Atari ST series Technical Reference Manual page 330

This table contains the final 12 words of information returned
by the VDI function v__opnwk(). Three words of storage are
reserved at the end of the table, making it 15 words in
length. See COMPUTEI's Technical Reference Guide, Atari ST
Volume One: The VDI to read more about the information re­
turned by v__opnwk().
- 468 to - 467
This area is reserved for internal use.
- 466 to - 466
This area is reserved for internal use.
-4 6 4 to -4 6 1
This variable contains the address of the current VDI virtual
workstation attribute table.
-4 6 0 to -4 5 7
A pointer to the default font header is stored here.
-4 5 6 to -4 4 1
This is a longword array containing four pointers to font
headers, the last is which is a null (0) entry. Each of these
headers is a actually a linked list, since the last field in a font
header is a pointer to the next font header in the list. When
the VDI searches for a font, it starts with the header pointed
to by FONT__RING[0], and searches through that linked list.
When it comes to the end of that list, it continues with the
linked list pointed to by FONT__RING[1], and then the
linked list pointed to by FONT__RING[2]. The first two en­
tries in FONT__RING are reserved for pointers to system
font headers, while FONT__RING[2] is used for a linked list
of disk-loaded GDOS fonts.
322
APPENDIX H
SIZ__TAB
RESERVED
RESERVED
CUR__WORK
DEF__FONT
FONT__RING
( - $1D4 to - $1D3)
( - $1D2 to - $1D1)
( — $1D0 to -$1CD )
(-$ 1 C C to - $1C9)
( — $1C8 to -$1B 9)