The KR580 printer accumulates bytes sent by a program to port `04h` with `OUT`.
**Buffer window**
- Opens from the printer chip in Quick Access
- Shows a HEX dump by default, with offsets and 16 bytes per line
- The text-symbol button toggles between HEX and CP866-decoded text
- Can detach into a separate always-on-top window
- Clear removes the accumulated bytes
- Print to PDF saves CP866-decoded text without clearing the buffer