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.81 files to .p file anyone ???

Posted: Wed Jan 06, 2021 10:13 am
by Its1982again
Hi everyone. Does anybody have a way of converting .81 file downloads to .P files? I've only used an android tablet, and phone, to download stuff but I'm able to get everything to SD for both the DZXuino and DivMMc future, as well as the PlayZX app of course. Just need help with these stubborn .81 files! Cheers.

Re: .81 files to .p file anyone ???

Posted: Wed Jan 06, 2021 11:45 am
by 1024MAK
Apart from the filename, they should be the same format. However see also the details in this document ;)

Mark

Re: .81 files to .p file anyone ???

Posted: Wed Jan 06, 2021 12:00 pm
by Its1982again
Thanks for that Mark, and the attatched document. Thing is, the DZXuino doesn't like .81 files so they must be stored or read differently? I'm just getting going so forgive my ignorance. These things certainly get a grip after 39 years! :)

Re: .81 files to .p file anyone ???

Posted: Wed Jan 06, 2021 12:01 pm
by XavSnap
Yes, it true !
:lol:

The ".81" is a "P" file with a tape name header !
In fact, is the RAW wav file, generated by a Save command.
The "P" take his name from the DOS name, the ".81" get his name form the file (not displayed in the file).

Example:
.P = myprograM [memory DATAS]
.81 = [memory DATAS]

Just cut the ZX string to the fist character > 128 (inverted !)
And save the end has "P" file.

But, all of emulators seem to read a 81 has a P file.
Just rename your 81 file to a P file…and the emulator will reconstruct the P file name as a tape file.

If this renamed file don't run, just add a 128 character before your file.

Re: .81 files to .p file anyone ???

Posted: Wed Jan 06, 2021 2:59 pm
by 1024MAK
As there are slight differences, maybe the software for the DZXuino does not take account of these differences?

Do the files you want load in an emulator?

Mark

Re: .81 files to .p file anyone ???

Posted: Wed Jan 06, 2021 3:21 pm
by Its1982again
Not tried an emulator, not realy my thing. I'm going straight from the DZXuino to a physical machine.

Re: .81 files to .p file anyone ???

Posted: Sat Jan 09, 2021 2:00 pm
by chernandezba
Just rename the extension, the files are exactly the same

Re: .81 files to .p file anyone ???

Posted: Sun Jan 10, 2021 8:27 pm
by XavSnap
exactly the same
NO !

:twisted:

Re: .81 files to .p file anyone ???

Posted: Sun Jan 10, 2021 8:38 pm
by XavSnap
The 81 is a memory dump , create and saved from the Basic memory room.

The Z81 format save all the memory and registers.

The P format was (is) the tape dump format !
The "P" file is an "Xtender" format.

10 PRINT "HELLO WORLD" on EO… SAVE "HELLOWORLD" … it save a tape file!

The problem in EO, it save the .81 to a wrong P format based on a reconstructed DOS name…



i reload the famous P file !
P2.JPG
EO use to load .81 and add the header to retrive the P file format !
But, it's NOT the same format, there's no name header in the 81 files...

81 file contant start after les ZX name…

Re: .81 files to .p file anyone ???

Posted: Sun Jan 10, 2021 9:18 pm
by XavSnap
p3.JPG
WRX game:
STARFIGH.81
(5.07 KiB) Downloaded 6 times