Difference between revisions of "OSBYTE &A3"

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[[Category:OSBYTE]]
 
[[Category:OSBYTE]]
==OSBYTE &A3 (163) - Application support==
+
{{PageTitle|OSBYTE &A3 (163) - Application support}}
 +
__TOC__
 
   On entry:
 
   On entry:
 
     X = application identifier
 
     X = application identifier
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         X=243 65Tube
 
         X=243 65Tube
 
         X=253 Cause a reset
 
         X=253 Cause a reset
 +
        X=254 unknown
 
         X=255 Acornsoft View family
 
         X=255 Acornsoft View family
 
     Y = parameter
 
     Y = parameter
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     Y = return value
 
     Y = return value
  
===X=&80 (128) Plus 1 Support===
+
==X=&80 (128) Plus 1 Support==
 
   On entry:
 
   On entry:
 
     Y=0 enable printer/ADC
 
     Y=0 enable printer/ADC
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       X=default language in X, b7 set if no default language
 
       X=default language in X, b7 set if no default language
  
===X=&F2 (242) Graphics Extension Support (GSX, RISC OS)===
+
==X=&F2 (242) Graphics Extension Support (GSX, RISC OS)==
 
   On entry:
 
   On entry:
 
     Y=0    resets the dot-dash pattern and length to defaults
 
     Y=0    resets the dot-dash pattern and length to defaults
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     Y=65    return status returns
 
     Y=65    return status returns
 
   On exit:
 
   On exit:
 +
    if X=Y=0 then the ROM is fitted but disabled
 
     X=b0..5 current dot dash pattern repeat length (0 means 64)
 
     X=b0..5 current dot dash pattern repeat length (0 means 64)
       b6    if set flood fill is always active
+
       b6    if set flood fill is turned on
 
       b7    if set GXR ROM is turned on
 
       b7    if set GXR ROM is turned on
 
     Y=number of pages allocated to sprites
 
     Y=number of pages allocated to sprites
 
   On entry:
 
   On entry:
     Y=66    return info on current sprite returns
+
     Y=66    return info on currently selected sprite
 
   On exit:
 
   On exit:
 +
    if X=Y=0 then the ROM is fitted but disabled, or no sprite is selected
 
     X=pixel width  
 
     X=pixel width  
 
     Y=pixel height
 
     Y=pixel height
    if X=Y=0 then the ROM is not fitted, or no sprite is selected
 
  
===X=&F3 (243) 65Tube emulator===
+
If the GXR ROM is absent, the call returns X=&FF and Y preserved. A call to OSBYTE &A3,242,65
 +
can determine if GSX is absent, present but disabled, or present and enabled:
 +
 
 +
  On entry: A=&A3, X=242, Y=65
 +
  On exit:  Y=65 - GSX ROM absent (Y preserved if ROM is absent)
 +
            Y<64 - GSX ROM is present (not possible to have more
 +
                  than 64 pages of workspace)
 +
                  X.b7=0 - GSX ROM disabled
 +
                  X.b7=1 - GSX ROM enabled
 +
 
 +
==X=&F3 (243) 65Tube emulator==
 
   On entry:
 
   On entry:
 
     Y=4    find code address
 
     Y=4    find code address
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     Called on Tube reset to ask for any startup command.
 
     Called on Tube reset to ask for any startup command.
  
===X=&FD (253) Cause a Reset===
+
==X=&FD (253) Cause a Reset==
 
   On entry:
 
   On entry:
 
     Y=[[OSBYTE &FD]] reset type:
 
     Y=[[OSBYTE &FD]] reset type:
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   See also [[Reset from software]].
 
   See also [[Reset from software]].
  
===X=&FF (255) Acornsoft View family workspace flag===
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==X=&FE (254) Unknown==
 +
  This call is checked for by 65Tube.
 +
  On entry:
 +
    Y=unknown
 +
  On exit:
 +
    On 65Tube, X and Y returned preserved.
 +
 
 +
==X=&FF (255) Acornsoft View family workspace flag==
 
   On entry:
 
   On entry:
 
     Y<&80  read ROM's workspace byte at &DF0+romnum
 
     Y<&80  read ROM's workspace byte at &DF0+romnum
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     Some versions of ViewSheet and ViewSpell do not implement the
 
     Some versions of ViewSheet and ViewSpell do not implement the
     call to set the workspace byte.
+
     call to set the workspace byte. On 65Tube, X and Y are returned
 +
    preserved.
  
