Int 78

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UofSalford DBOS DOS extender - API

AH = function
00h (PB) display 32-bit memory specified by command argument
01h (PT) display 32-bit instruction(s) specified by command arg
02h specify offset to subsequent PB and PT commands
03h switch to protected mode
DWORD following INT instruction point to map; protected-mode
entry point is immediately following the DWORD

Return:
Never

Note: If bit 31 of the map address is set, only a stub was loaded by DOS and DBOS will load the entire program 04h specify that subsequent load (AH=03h) should leave program in memory 05h release program from memory 06h set break point at address and option count from commandline 07h resume program execution 08h single-step program 09h set read/write breakpoint using 386 debug registers 0Ah set write breakpoint using 386 debug register 0Bh set memory byte to new value 0Ch display CPU registers 0Dh run until specified program address reached 0Fh print trace from program map 10h specify an offset using a map symbol 14h print memory without any offset 18h switch DBOS into/out of test mode (ON/OFF commandline args) 1Dh get address of real/protected-mode communication buffer

Return:
ES:BP -> comm buffer 1Eh set real-mode memory size (specify how much real-mode memory to leave free when running FTN77 programs) 22h uninstall DBOS 24h force DBOS to emulate coprocessor instructions 26h set named DBOS switches from commandline 27h reset named DBOS switched from commandline 2Ah set list of dynamic link libraries to contents of commandline file 35h specify that subsequent load (AH=03h) should stop at first instruction

Return:
???

Notes: DBOS supports functions 00h through 50h; many of these functions provide a low-level debugging interface. Command arguments are read from the calling program's PSP

See Also: INT 79"DBOS"

Index:
Uninstall;DBOS DOS extender

Category: DOS Extenders - Int 78h - U

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