H89 CDR floppy controller schematics!

[norberto.collado koyado.com]

Hello Lee,

Can you share the schematics for the H89 CDR board? I think you might have the board, and I would like to duplicate it.Based on the attached picture, I see two PALs as well. 

Thanks,

Norberto

[Lee Hart]

Hi Norberto. Yes, I can send you the schematic. It's bound into the manual, so it may be a bit tricky to extracate. Could I loan the the manual, and have you return it once you've copied it?

I also have the board, the boot ROMs, and disks with the software for it. I could send the whole package. :-)

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[Joseph Travis]

Hi Lee,

I just sent a CDR FDC-550 board with ROMs and floppies to Norberto today.  I believe someone else posted a PDF copy of the manual on Discord, so he should be good.

Thanks,

Joe 

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[norberto.collado koyado.com]

Thanks Lee! I will get everything that I need. 

Norberto 

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From: se...@googlegroups.com <se...@googlegroups.com> on behalf of Joseph Travis <jtravi...@gmail.com>
Sent: Friday, 31 July 2026 09:47:10
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Subject: Re: [sebhc] H89 CDR floppy controller schematics!

 

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[Lee Hart]

Ok. Let me know if more is needed. :-)

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[norberto.collado koyado.com]

Hello Lee,

 

Do you have the “CDR.DVD” HDOS driver for the CDR Floppy Controller?

 

Thanks,

Norberto

 

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[Lee Hart]

Sorry; I don't have any HDOS drivers for my CDR board.I think they exist; but I'm not sure CDR ever supplied them.

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[norberto.collado koyado.com]

I will need to find LLL’s floppy diskette for HDOS (Livingstone Logic Labs) and hopefully it will be there.

 

Norberto

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