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Cart #54756 | 2018-08-06 | Code ▽ | Embed ▽ | License: CC4-BY-NC-SA

As many of you may be aware, you can indeed load and save 256-bytes of data broken down to a storage of 64-numbers using conventional method commands of CARTDATA(), DSET(), and DGET().

However, if you want more than this, you will have to use unconventional method commands of CSTORE and RELOAD.

What follows is a sample program I wrote to demonstrate writing 8-bytes to an external file and reading it back again. You can actually load and save up to 🔺8192-bytes of storage this way so it is not to be overlooked !

Definition and instructions are below:

this fairly complex program
will load data from an external
binary file and display the

after this, with the mode set
to zero (0), it will save the
select text to the select
external file so the next time
you run, you will be able to
confirm it is loaded correctly.

note !
this will not work as a true
compiled exe or if you are
attempting to run it directly
from splore.

you must save this .p8 to your
local hard-drive and execute it
-or- run it from an internet
online page.

if you have any questions or
comments, please let me know!
P#54757 2018-08-05 22:56 ( Edited 2018-08-11 12:52)

Wow, Pretty Neat! I don't have any need of it yet, but I will remember this.

P#54795 2018-08-07 11:33 ( Edited 2018-08-07 15:33)

Just know it breaks down and doesn't work properly if you try to compile to EXEs, .JS (run locally), or run from SPLORE.

Hopefully this will be fixed by ZED soon ...

P#54802 2018-08-07 12:41 ( Edited 2018-08-07 16:41)

Multicarts don't work on the BBS or SPLORE, but they should work as binaries or HTML export? Make sure you EXPORT all the cartridge files.


P#54853 2018-08-08 07:41 ( Edited 2018-08-08 11:41)

Hi Tobiasvl:

  • Yes, they work exported to .JS but only =IF= they are run from a true Online site, like Itch.

If you try to run the .JS locally, no, you can't do the multicart saving and loading. Tested with Firefox.

P#54854 2018-08-08 10:36 ( Edited 2018-08-08 14:36)

OK. I wonder why that doesn't work, but I also wonder why you're running the JavaScript version locally. Surely the binaries support it locally, though? What's the problem there? I'm pretty sure there are multicart games distributed as binary executables.

P#54857 2018-08-08 13:06 ( Edited 2018-08-08 17:09)

Testing to see if I can run the HTML and .JS locally as I have a program to convert HTML to EXE in case ZEP's own EXE balked (which it did).

But no, all three of running the EXE, locally running the HTML & .JS, and running your cart from SPLORE - they all fail. You can test this yourself.

P#54865 2018-08-08 14:36 ( Edited 2018-08-08 18:36)

I'll take you on your word, but note that SPLORE is supposed to fail - the BBS (which SPLORE uses) doesn't support multicarts, and likely never will, according to @zep in the post I linked above.

P#54868 2018-08-08 16:55 ( Edited 2018-08-08 20:55)

OK, I tested it anyway, and it seems you're right. Doesn't work with binary or HTML export.

However, for me it doesn't work with the HTML export even if I upload it to itch though.

I made two test carts, test1.p8 and test2.p8, where test1.p8 reloads from and cstores to test2.p8, and exported them to web. This is what I see in Chrome and Firefox's developer consoles (both locally and on itch). This is on Windows btw.

Reload() does work, but either cstore() doesn't update the cart, or subsequent reload()s always just re-reads the original cart.


