|
| Interrups | Categories | Contents |
AX = 4330h
Return:
AL = 80h if external A20 handler provided ES:BX -> external A20 handler (see #02790) CL = A20 detection support 00h handler is unable to report A20 state 01h handler supports function 0002h to report A20 state
Note: HIMEM.SYS calls this function to allow an external program to provide an A20 handler (i.e. to support a machine not supported by HIMEM itself)
(Table 02790) Call parameters for external A20 handler are:. AX = function 0000h disable A20 0001h enable A20 0002h get A20 state
Return:
AX = status (functions 0000h and 0001h) 0000h failure 0001h successful AX = A20 state (function 0002h) 0000h disabled 0001h enabled
Note: HIMEM.SYS only calls function 0002h if the returned CL indicated that the handler supports the call
Category: Memory Management - Int 2Fh - H
|
| Interrups | Categories | Contents |