INT FF - PCIBM PC/FORTH - GRAPHICS API(Application Program[ming] Interface) The defined set of calls which a program may make to interact with or request services of the operating system or environment under which it is running. Because the inputs and outputs of the calls are well-defined, a program using the API can continue using the identical calls even if the internal organization of the program providing the API changes. - VIDEO STATUS CHANGE BX = 0000h DS:SI -> FORTH program counter SS:BP -> FORTH parameter stack SS:SP -> FORTH return stack DS:DX -> FORTH video parameter area Desc: called to inform graphics driver of any status changes such as video mode changes, character color changes, graphics XOR mode turned on or off, etc.; also used as an installation check Index: installation check;PCIBM PC/FORTH