Difference between revisions of "OSBYTE &19"
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===BASIC=== | ===BASIC=== | ||
| − | + | IF FNbyte(25,0,0) THEN A%=FNbyte(20,6,0) | |
| + | or | ||
| + | IF FNbyte(25,0,0) THEN *FX20,6 | ||
using the following function to call OSBYTE: | using the following function to call OSBYTE: | ||
| Line 36: | Line 38: | ||
LDA #25:LDX #0:JSR OSBYTE :\ try 'reset all font' | LDA #25:LDX #0:JSR OSBYTE :\ try 'reset all font' | ||
TXA:BEQ resetDone :\ X=0 if done | TXA:BEQ resetDone :\ X=0 if done | ||
| − | + | LDA #6:LDX #6:JSR OSBYTE :\ 'explode full font' | |
| − | |||
| − | |||
| − | |||
| − | |||
| − | |||
.resetDone | .resetDone | ||
Revision as of 15:15, 31 August 2015
Contents
OSBYTE &19 (25) - Reset a group of font definitions On entry: X=0 resets 32-255 X=1 resets 32-63 X=2 resets 64-95 X=3 resets 96-127 X=4 resets 128-159 X=5 resets 160-191 X=6 resets 192-223 X=7 resets 224-255 On exit: X=&FF: OSBYTE &19 unsupported X=preserved: subcall unsupported X=&00: subcall actioned
OSBYTE &19 (25) - Watford Speech: Output a speech allophone On entry: Y=0 X=allophone number - output allophone Y=1 X=word number - output a word from dictionary 1 Y=2 X=word number - output a word from dictionary 1 Y=3 X=word number - output a word from dictionary 1 Y>3 - ignored, allowing other ROMs to respond to and pass to OSBYTE &19,x,0
Example code
On MOS 3 and later the font is always exploded, on earlier MOSs (Electron, BBC, BBC B+) OSBYTE &19 does not exist, OSBYTE &14 explodes the font and resets it. The following code will reset the whole font regardless of what machine the code is running on.
BASIC
IF FNbyte(25,0,0) THEN A%=FNbyte(20,6,0)
or
IF FNbyte(25,0,0) THEN *FX20,6
using the following function to call OSBYTE:
DEFFNbyte(A%,X%,Y%)=((USR&FFF4)AND&FF00)DIV256
6502
LDA #25:LDX #0:JSR OSBYTE :\ try 'reset all font'
TXA:BEQ resetDone :\ X=0 if done
LDA #6:LDX #6:JSR OSBYTE :\ 'explode full font'
.resetDone
See Also
- OSBYTE &14 explode fonts
- http://mdfs.net/Docs/Comp/BBC/Osbyte00
