文档介绍：汇编源码系列的dossym
疯狂代码/ ĵ:http://assembler/
这个都是过去DOS时代汇编源码虽然已经过去了但是对于学习汇编还是有帮助汇编语言只是员门基
础语言大多人掌握即可不定要深入研究.......
IF2
%OUT DOSSYM in Pass 2
ENDIF
IFNDEF ALTVECT
ALTVECT EQU 0 ;FALSE
ENDIF
BREAK <Control character definitions>
c_DEL EQU 7Fh ; ASCII rubout or delete previous char
c_BS EQU 08h ; ^H ASCII backspace
c_CR EQU 0Dh ; ^M ASCII carriage
c_LF EQU 0Ah ; ^J ASCII linefeed
c_ETB EQU 17h ; ^W ASCII end of transmission
c_NAK EQU 15h ; ^U ASCII negative acknowledge
c_ETX EQU 03h ; ^C ASCII end of text
c_HT EQU 09h ; ^I ASCII tab
BREAK <BPB Definition>
;----+----+----+----+----+----+----+----+----+----+----+----+----+----+----;
; ;
; C A V E A T P R O G R A M M E R ;
; ;
; Certain structures, constants and system calls below are private to ;
; the DOS and are extremely version-dependent. They may change at any ;
; time at the implementors' whim. As a result, they must not be ;
; documented to the general public. If an extreme arises, they ;
; must be documented with this warning. ;
; ;
; Those structures and constants that are subject to the above will be ;
; marked and bracketed with the flag: ;
; ;
; C A V E A T P R O G R A M M E R ;
; ;
;----+----+----+----+----+----+----+----+----+----+----+----+----+----+----;
BREAK <Bios Parameter Block>
;----+----+----+----+----+----+----+----+----+----+----+----+----+----+----;
; C A V E A T P R O G R A M M E R ;
; ;
; Bios Parameter Block definition
; This structure is used to build a full DPB
BPBLOCK STRUC
BPSECSZ DW ? ; Size in s of physical sector
BPCLUS DB ? ; Sectors/Alloc unit
BPRES DW ? ; Number of reserved sectors
T DB ? ; Number of FATs
T DW ? ; Number of directory entries
T DW ? ; Total number of sectors
BPMEDIA DB ? ; Media descriptor
BPFTSEC DW ? ; Number of sectors taken up by _disibledevent= B, ...)
;
devid_ISDEV EQU 80h
devid_EOF EQU 40h
dev