 
==See Also==
 
==See Also==

Latest revision as of 11:19, 26 January 2021

OSBYTE &A3 (163) - Application support
 On entry:
   X = application identifier
       X=128 Electron Plus 1
       X=242 Graphics Extension Support
       X=243 65Tube
       X=253 Cause a reset
       X=254 unknown
       X=255 Acornsoft View family
   Y = parameter
 On exit:
   X = return value
   Y = return value

X=&80 (128) Plus 1 Support

 On entry:
   Y=0 enable printer/ADC
   Y=1 disable printer/ADC
   Y=2 enable serial port
   Y=3 disable serial port
   Y=4 restore ROM table
 On exit:
   If Y<4 on entry,
     X=0 if enabled, X<>0 if disabled
   If Y=4 on entry,
     X=default language in X, b7 set if no default language

X=&F2 (242) Graphics Extension Support (GSX, RISC OS)

 On entry:
   Y=0     resets the dot-dash pattern and length to defaults
   Y=1..64 set dot dash pattern repeat length
 On entry:
   Y=65    return status returns
 On exit:
   if X=Y=0 then the ROM is fitted but disabled
   X=b0..5 current dot dash pattern repeat length (0 means 64)
     b6    if set flood fill is turned on
     b7    if set GXR ROM is turned on
   Y=number of pages allocated to sprites
 On entry:
   Y=66    return info on currently selected sprite
 On exit:
   if X=Y=0 then the ROM is fitted but disabled, or no sprite is selected
   X=pixel width 
   Y=pixel height

If the GXR ROM is absent, the call returns X=&FF and Y preserved. A call to OSBYTE &A3,242,65 can determine if GSX is absent, present but disabled, or present and enabled:

 On entry: A=&A3, X=242, Y=65
 On exit:  Y=65 - GSX ROM absent (Y preserved if ROM is absent)
           Y<64 - GSX ROM is present (not possible to have more
                  than 64 pages of workspace)
                  X.b7=0 - GSX ROM disabled
                  X.b7=1 - GSX ROM enabled

X=&F3 (243) 65Tube emulator

 On entry:
   Y=4     find code address
 On exit:
   if Y<>0, XY=address to jump to
   Called on Tube reset, *BASIC and NMIs to ask for any code entry address.
 On entry:
   Y=6     find *command to execute
 On exit:
   if Y<>0, XY=>*command to execute
   Called on Tube reset to ask for any startup command.

X=&FD (253) Cause a Reset

 On entry:
   Y=OSBYTE &FD reset type:
     0 = Soft Reset (Break)
     1 = Power-On Reset
     2 = Hard Reset (Ctrl-Break)
 On exit:
   Will only exit if the call is not implemented.
 
 Implemented by RSTROM and other ROMs.
 See also Reset from software.

X=&FE (254) Unknown

 This call is checked for by 65Tube.
 On entry:
   Y=unknown
 On exit:
   On 65Tube, X and Y returned preserved.

X=&FF (255) Acornsoft View family workspace flag

 On entry:
   Y<&80   read ROM's workspace byte at &DF0+romnum
   Y>&7F   set ROM's workspace byte at &DF0+romnum to &80
   
   Y=&01/&81 read/set View's ROM workspace byte
   Y=&02/&82 read/set ViewSheet's ROM workspace byte
   Y=&03/&83 read/set ViewStore's ROM workspace byte
   Y=&04/&84 read/set ViewSpell's ROM workspace byte
 On exit:
   X=ROM's workspace byte at &DF0+romnum
   
   Some versions of ViewSheet and ViewSpell do not implement the
   call to set the workspace byte. On 65Tube, X and Y are returned
   preserved.

See Also

Jgharston 22:16, 26 May 2009 (UTC) Jgharston (talk) 02:26, 24 November 2020 (CET)