Anyone here got a Kryoflux?

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nama
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Anyone here got a Kryoflux?

Post by nama »

Hi,
Anyone here got a Kryoflux an a couple of OSI 5.25" floppies, and could do a 'Kryoflux stream' dump of the disks?

Cheers

Phil

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dave
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Re: Anyone here got a Kryoflux?

Post by dave »

I will see what I can do.
nama
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Re: Anyone here got a Kryoflux?

Post by nama »

Hi Dave,
That would be great. Both the Flashfloppy and HxC authors say they need this to be able to support the format.
I have a retro computing friend here in NZ who I previously borrowed a Kryoflux from. I've sent an email again asking If I could possibly borrow it to archive a OSI disk, but I've had no reply yet.

I do wonder about the data splitter...
Would we still need a data splitter in conjunction with the gotek?
Would the Gotek be able to emulate a data splitter?
Do we try to image the OSI disks with the kryoflux, with and without a splitter attached?
Many questions.

Phil

2P (1mhz 32k) - 502 + 8k + CEGMON + garbage collector fix BASIC, D&N MEM-CM9 + 24k, 540 (mono) [SOLD]
4PMF (2mhz 24k) - 505, 540, 527, D13 + 5.25" + Gotek
Superboard RevD - CEGMON + 610 board 24k + D13
Spares - 3 x 527, 1 x 505, Backplane
dave
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Posts: 710
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Re: Anyone here got a Kryoflux?

Post by dave »

Hi Phil,

Since the kryoflux models the magnetic media flux transitions, then the data it extracts would be FM enccoded, just like the disk, and a data separator would be needed with the Gotek, just like the real disk. The FM encoding hardware in the disk controller would stay in place as well. That would have the benefit of the Gotek being a drop-in disk replacement for older systems with real disk controllers.

The WinOSI emulator disk images we are using now are essentially a sequence of consistently sized track images after the data separator. The flux transitions are cleaned up and data extracted (by the separator) into tidy 0V/5V levels, ready for the UART.

It should not be too hard to write a translator to go back and forth between the disk images and the kryoflux format. But I'd rather use real kryoflux images to get OSI support into the project.

Cheers,

Dave
Mark
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Re: Anyone here got a Kryoflux?

Post by Mark »

Thinking about Kryoflux, the 8" OS65U disks switch from 8E1 to 8N1 after the 1st three bytes after the index hole. This can cause a byte or two of random data (noise). The disk data is still all FM so it'll probably just work. Just something to check. OS65D keeps things at 8E1 the whole time.
Also 5.25" clocks out at 125KHz, 8" at 250KHz, that is something else to support.

It would be nice to program the Gotek hardware to do the data separation internally or generate the clock bits when presenting the data. I haven't looked at the available I/O pins to see if this is even a possibility.

-Mark
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Re: Anyone here got a Kryoflux?

Post by MK14HAK »

What benefit does the use of the Kryofux add to enabling the Gotek team to produce an OSI version. ?
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