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TA ScreenTyper 5.25 in. floppies

Posted: Mon Feb 20, 2017 4:40 pm
by adamsabi
I have several 5.25 in. floppy disks that I believe were created with a Triumph-Adler ScreenTyper computer. I haven't been able to deduce the disk type, though, and have tried all of the KryoFlux image formats. Does anyone happen to know what disk type these floppies could possible be and is it possible KryoFlux cannot read them?

Thanks, Abby

Re: TA ScreenTyper 5.25 in. floppies

Posted: Mon Feb 20, 2017 8:04 pm
by ZrX
Can you upload a dump somewhere for us to check?

Re: TA ScreenTyper 5.25 in. floppies

Posted: Thu Mar 09, 2017 4:52 pm
by adamsabi
Sure, I could upload them to DropBox. You're talking about preservation stream files, right? Thanks, Abby

Re: TA ScreenTyper 5.25 in. floppies

Posted: Thu Mar 09, 2017 5:48 pm
by ZrX
Yes, from those we'll be able to analyse the used formatting.

Re: TA ScreenTyper 5.25 in. floppies

Posted: Thu Mar 09, 2017 10:23 pm
by adamsabi
Here's a link to download the files: https://www.dropbox.com/s/sga9tba5g365l ... s.zip?dl=0

Thanks!

Re: TA ScreenTyper 5.25 in. floppies

Posted: Fri Mar 10, 2017 8:39 am
by ZrX
DTC can decode the disk as is, but the filesystem looks to be custom. Side 0 has a directory and side 1 just text.

Re: TA ScreenTyper 5.25 in. floppies

Posted: Sat Mar 11, 2017 3:04 pm
by ZrX
The disks are 40 tracks, 2 sides, 10 sectors per track, 512 bytes per sector, but the filesystem treats it as 1024 bytes per sector. Side 0 is used first and when full continues on side 1.

I've been able to figure out most of the very simple filesystem to extract files, except the exact size of a file.

Re: TA ScreenTyper 5.25 in. floppies

Posted: Sun Mar 12, 2017 11:49 am
by brightcaster
Supercopy should read and write theese disk on MSDOS PCs (so called SCREENT-Format)! Google for scopy_335.zip to get a copy including a full manual in german language. But be aware that you need a native MSDOS PC to install the special floppy drivers via the CONFIG.SYS file...

Supercopy covers about 250 different formats (mostly CP/M) and went public domain years ago. Unfortunately the source code seems to been lost!

Regards, David

Re: TA ScreenTyper 5.25 in. floppies

Posted: Sun Mar 12, 2017 1:42 pm
by ZrX
Looking through the manual with my almost non-usable german language I don't think that program can work with actual filesystems, other than perhaps CP/M.

Re: TA ScreenTyper 5.25 in. floppies

Posted: Sun Mar 12, 2017 3:01 pm
by brightcaster
The screentyper (as most what TA/alphatronics did that time) is a CP/M machine (afaik)!

David