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Gotek like Optical Driver Emulator - Is it possible?

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Reply 60 of 70, by ExplodingLemur

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pii_legacy wrote on 2020-06-14, 21:00:

I'm patiently awaiting a good ATAPI ODD emulator as well, but for a lot of purposes the iodd2531 is one of my favorite things i've ever owned. Not internal but at least it can appear to the PC as a USB-CD if you wish...

Ooh thanks for letting me know about this! I can use it with some VIA mini-ITX systems I have that present USB storage devices to DOS. Not sure if audio will work though.

Reply 61 of 70, by rjbrown99

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For what it's worth, the SCSI2SD card can also emulate a CDROM device. It's not useful for general purpose retro computing because you have to basically dd your image file to a specific location on the SD card, but it works pretty well for more 'permanent' use of CD images such as operating system install discs.

IE to "change discs" you have to power off your target computer, move the SD card to a more modern computer that has something like dd, rewrite your new CD image to the correct spot on the card, and then move it back to the first system and boot up.

http://www.codesrc.com/mediawiki/index.php/SCSI2SD
http://llamamusic.com/s50s550/microSD_Partitioning.html

Reply 62 of 70, by Snear

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electric_monk wrote on 2020-05-02, 19:36:

Currently DOS will just see it as a plain ATAPI drive - you need to connect something via USB if you want to swap disks/etc. (which could be the DOS machine itself, if you could get USB CDC serial devices working under it).

However, I did install Turbo Pascal (the first language I ever really learned) as I wanted to make a utility you could run in DOS to switch images/etc. from inside the host machine, but I didn't have much time to actually work on that yet!

The most important question for me is: can I boot from the device? I have a lot of mainboards, which do not offer to boot from USB. I always have to attach an IDE-CD-Rom to install an OS. 200$ is quite expensive, but it's worth to finally get rid of those ugly CDs....

Reply 63 of 70, by electric_monk

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Snear wrote on 2020-06-28, 04:45:

The most important question for me is: can I boot from the device? I have a lot of mainboards, which do not offer to boot from USB. I always have to attach an IDE-CD-Rom to install an OS. 200$ is quite expensive, but it's worth to finally get rid of those ugly CDs....

I don't remember if I tried it, but it should work (from the PC's BIOS it should just look like a normal ATAPI device, which just involves reading a fake floppy disk image off the CD-ROM, somewhat bizarrely). I can certainly give it a go anyway.

Also, I am aware of the mounting issues, it was originally meant to just plug into the CD ribbon cable socket of a Konami 573, so originally I hadn't planned to require any actual sort of mounting beyond just being plugged in. However, it was hard to source the 90 degree connectors, and people wanted to use it in other systems anyway, so that requirement doesn't exist anymore, so I plan to try and add some screwholes the next time I do a run (alongside a better SD card slot). After that, it should be easy to 3D print a 3.5" or 5.25" enclosure with the right holes for both the PCB and the drive bay.

Reply 65 of 70, by dr.wily

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The best ODE must be a device who simulate only the laser pickup (and his mechanism) for 100% compatibility.

Unfortunaly this type of ODE does not yet exist and devive like Mega SD , Super SD or PSiO for example are not realy true ODE, just some sort of emulation.

Reply 67 of 70, by schlomoe99

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Such a device that could be made bootable and run mixed-mode CDs would be a real holy grail for the retro community. Audio-out is a key feature, via SPDIF if available but via 4-pin analog at a minimum. I think a lot of users here would be interested in a drive emulator like that!

Reply 68 of 70, by electric_monk

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Chadti99 wrote on 2020-07-28, 11:04:

Electric_monk,

Apologies is this was already covered but I’m not quite clear. Can you attach an audio cable between your device and a sound card for in-game cd audio in say Quake?

Sorry yes, analog audio is on the 4 pin header at the top left, same pinout (LGGR) as a real optical drive. Sadly no SPDIF currently, but I believe the SPDIF chips still available also take I2S same as the ADC, so it may be possible to just drop one in alongside the DAC, so I'll have another look as I've had that request a few times.

Reply 69 of 70, by Jo22

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I forgot, there's also *.CDR format.. It's also used for archiving ancient shareware CDs hosted on archive.org
that predate ISO9660 and use High-Sierra.
Perhaps that's a better choice than the boring ISO/BIN combo. 😉

"Time, it seems, doesn't flow. For some it's fast, for some it's slow.
In what to one race is no time at all, another race can rise and fall..." - The Minstrel

//My video channel//

Reply 70 of 70, by Jo22

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Here's a little history lesson for the youngsters among of you who do know nothing but ISO (ISO9660), BIN+CUE (or worse, with MP3 tracks)..
https://en.wikipedia.org/wiki/High_Sierra_Format
https://fileformat.fandom.com/wiki/CDR
😜

"Time, it seems, doesn't flow. For some it's fast, for some it's slow.
In what to one race is no time at all, another race can rise and fall..." - The Minstrel

//My video channel//