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Re: Hacking cartridge HP 84/85

Posted: Fri Nov 16, 2018 11:33 am
by math
No. I'm working on a hp 664, similar to that on video. But by now I have nothing to share :|
MAsic12345 wrote:
Thu Nov 15, 2018 7:29 pm
math wrote:
Thu Nov 15, 2018 6:22 pm
@dragonator
I love this video! Thak you very much!!! Coincidentally I'm working in this cartridge.
you work with a cartridge HP 84?

Re: Hacking cartridge HP 84/85

Posted: Fri Nov 16, 2018 7:56 pm
by Brandon
With the HP45 you can clearly see patches of ink stopping when you disable some pads. With some time you can already get a good idea of which pad does which area of nozzle. With your printhead it might be a bit more problematic, there are not that many pads that really do anything, so disabling any pad might just stop it printing completely.how to use the sizegenetics extender The only thing you might find is how many data pins there are. If you tape of channel 1, 4, 8 or 13, you might get half the head stopping, and half continuing, but that is no guarantee.

By the looks of it 4 and 8 handle data, while 1 and 13 look like clock pins. What 9 and 10 are doing is a bit of a mystery to me. That is my guess though, I do not have the most experience with serial protocols.

Is the logic analyzer graph from you printing the entire picture or just part of it?

Re: Hacking cartridge HP 84/85

Posted: Sat Nov 17, 2018 8:47 pm
by Wonko
Here is an example to toggle bits as fast as possible using assembler: https://forum.pjrc.com/threads/31350-Ma ... eensy-3-2)

You can modify 8 or even 16 bits with a single instruction, but you have to prepare the patterns that you want to send. There is also an instruction to set or clear a single bit. Unfortunately, this gets quite complicated. Machine code is meant to be simple for machines, and not for humans.

http://infocenter.arm.com/help/topic/co ... 01_UAL.pdf

Maybe I can try to write something if you can give me some logic pattern output that you want to generate?

Re: Hacking cartridge HP 84/85

Posted: Sun Nov 18, 2018 11:45 am
by MAsic12345
Wonko wrote:
Sat Nov 17, 2018 8:47 pm
Maybe I can try to write something if you can give me some logic pattern output that you want to generate?
This is a logic analyzer file.
24 MHz .rar
(136.17 KiB) Downloaded 85 times

Program to open the file?
https://www.saleae.com/downloads/

Re: Hacking cartridge HP 84/85

Posted: Sun Nov 18, 2018 11:58 am
by MAsic12345
Brandon wrote:
Fri Nov 16, 2018 7:56 pm

Is the logic analyzer graph from you printing the entire picture or just part of it?
this is only one carriage movement from one side to another
it's about the .rar file above

Re: Hacking cartridge HP 84/85

Posted: Thu Nov 22, 2018 7:59 pm
by MAsic12345
who can hack hp84
I'm afraid I can't do this, I have no experience

Re: Hacking cartridge HP 84/85

Posted: Thu Nov 22, 2018 7:59 pm
by MAsic12345
I could not get.

here I just added a voltage of 12 volts

Re: Hacking cartridge HP 84/85

Posted: Sat Nov 24, 2018 5:58 pm
by dragonator
I would really like to see this printhead work and help you, but I really lack the time. When I do get time for this, I would like to help, but that could be months.

Did the printhead just leak when you applied 12V? Did you only connect the 12V (and ground) or did you also attach the signal pins to anything?

Re: Hacking cartridge HP 84/85

Posted: Sat Nov 24, 2018 6:28 pm
by MAsic12345
I connected all the contacts and even with the simulated signal

Re: Hacking cartridge HP 84/85

Posted: Mon Jan 14, 2019 3:20 pm
by math
This is a required reading in hp cartridge controll:

http://spritesmods.com/?art=magicbrush

This guy is a genius in reverse engineering!!!