127 lines
4.5 KiB
NASM
127 lines
4.5 KiB
NASM
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COMMENT *
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Demo (and semi-useful) program to read/set burnout device parameters.
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Usage: burnout [ticks] [C+-] [V+-] [H+-]
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Parameters can be separated by almost anything.
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With no parameters, program simply returns current status.
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Examples:
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burnout 5000 (sets time to 5000 ticks)
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burnout 5000H+ (time=5000, use hardware blanking)
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burnout 5000,h+ (ditto, separators don't matter)
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burnout c+h-v+ (continuous clear, software, monitor video)
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burnout /C+ /H- /V+ (ditto)
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burnout (return status only)
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Assembly/link:
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masm burnout;
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link burnout; (ignore NO STACK warning message)
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exe2bin burnout burnout.com
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stdout equ 1 ; DOS output files
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stderr equ 2
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; ----- General equates
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DOS equ 21H ; DOS interrupt
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TERMINATE equ 20H ; Exit to DOS
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PRINT equ 09H ; DOS "print" string to stdout
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FOPEN equ 3D02H ; DOS file open, read/write
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FREAD equ 3FH ; DOS file read
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FWRITE equ 40H ; DOS file write
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CR equ 13 ; ASCII carriage return
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LF equ 10 ; ASCII line fine
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code segment
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assume cs:code,ds:code
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org 80H ; Parm storage area in PSP
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ParmLength label byte ; Length of parms
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org 81H
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Parameters label byte ; Start of parms
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org 100H ; Org for .COM
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main proc far
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jmp start ; Hate to execute data
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DevName db 'BRNDEV',0 ; Burnout device name
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handle dw ? ; Storage for handle
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Flush db '@' ; Char to flush device I/O
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Execute db '#' ; Char to execute device commands
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NotInstalled db 'Burnout device is not installed',13,10
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NotInstalledL equ $ - NotInstalled
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Status db 'Current status: ' ; Status message
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StatInsert db 40 dup (?) ; brndev will store status here
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; ----- Open the device
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start:
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mov dx,offset DevName ; DS:DX => device name
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mov ax,FOPEN
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int DOS
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jnc A1 ; Continue if no error
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mov bx,stderr ; Message to stderr
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mov cx,NotInstalledL
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mov dx,offset NotInstalled
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mov ah,FWRITE
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int DOS
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jmp exit
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; ----- Flush any pending I/O to/from the device
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A1:
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mov handle,ax ; Save device handle
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mov dx,offset Flush ; Point to the "@"
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mov cx,1 ; Writing one byte
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mov bx,handle ; Device handle
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mov ah,FWRITE ; Write "@" to device
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int DOS
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; ----- Send and execute parameters if present
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mov cl,ParmLength ; Parm length to CL
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or cl,cl ; Any parms present?
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jz A2 ; Skip if not
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xor ch,ch ; CX = parm length
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mov dx,offset Parameters ; DS:DX => parms
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mov bx,handle ; BX = device handle
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mov ah,FWRITE ; Write parms to device
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int DOS
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mov dx,offset Execute ; Execute the parms
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mov cx,1 ; Writing one byte
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mov bx,handle ; Device handle
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mov ah,FWRITE ; Write "#" to device
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int DOS
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; ----- Get and display device status
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A2:
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mov dx,offset StatInsert ; DS:DX => where to put status
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mov cx,0FFH ; Ask for lots of data; DOS will ...
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; ... fetch only until CR found.
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mov bx,handle ; Device handle
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mov ah,FREAD ; Read device info
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int DOS
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mov cx,ax ; CX = actual # bytes read
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mov di,offset StatInsert ; Where the stat data is stored
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add di,cx ; Add length of input read
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mov al,CR ; Store a CR/LF/'$' at end
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cld
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stosb
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mov al,LF
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stosb
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mov al,'$'
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stosb
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mov dx,offset Status ; Write status to stdout
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mov ah,PRINT
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int DOS
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exit:
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int TERMINATE ; Exit to DOS
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main endp
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code ends
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end main
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