OSWORD &FC (252) - DOS CRTC Control 80x86 DOS
The control block is ignored, so for speed, set XY?0=0 and XY?1=0. Commands are sent from the 80x86 via Tube register 2: b7=0 - program CRTC, command specifies register, next byte sent through register 2 is the CRTC data. &FC - write to mouse port (does nothing) &FD - intercept events &FE - initialise mouse driver &FF - finish. All other commands finish the transaction.
Jgharston 14:28, 26 May 2009 (UTC)