2.8" QD Disk Emulation

[cnairn]

Hello, Jeff and all!

I've not posted anything until now but have checked in now and again on the Quick Disk project. I came to post some links for you that I thought might help. I now see that you've been making a lot of progress in the last few weeks. Congratulations and thank you. I have a Korg SQD-8 that I use sometimes but cannot save anything, so, you can see why I am here.

It looks like I am late to the party on your recent advances. Figuring out that some games and other equipment used the QD drives by another name led to my "discovery", because, I know how gamers are always going to find a way to play their games! Anyway, I will share the links just in case they are helpful in some way.


https://wiki.nesdev.com/w/index.php/Everdrive_N8
http://www.vgmoz.com/famicom-disk-syste ... -emulator/
http://www.retrocollect.com/News/ninten ... lable.html
http://arduino.validalo.net/wiki/index. ... arp_MZ-800

Kind regards and thanks for the hard work,

Chris

[Jeff]

Yamaha MDF-1 reported compatible.

So i added it into the schematic :

[AMSynths]

Hi
I have tried out the new QD firmware and it unfortunately does not load/save correctly:

Saved S-220 Quick Disk file is here:

DSKA0000.zip

(11.63 KiB) Downloaded 335 times

It did not verify and fails to load. The S-220 does send the file and the Gotek LED light.

[Jeff]

Hi
I have tried out the new QD firmware and it unfortunately does not load/save correctly:

Saved S-220 Quick Disk file is here:

DSKA0000.zip

It did not verify and fails to load. The S-220 does send the file and the Gotek LED light.

Thanks. Apparently something is recorded. I am checking if the record length fit in the read window defined in the QD file.

[Jeff]

Hi
I have tried out the new QD firmware and it unfortunately does not load/save correctly:

Saved S-220 Quick Disk file is here:

DSKA0000.zip

It did not verify and fails to load. The S-220 does send the file and the Gotek LED light.

Thanks. Apparently something is recorded. I am checking if the record length fit in the read window defined in the QD file.

No it doesn't ! I defined 5.5 second, apparently at least 6.2 seconds are needed ! Let me change a parameter in the QD file !

[Jeff]

Try to read this one. (i kept your data inside !)

DSKA0000.zip

(11.21 KiB) Downloaded 345 times

[atari12]

anyone would like to make and sell right pin out cable for MD-280 and gotek HxC drive?
i have no knowledge of soldering cables..

by the way, would there be any possibility of using HxC drive directly connected to Akai s612 avoiding of using MD-280?

[AMSynths]

Same problem, Illegal QD on load and Verify Error on save...

[AMSynths]

Save and verify takes about 10.5 seconds

[Jeff]

Save and verify takes about 10.5 seconds

Can put the result QD file here please ?

Are you using the last QD firmware (v3.4.1.4a) ?
Have you an oscilloscope ? Can you check that there is something on the read data line ? (i mean with the right high and low voltage level).

[AMSynths]

I am using the latest software. Here is the data being read and written. Note that the write is inverted compared with the read, which is in line with the Roland timing diagram. Clock frequency is close to the 101.56kHz from the QD chip on the main board. The pulses are accurate in duration at 9.84us.

The read cycle continues past the display of the Illegal QD message, until the end of the data stream.

[Jeff]

I am using the latest software. Here is the data being read and written. Note that the write is inverted compared with the read, which is in line with the Roland timing diagram. Clock frequency is close to the 101.56kHz from the QD chip on the main board.

Why the write pulse are in the negative voltage value ? Are you in AC mode ? There is also lost of ringing. is the oscilloscope probe ground connected ?

I will check again on the MO5 the emulator behaviour.
Oh and please post the QD file (EDIT got it ) . This may help to see/detect a write issue.

btw have you tried another usb stick brand/model ? Theoretically a "slow enough" usb stick may produce write issues since all is recorded in real time. The memory buffer can't store the whole track on this hardware.

[Jeff]

Well, it appears that the read window in the previous QD file was still too small...

attached some fixed files. Please try to write only one time per file and send me back them. (Of course you can read them many times you want).

QD_Images.zip

(1.7 KiB) Downloaded 351 times

[AMSynths]

Here is the file written to once by the S220.

[Jeff]

Here is the file written to once by the S220.

I suppose that you can't read it ?

Can you check with the oscilloscope if the S220 do a single write, or some multiple write (sector write ?) : i see two sync word at different places on the track.
Is the write gate always asserted during whole write, or do you see it changing ?

Can you write once on the others images too and post them here ?