/usr/share/z88dk/lib/screen.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
; Screen control:
DEFC Os_Off = $EC06 ; switch machine (screen) off
DEFC Os_Sci = $D406 ; alter screen info
; arguments:
DEFC SC_LR0 = $01 ; LORES0 (512 byte granularity)
DEFC SC_LR1 = $02 ; LORES1 (4K granularity)
DEFC SC_HR0 = $03 ; HIRES0 (8K granularity)
DEFC SC_HR1 = $04 ; HIRES1 (2K granularity)
DEFC SC_SBR = $05 ; screen base (2K granularity)
lston
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