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71 lines
2.7 KiB
71 lines
2.7 KiB
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;----------------------------------------------------------------------------;
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; Define macros
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;----------------------------------------------------------------------------;
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ShowStr MACRO str
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mov dx, offset str
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mov ah, 9
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int 21h
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ENDM
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BOP MACRO func
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db 0c4h,0c4h,func
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; jmp cs:[pass_disp_add]
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; int 44h
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ENDM
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;----------------------------------------------------------------------------;
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; Flags & Numeric Equates
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;----------------------------------------------------------------------------;
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MAX_LOW EQU 25 ; Max low count
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MAX_CUL EQU 80 ; Max culumn count
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MaxFunc EQU 1Dh ; int 10h max function No.
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MaxCmd EQU 24 ; max command code for DOS 3.2+
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cr EQU 0Dh ; carriage return
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lf EQU 0Ah ; linefeed
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eom EQU '$' ; end-of-message signal
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space EQU 20h ; ascii space
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tab EQU 09h ; ascii tab
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VECTOR_SEG EQU 0000h ; Interrupt Vector segment
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WORK_SEG EQU 0040h ; BIOS work area segment
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FULLSCREEN EQU 1
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; definition of a Request Header structure so that we can access its elements.
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; this structure is not exhaustive at all: block device use some addresses for
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; different purposes, and have data beyond the cmd_seg word.
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REQ_HEADER STRUC
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lengt DB ? ; request header length
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unit DB ? ; unit number (for Block Devs. only)
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ccode DB ? ; command code
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stat DW ? ; status word
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reserv DB 8 DUP(?) ; reserved for DOS us
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media DB ? ; Media ID (for Block Devs. only)
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xfer DW ? ; offset of data buffer
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xseg DW ? ; segment of data buffer
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cmd_off DW ? ; count of bytes in request, or
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cmd_seg DW ? ; segment of CONFIG.SYS line
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REQ_HEADER ENDS
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; values for the different 'magic numbers' used with Device Drivers
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fNEXTLINK EQU -1 ; word to tell DOS to substitute by address of
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; next device
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fCHARDEVICE EQU 8000h ; bit to define device as a character device
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fOPENCLOSE EQU 0040h ; bit to indicate that device supports open/close
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fDONE EQU 0100h ; Status Done bit meaning device is done
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fERROR EQU 8000h ; Status Error bit meaning error on operation
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fWRITE_E EQU 000Ah ; Write Fault Error bit
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fREAD_E EQU 000Bh ; Read Fault Error bit
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fUNKNOWN_E EQU 0003h ; Unknown Command Error bit
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; values for the search flags used by Write Routine
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fDELETE EQU 2
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fINSERT EQU 4
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fSEARCH EQU 8
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