Navigated to file:///C:/Users/tvl/AppData/Roaming/pico-8/carts/test1.html
test1.js:261 >codo_init
test1.js:261 platform: Emscripten
test1.js:261 codo_system_init
test1.js:261 codo_reset_timer
test1.js:261 codo_gui_init
test1.js:261 codo_keys_init
test1.js:261 codo_text_init
test1.js:261 codo_video_init
test1.js:261 codo_mouse_init
test1.js:261 codo_joystick_init
test1.js:261 <ok
test1.js:261 codo_fopen data.pod (rb) opened
test1.js:261 codo_load_pod: data.pod ok 
test1.js:261 codo_set_screen 128 128 8 100
test1.js:261  set pixel_perfect 1
test1.js:261 codo_sound_init mix_buffer_size: 1024
test1.js:261 audio_init
test1.js:261 Sample Rate: 44100
test1.js:261 mounting /user_data
test1.js:261 codo: mounted filesystem.

test1.js:261 found directory: /user_data/cdata
test1.js:261 found directory: /user_data/cstore
test1.js:261 found directory: /user_data/carts
test1.js:261 starting download..
test1.js:261 0
test1.js:261 loading embedded cartridge
test1.js:261 codo_fopen /user_data/cstore/__f15ee4fa2c340c2d3f83e91138e16724fb766088.p8 (r) failed
test1.js:261 @ mount_embedded_cart: test1.p8 f15ee4fa2c340c2d3f83e91138e16724fb766088
test1.js:261 @ mount_embedded_cart: test2.p8 d6fa7b88fa333166a5c47070d2fe1ca54d1e9e6a

Reload (from test2.p8):

codo_fopen /user_data/cstore/__d6fa7b88fa333166a5c47070d2fe1ca54d1e9e6a.p8 (r) failed
test1.js:261 sandboxed_cstore file not found: /user_data/cstore/__d6fa7b88fa333166a5c47070d2fe1ca54d1e9e6a.p8
test1.js:261   --> using internal file: test2.p8
test1.js:261   reload()ing 1 bytes from: test2.p8
test1.js:261 codo_fopen test2.p8 (rb) failed
test1.js:261  -> returning vdisk file: test2.p8 (rb)
test1.js:261 codo_fopen test2.p8 (r) failed
test1.js:261  -> returning vdisk file: test2.p8 (r)


p8_cstore: storing 1 bytes as: /user_data/cstore/test2.p8
test1.js:261 codo_fopen /user_data/cstore/test2.p8 (r) opened
test1.js:261 codo_fopen /user_data/cstore/test2.p8 (wb) opened
test1.js:261 warning: 2 FS.syncfs operations in flight at once, probably just doing extra work

Maybe you should move this thread to "Support" and hope @zep sees it. He did say in his blog post that this was supposed to work with the HTML export, and that binary support would come soon (although I haven't checked if he later wrote that it was released in a later version).

P#54870 2018-08-08 17:35 ( Edited 2018-08-08 21:58)

Nice to know I'm not the only one suffering from this lack of total recall - well, there it is.

Yes, I'll forward this to SUPPORT. Good idea, T.

P#54873 2018-08-08 19:01 ( Edited 2018-08-08 23:01)

And just for good measure, I reproduced it on Linux, with the Linux executable and in the browser.

P#54892 2018-08-09 03:01 ( Edited 2018-08-09 07:01)

Meaning it did or did not work correctly for Linux, T ?

P#54902 2018-08-09 12:19 ( Edited 2018-08-09 16:19)

I reproduced the error on Linux, meaning it did not work there either.

P#54920 2018-08-10 02:29 ( Edited 2018-08-10 06:29)

Wow ... So ... maybe ?? ZEP will get it working.

If he's worried about security, he could always store the files encrypted deep in \users\ data, but still accessible to the program both for reading and writing.

P#54927 2018-08-10 11:19 ( Edited 2018-08-10 15:19)

Wow ... So ... maybe ?? ZEP will get it working.

If he's worried about security, he could always store the files encrypted deep in \users\ data, but still accessible to the program both for reading and writing persistent data exceeding 256-bytes.

P#54933 2018-08-10 13:28 ( Edited 2018-08-10 17:28)

here's a related thread: https://www.lexaloffle.com/bbs/?tid=29986
the cart I posted there still works (albeit with a typo that makes it write on "itself", hence the colored pixels)
I just exported it to html and bin, works ok...

P#54947 2018-08-11 08:52 ( Edited 2018-08-11 12:52)

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