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| Boot | Terminate | System Info |

Boot

Warm Boot (~ Ctrl-Alt-Del)

BOOT.COM (Wolverton,Gookin: Supercharging MS-DOS, p.190)

MOV AX,40 MOV DS,AX MOV AX,1234 ;Reset flag at 40:72, bypass mem test MOV [72],AX JMP F000:E05B ;BIOS boot routine

WARM.COM (Somerson: DOS 5 Power Tools, p.101) - safer!

B8 4000 MOV AX,0040 E8 D8 MOV DS,AX B8 3412 MOV AX,1234 ;warm boot flag A3 7200 MOV [0072],AX EA 0000 FFFF JMP FFFF:0000 ;at FFFF:0000 : JMP F000:E05B

 

Cold Boot (~ Reset)

COLD.COM (Somerson: DOS 5 Power Tools, p.101)

B8 4000 MOV AX,0040 E8 D8 MOV DS,AX B8 7F7F MOV AX,7F7F ;cold boot flag A3 7200 MOV [0072],AX EA 0000 FFFF JMP FFFF:0000 ;at FFFF:0000 : JMP F000:E05B

Terminate

INT 20

Terminate

INT 20

INT 21, 4C

Terminate and return 'errornr'in AL

mov al,0 ;return ERRORLEVEL 0 mov ah,4Ch ;End Program int 21h

System Info

Get equipment list:                 INT 11 > AX=flagbits
read current clock number:          INT 1A,0
set the clock:                      INT 1A,1
get DOS version number:             INT 21,30 > AH=minor, AL=major
get list of lists (CDS structures): INT 21,52