Difference between revisions of "OSWORD &FC"

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[[Category:OSWORD]]
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[[Category:OSWORD]][[Category:Second Processors]]__NOTOC__
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OSWORD &FC (252) - DOS CRTC Control 80x86 DOS
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{{PageTitle|OSWORD &FC (252) DOS CRTC Control}}
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This OSWORD call is installed by the 80x86 DOS BIOS.
  
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The control block is ignored, so for speed, set XY?0=0 and XY?1=0.
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Commands are sent from the 80x86 via Tube Register 2 within the OSWORD protocol,
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Commands are sent from the 80x86 via Tube register 2:
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so cannot be called through the normal OSWORD mechanism. The transaction must be
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b7=0 - program CRTC, command specifies register, next byte sent
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done manually by the client by sending through Tube Register 2:
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    through register 2 is the CRTC data.
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    &08 : Start OSWORD transaction
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&FC - write to mouse port (does nothing)
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    &FD : OSWORD call &FD
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&FD - intercept events
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    &00 : TxLen=0
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&FE - initialise mouse driver
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    xxx : Send a series of commands
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&FF - finish. All other commands finish the transaction.
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    &00 : RxLen=0, terminate the OSWORD call
  
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==See Also==
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===Commands===
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* http://mdfs.net/Docs/Comp/BBC/Oswords
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* b7=0 : program CRTC, command specifies register, next byte sent is the CRTC data
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* &FC : write to mouse port (unimplemented)
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* &FD : initialise event handler
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* &FE : initialise mouse driver
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* &FF : finish. All other commands also finish the transaction.
  
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==See also==
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* [http://mdfs.net/Software/Tube/Utils/ OSWORD &FC source code]
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* [http://mdfs.net/Docs/Comp/BBC/Oswords OSWORDs list at mdfs.net]
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{{TubeOSWORD}}
 
[[User:Jgharston|Jgharston]] 14:28, 26 May 2009 (UTC)
 
[[User:Jgharston|Jgharston]] 14:28, 26 May 2009 (UTC)
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[[User:Jgharston|Jgharston]] ([[User talk:Jgharston|talk]]) 10:55, 17 December 2024 (CET)

Latest revision as of 11:45, 17 December 2024

OSWORD &FC (252) DOS CRTC Control

This OSWORD call is installed by the 80x86 DOS BIOS.

Commands are sent from the 80x86 via Tube Register 2 within the OSWORD protocol, so cannot be called through the normal OSWORD mechanism. The transaction must be done manually by the client by sending through Tube Register 2: 

   &08 : Start OSWORD transaction
   &FD : OSWORD call &FD
   &00 : TxLen=0
   xxx : Send a series of commands
   &00 : RxLen=0, terminate the OSWORD call

Commands

  • b7=0 : program CRTC, command specifies register, next byte sent is the CRTC data
  • &FC : write to mouse port (unimplemented)
  • &FD : initialise event handler
  • &FE : initialise mouse driver
  • &FF : finish. All other commands also finish the transaction.

See also

Tube OSWORD calls

Jgharston 14:28, 26 May 2009 (UTC) Jgharston (talk) 10:55, 17 December 2024 (CET)

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