Another attempt for I2C eeprom, this time - 25C256.

[CuriousOne]

Now I need bitwise hex editor - one that allows editing hex file by bits, not by bytes. Any ideas

[HenrikOlsson]

Not directly and the following isn't a hex editor but if it's intended purpose is to create "content" for LCDs then https://www.mikroe.com/glcd-font-creator might be what you're looking for.
Here's another one https://www.buydisplay.com/lcd-font-maker and another https://kapusta.cc/2020/03/20/fontedit/

I've not used any of them, I know Richard is using the one from MikroE.

[CuriousOne]

Yes I know all these
The issue with Mikroe "creation" is it, as everything else done by them, is written with left feet- need admin priviledges to run it, and it outputs fonts rotated by 90 degrees
But currently I don't need font editor or graphics editor, I already have all that done, just need some hex editor to put everything into single file and adjust bits as necessary.

Oh and another issue, which deserves separate topic is how to emulate LCDOUT statement, because it can't send $FE to display

[CuriousOne]

Not exact match, but HxD hex editor does the job almost in the way I see it.

[richard]

The issue with Mikroe "creation" is it, as everything else done by them, is written with left feet- need admin priviledges to run it, and

make an icon and assign admin to it , not a problem. running in compatibility mode can help if it wont save stuff w10 is ok without it

it outputs fonts rotated by 90 degrees

glcd mode is data by column, tft mode is data by row , there is no problem
you need to massage the data a little for pbp but its no big deal

[CuriousOne]

I don't see any mode selector in GLCD font creator from their website.

[richard]

don't think you looked too hard