_Disk_Project

 

or a hdd controller sd card card

 

https://web.archive.org/web/20130719134114/http://nouspikel.group.shef.ac.uk/ti99/titechpages.htm

 

i dont want surface mount components, only through hole on either

 

any help would be welcomed...

In the case of the IDE Hard Disk Controller that you referenced, the only existing GERBERS for it utilize surface mount components. Note that you were pointed to his old site. The new one is here, but the data is the same.

 

 

  • Like 1
Link to comment
Share on other sites

54 minutes ago, xxx said:

ive had a look online and have found one site but there are no gerber files for it.

 

https://github.com/dennishatton/TI-99-4a_SD_Disk_Project

 

or a hdd controller sd card card

 

https://web.archive.org/web/20130719134114/http://nouspikel.group.shef.ac.uk/ti99/titechpages.htm

 

i dont want surface mount components, only through hole on either

 

any help would be welcomed...

I sell the IDE interface card freshly built.  You can hook up a direct IDE TO CF card adapter or IDE to SD Card adapter to achieve what you are looking for.  contact me via PM.  they are all built NEW and takes me about a week to get it built and run it through a good test phase.

 

 

  • Like 2
Link to comment
Share on other sites

Just now, xxx said:

how much r they?

IDE Hard Disk Controller Card (fwscart.com)

 

I sell them for $300, it includes my new Real Time Clock module that allows you to change the battery.  the older clock chips are obsolete and expensive to find.  I can get ahold of the BQ4852 which works very well and has the onboard 512k SRAM already installed.  That's an extra $30 if you go that route as they are not cheap.

 

If you want one I need to add stock so you can buy.  I just got more parts in yesterday and have not updated my stock levels.

 

PM me if so.

 

  • Like 3
Link to comment
Share on other sites

I already had boards built and there are flaws in that design that are keeping it from working. For instance, he put the wrong chip in for one of the chips and so therefore it'll never work unless we redesign for that new chip after we already had boards. Made fun, fun fun

Sent from my Pixel 6 Pro using Tapatalk

Link to comment
Share on other sites

2 hours ago, arcadeshopper said:

I already had boards built and there are flaws in that design that are keeping it from working. For instance, he put the wrong chip in for one of the chips and so therefore it'll never work unless we redesign for that new chip after we already had boards. Made fun, fun fun

Sent from my Pixel 6 Pro using Tapatalk
 

if you get an updated gerber file with the correct chip to me I can put in an order for those boards along with the ones I'm going to be ordering next couple of weeks.

Link to comment
Share on other sites

I think the chip your talking about is the 74LS540 inverted buffer.

 The schematic originally showed a 74LS541 non inverted buffer.

Both chips have the same pinout. You can use the same board.

 

I have been using this board for about about 3 years without a problem.

I wire wrapped mine and didn't make a PCB.

When I changed the chip I forgot to update the schematic.

You could also correct it in the firmware by adding an invert instruction.

As I originally done due to TI sending data inverted.

Edited by Madhatter1
  • Like 2
Link to comment
Share on other sites

  • 2 weeks later...

I've delete the KiCad folder until I get a PCB made.
Footprint spacing for the edge card connector is not right.
The rows are 100 mil should be 200 mil apart for an edge card.

 

The schematic is right as I have built this on a bread board and has working for me.

I was trying to make PCB with Gerber files for others.

I'm not putting it back until I have a PCB made and working.

The thing is I have already order PCBs

I could possible get them to work But I am just going to order new ones.

  • Like 3
Link to comment
Share on other sites

If you have already order PCBs as I have.
I have created an adaptor board.
The adaptor has a dual row pin header at top and edge card at bottom.
Install pin header on the adaptor then insert through the holes in the SD Drive board and solder to SD Drive board.
The pin header will also be used for the optional 32K daughter board.

I will be uploading a new SD Drive board to github that will not need the adaptor.
I will also upload the adaptor and 32K daughter board.

  • Like 5
Link to comment
Share on other sites

Join the conversation

You can post now and register later. If you have an account, sign in now to post with your account.
Note: Your post will require moderator approval before it will be visible.

Guest
Reply to this topic...

×   Pasted as rich text.   Paste as plain text instead

  Only 75 emoji are allowed.

×   Your link has been automatically embedded.   Display as a link instead

×   Your previous content has been restored.   Clear editor

×   You cannot paste images directly. Upload or insert images from URL.

Loading...
  • Recently Browsing   0 members

    • No registered users viewing this page.
×
×
  • Create New...