INT 7F - IBMInternational Busiuness MachinesInternational Busiuness Machines) A hardware, software and other service technology company founded in 1911. 8516 Touch Screen Device DriverAn interface module between the device-independent portions of the operating system and an actual hardware device which converts device-independent requests into the actual sequence of device operations to perform the requested action. IO.SYS contains the standard, built-in MSDOS device drivers such as CON, COM1, AUX, PRN, etc. See also INT 21h Function 52h and INT 2Fh Function 0802h. - GET 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. ENTRY AX = ABCDh BX = 0000h Return: AX = total number of functions available ES:BX -> entry point array (see #03967) SeeAlso: AX=0104h,AX=0105h (Table 03967) Values for 8516 Touch Screen function number: 00h check initialization and reset (see #03968) 14h set user-defined subroutine (see #03969) Notes: each driver function takes two stack parameters using Pascal calling conventions: address of parameter block and address of results buffer all pointers are FAR pointers on return, AX contains the status of the call: AX = 0000h successful 0001h invalid input 0002h interface error 0003h unable to perform function Format of 8516 Touch Screen Function 00h parameter block: Offset Size Description (Table 03968) 00h WORD 0000h (function number) Note: this function should be called before any other device driver functions Format of 8516 Touch Screen Function 00h results buffer: Offset Size Description (Table 03969) 00h WORD touch screen status 0000h unavailable 0001h uncalibrated FFFFh available 02h WORD aux mouse status (0000h not present, FFFFh present) Notes: the following driver parameters will have been reset to zero: touchdown counter, liftoff counter, position at last touch, position at last lift, int call mask, select on count, select off count, pos select on count, pos select off count. the following driver parameters will have been reset as listed: mouse emulation mode: left on thresholds: 46 on screen, 96 push harder, 80 push release x, y hysteresis: 400 data repeat rate: 40/sec select mechanism: push-harder - first-touch coordinate origin: upper left corner filter frequency: medium data block mask: all enabled click lock: on