How do I use .D64 disk images? Trying to get GEOS started in emulator

Bram Doornbos · Post by **Bram Doornbos** » Mon Sep 21, 2020 9:46 am

Hello everyone,

Just as a curiosity I try to start GEOS as it was mentioned on the FAQ and I do have the disk images here.

But I could not find a way to mount D64 disk images within the emulator. Maybe I overlooked a command.

Right now I am stuck with a message "please insert a disk with deskTop V1.5 or higher".

I hope someone can tell me how to do this.

Best regards and thanks in advance,

Bram Doornbos

Ender · Post by **Ender** » Mon Sep 21, 2020 1:51 pm

You should be able to mount it by just running the emulator with "-sdcard APPS64.D64". Keep in mind though, GEOS is only in a semi-working state right now. All the apps from DeskTop fail to load with disk read failures, at least, in my experience.

SerErris · Post by **SerErris** » Tue Sep 22, 2020 7:29 am

No that will not work .. (at least not if this is not an undocumented feature). -sdcard does accept a fat32 .img file ... not a D64 image file.

AFAIK you cannot mount D64 images at all.

Workaround: Take all the files and put it directly in a directory (inside the x64emu). You can extract all the files with DirMaster

desertfish · Post by **desertfish** » Tue Sep 22, 2020 8:23 am

If you need a cross platform solution for that, the VICE c64 emulator also comes with a tool, c1541, that can extract/update/create D64 disk images.

Ender · Post by **Ender** » Tue Sep 22, 2020 1:44 pm

6 hours ago, SerErris said:

No that will not work .. (at least not if this is not an undocumented feature). -sdcard does accept a fat32 .img file ... not a D64 image file.

AFAIK you cannot mount D64 images at all.

Workaround: Take all the files and put it directly in a directory (inside the x64emu). You can extract all the files with DirMaster

It does work, though. I tried it again before making my post. There's glue code in DOS specifically for supporting GEOS.

SerErris · Post by **SerErris** » Tue Sep 22, 2020 1:53 pm

Is this generic support for D64 which is just not documented?

Confused now.

Ender · Post by **Ender** » Tue Sep 22, 2020 2:34 pm

38 minutes ago, SerErris said:

Is this generic support for D64 which is just not documented?

Confused now.

As far as I understand it, the glue code intercepts GEOS's load calls and translates them into something the fat32 driver understands. It's not general D64 support, it just allows GEOS to load from the disk. You can see it in dos/geos.s in the rom code.

RobertJG60 · Post by **RobertJG60** » Wed Jan 06, 2021 11:09 am

how do you get c64 files off a .d64 and onto a sdcard image?

desertfish · Post by **desertfish** » Wed Jan 06, 2021 2:19 pm

Combine the tool that I mentioned a few comments up on this page, and the info from this thread:

Iegen · Post by **Iegen** » Thu Oct 13, 2022 7:35 pm

I know this thread has been inactive for a while, however like the OP said I'm trying to get GEOS to run on the X16 using the BASIC command GEOS. I have D81 and D64 versions of GEOS that run on the C64. I have tried to copy the files to a VHD drive as suggested above. My question is the original D64/D81 files have USR and PRG files. When you extract the files using c1541 from VICE using the extract or geoextract commands you lose the USR type files because when you copy the files to the VHD, they all have the PRG extension. On another point, the memory maps between the C64 and X16 are different, so running the boot loader from the disk probably won't work ... am I correct on that point?

Thank you in Advance for your suggestions/advice.