/usr/share/z88dk/lib/serintfc.def is in z88dk-data 1.8.ds1-10.
This file is owned by root:root, with mode 0o644.
The actual contents of the file can be viewed below.
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; Standard Z88 Operating System manifests:
; The information below is defined in Developers Notes, release 3.00
; (c) Cambridge Computer 1989
; Low level serial port interface:
DEFC Os_Si = $8D ; serial interface (low level)
DEFC SI_HRD = $00 ; Hard reset the serial port
DEFC SI_SFT = $03 ; Soft reset the serial port
DEFC SI_INT = $06 ; Interrupt entry point
DEFC SI_GBT = $09 ; Get byte from serial port
DEFC SI_PBT = $0C ; Put byte to serial port
DEFC SI_ENQ = $0F ; Status enquiry
DEFC SI_FTX = $12 ; Flush Tx (transmit) buffer
DEFC SI_FRX = $15 ; Flush Rx (receive) buffer
DEFC SI_TMO = $18 ; Set timeout
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