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2026-06-16 15:59:24 +00:00 · 2021-01-12 17:38:47 -06:00
parent 99a7802ac0
commit 06c1f4dfdd
97 changed files with 48423 additions and 0 deletions
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+; Boot Record Program (C) Copyright Peter Norton 1986
+; From PC Magazine ca. January 1986
+
+boots segment 'code'
+
+      public boot
+
+      assume cs:boots
+
+boot  proc   far
+
+;  30-byte DOS info -- set up for 2-sides, 9-sector
+;  change as needed for any other format
+
+head:
+      jmp    begin      ; EB 2A 90 as per normal
+      db     ' DE 1.0 ' ; 8-byte system id
+      dw     512        ; sector size in bytes
+      db     2          ; sectors per cluster
+      dw     1          ; reserved clusters
+      db     2          ; number of fats
+      dw     112        ; root directory entries
+      dw     760        ; total sectors
+      db     0FDh       ; format id
+      dw     2          ; sectors per fat
+      dw     9          ; sectors per track
+      dw     2          ; sides
+      dw     0          ; special hidden sectors
+
+; mysterious but apparently standard 14-byte filler
+      db     14 dup (0)
+
+; carry on with the boot work
+
+begin:
+      mov    ax,07C0h   ; boot record location
+      push   ax
+      pop    ds
+      mov    bx,message_offset  ; put offset to message into si
+      mov    cx,message_length  ; message length from cx
+continue:
+      mov    ah,14      ; write teletype
+      mov    al,[bx]
+      push   ds
+      push   cx
+      push   bx
+      int    10h
+      pop    bx
+      pop    cx
+      pop    ds
+      inc    bx
+      loop   continue
+
+      mov    ah,0       ; read next keyboard character
+      int    16h
+
+      mov    ah,15      ; get video mode
+      int    10h
+      mov    ah,0       ; set video mode (clears screen)
+      int    10h
+
+      int    19h        ; re-boot
+
+beg_message:
+      db     0Dh,0Ah    ; carriage return, line-feed
+      db     0Dh,0Ah
+      db     0Dh,0Ah
+      db     0Dh,0Ah
+      db     '     Start your computer with'
+      db     0Dh,0Ah
+      db     '     a DOS system diskette.'
+      db     0Dh,0Ah
+      db     0Dh,0Ah
+      db     0Dh,0Ah
+      db     '     This is'
+      db     0Dh,0Ah
+      db     '        The Norton Utilities'
+      db     0Dh,0Ah
+      db     '            Version 3.0'
+      db     0Dh,0Ah
+      db     '     from'
+      db     0Dh,0Ah
+      db     '         Peter Norton'
+      db     0Dh,0Ah
+      db     '         2210 Wilshire Blvd'
+      db     0Dh,0Ah
+      db     '         Santa Monica, CA 90403'
+      db     0Dh,0Ah
+      db     0Dh,0Ah
+      db     '           (213) 826-8092'
+      db     0Dh,0Ah
+      db     0Dh,0Ah
+      db     0Dh,0Ah
+      db     0Dh,0Ah
+      db     '    Insert a DOS diskette'
+      db     0Dh,0Ah
+      db     '    Press any key to start DOS ... '
+end_message:
+
+; I put a copyright notice here; you do if you want to ...
+tail:
+
+message_offset equ beg_message - head
+message_length equ end_message - beg_message
+filler_amount  equ 512 - (tail - head) - 2
+
+      db     filler_amount dup (0)      ; filler
+
+      db     055h,0AAh                  ; boot id
+
+boot  endp
+
+boots ends
+
+      end
+