OPD: Computer One floppy interface recreation.

stephen_usher · Post by **stephen_usher** » Sun Jul 14, 2024 11:33 am

Now published on Github: https://github.com/stephen-usher/OPD-Co ... -Interface

stephen_usher · Post by **stephen_usher** » Tue Jul 16, 2024 9:41 pm

Starting to get somewhere with the case design:

The main body needs to be about 2mm deeper and the lugs on the front "hatch" longer, but it's getting there.

Pr0f · Post by **Pr0f** » Tue Jul 16, 2024 10:24 pm

Nice work

stephen_usher · Post by **stephen_usher** » Wed Jul 17, 2024 11:03 pm

Other than an issue caused by my filament being a little damp, the case has now come out very well.

I'm about to upload the STL files to GitHub.

Pr0f · Post by **Pr0f** » Wed Jul 17, 2024 11:34 pm

I like the look of that - very professional !

RWAP · Post by **RWAP** » Wed Jul 30, 2025 4:35 pm

What ever happened to this project?

The Telestore was also another target but I don't think anyone managed to read the EPROMs as they are soldered to the board?

stephen_usher · Post by **stephen_usher** » Thu Jul 31, 2025 8:55 am

RWAP wrote: Wed Jul 30, 2025 4:35 pm What ever happened to this project?

The Telestore was also another target but I don't think anyone managed to read the EPROMs as they are soldered to the board?

It's on Github for everyone to enjoy.

https://github.com/stephen-usher/OPD-Co ... -Interface

The Telestore with the RAM expansion was a better product. The limitation of the Computer One interface is that the slave blocks for the filesystem take up some of the memory which prevents things such as the set-up utilities from being able to be used. With more memory this would be solved.

tofro · Post by **tofro** » Thu Jul 31, 2025 8:58 am

stephen_usher wrote: Thu Jul 31, 2025 8:55 am
RWAP wrote: Wed Jul 30, 2025 4:35 pm What ever happened to this project?

The Telestore was also another target but I don't think anyone managed to read the EPROMs as they are soldered to the board?
It's on Github for everyone to enjoy.

https://github.com/stephen-usher/OPD-Co ... -Interface

The Telestore with the RAM expansion was a better product. The limitation of the Computer One interface is that the slave blocks for the filesystem take up some of the memory which prevents things such as the set-up utilities from being able to be used. With more memory this would be solved.

Hmm. Actually, that seems to be a driver problem, then: A proper QDOS device driver must be able to free all used slave blocks when memory gets scarce.

stephen_usher · Post by **stephen_usher** » Thu Jul 31, 2025 9:01 am

The OPD is not running QDOS and the OS treats the RAM as a set of 4K fixed size data pages in a database which it controls.

The machine is acting more like an early 1970s minicomputer than a micro.

The Sinclair QL Forum

OPD: Computer One floppy interface recreation.

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Re: OPD: Computer One floppy interface recreation.