Z86129 Datasheet, PDF (26/50 Pages) Zilog, Inc. – NTSC LINE 21 DECIDER

Z86129/130/131
NTSC Line 21 Decoder
PRELIMINARY
COMMANDS (Continued)
Table 12. Two-Byte OSD Display Mode Commands (Z86129 Only)
Command
Name
POP ROW
SEL
(with Double
High Option)
PHYS ROW
SEL
CURSOR SET
First
Byte
A0h
A1h
A2h
WRITE CHAR A3h
WRITE MAP A4h
WRITE CHAR A5h
DBL WIDE
WAIT
A6h
Second
Byte
rrh
rrh
cch
ddh
rrh
ddh
Command Function
Sets display row and moves cursor to char column 1. The low order nibble of rr
designates the display row. Bit 5 of rr specifies a Double High row. For example:
rr = 0Eh would select display row 14. rr = 23h would select display row three,
Double High.
Sets the physical row, where the low order nibble of rr designates the physical
row. rr can be any value from 00h to 0Fh.
Places the cursor at the character column position designated by cc, which can be
any value from 00h to 20h (column 0-32). Zero is the PAC space.
Writes the data byte dd to the current cursor location and then increments the
cursor.
Maps the current physical row to the display row designated by the low nibble of
the rr byte. Bit 4 of rr = 1 enables display of the row. Bit 5 of rr = 1 indicates a
double High row.
Same as A3 command but specifies a double wide character.
nnh Sets the RDY bit of SS and then suspends serial command execution for
approximately the number of frames designated by the nn byte.
Figure 17 shows the two different character sets, Graphics
or Extended, that share the address space C0h-FFh. The
Graphics Character set is in force when the OSD display
is in Drop Shadow mode (the default condition).
The two-byte commands GRAPHICS and EXTENDED
above can be used to switch from the Graphics Characters
to the Extended Characters and vice versa. An OSD
screen can only use one set at a time.
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