Difference between revisions of "OSBYTE &19"
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[[Category:OSBYTE]] | [[Category:OSBYTE]] | ||
| − | OSBYTE &19 (25) - Reset a group of font definitions | + | __TOC__ |
| − | + | OSBYTE &19 (25) - Reset a group of font definitions | |
| + | On entry: | ||
X=0 resets 32-255 | X=0 resets 32-255 | ||
X=1 resets 32-63 | X=1 resets 32-63 | ||
| Line 10: | Line 11: | ||
X=6 resets 192-223 | X=6 resets 192-223 | ||
X=7 resets 224-255 | X=7 resets 224-255 | ||
| + | On exit: | ||
| + | X=&FF: OSBYTE &19 unsupported | ||
| + | X=preserved: subcall unsupported | ||
| + | X=&00: subcall actioned | ||
| − | &19 (Watford Speech | + | 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=== | ||
| + | IFFNbyte(25,0,0):FORB%=1TO6:A%=FNbyte(20,B%,0):NEXT | ||
| + | |||
| + | 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 | ||
| + | LDX #6 :\ loop through 'explode font' calls | ||
| + | .resetLoop | ||
| + | TXA:PHA :\ save current font block | ||
| + | LDA #20:JSR OSBYTE :\ explode block X | ||
| + | PLA:TAX :\ get block number back | ||
| + | DEX:BNE resetLoop :\ loop until X=0 | ||
| + | .resetDone | ||
==See Also== | ==See Also== | ||
| + | * [[OSBYTE &14]] explode fonts | ||
* http://mdfs.net/Docs/Comp/BBC/Osbyte00 | * http://mdfs.net/Docs/Comp/BBC/Osbyte00 | ||
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| − | |||
Revision as of 14:43, 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
IFFNbyte(25,0,0):FORB%=1TO6:A%=FNbyte(20,B%,0):NEXT
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
LDX #6 :\ loop through 'explode font' calls
.resetLoop
TXA:PHA :\ save current font block
LDA #20:JSR OSBYTE :\ explode block X
PLA:TAX :\ get block number back
DEX:BNE resetLoop :\ loop until X=0
.resetDone
See Also
- OSBYTE &14 explode fonts
- http://mdfs.net/Docs/Comp/BBC/Osbyte00
