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Hacking cartridge HP 84/85
Re: Hacking cartridge HP 84/85
No. I'm working on a hp 664, similar to that on video. But by now I have nothing to share
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Re: Hacking cartridge HP 84/85
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?
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?
Last edited by Brandon on Thu Apr 11, 2019 5:31 pm, edited 1 time in total.
Re: Hacking cartridge HP 84/85
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?
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?
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Re: Hacking cartridge HP 84/85
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- Posts: 116
- Joined: Sat Aug 25, 2018 5:26 pm
- Location: Poland
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- Posts: 116
- Joined: Sat Aug 25, 2018 5:26 pm
- Location: Poland
Re: Hacking cartridge HP 84/85
who can hack hp84
I'm afraid I can't do this, I have no experience
I'm afraid I can't do this, I have no experience
Last edited by MAsic12345 on Thu May 16, 2019 10:47 am, edited 1 time in total.
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Re: Hacking cartridge HP 84/85
I could not get.
here I just added a voltage of 12 volts
here I just added a voltage of 12 volts
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Last edited by MAsic12345 on Thu May 16, 2019 10:48 am, edited 1 time in total.
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Re: Hacking cartridge HP 84/85
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?
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?
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Re: Hacking cartridge HP 84/85
I connected all the contacts and even with the simulated signal
Re: Hacking cartridge HP 84/85
This is a required reading in hp cartridge controll:
http://spritesmods.com/?art=magicbrush
This guy is a genius in reverse engineering!!!
http://spritesmods.com/?art=magicbrush
This guy is a genius in reverse engineering!!!