The instruction is present in the keyboard routine of INT 9 and is triggered by the key combination Left-PrtSc with interrupts enabled. Execution sends the entire contents of the display buffer to the printer, giving a hard copy of the CRT display. ... a system reset, the eight switches of SW1 are read from port A of the PPI, and data are read from communications and ... The interrupt B-B BIOS INTERRUPTS S41.
|Author||:||Charles Asbury Holt|
|Publisher||:||Macmillan Pub Co - 1986-01|