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MEDIA.ASM
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;================================================================;
; ATTRIBUTION-NONCOMMERCIAL-SHAREALIKE 4.0 INTERNATIONAL ;
; (CC BY-NC-SA 4.0) ;
;----------------------------------------------------------------;
; NAMENSNENNUNG - NICHT-KOMMERZIELL - WEITERGABE UNTER GLEICHEN ;
; BEDINGUNGEN 4.0 INTERNATIONAL (CC BY-NC-SA 4.0) ;
;================================================================;
; THOMAS BRASE, WWW.RETROCMP.DE, 05/2021 ;
;----------------------------------------------------------------;
; FILENAME MEDIA.ASM ;
;----------------------------------------------------------------;
; THIS FILE CONTAINS THE PROCEDURES FOR WRITING DRIVE MEDIA ;
; INFORMATION TO THE SCREEN: ;
; ;
; WRITE_MDS MEDIA DESPRIPTOR BYTE ;
; WRITE_BPS BYTES PER SECTOR ;
; WRITE_NCL TOTAL NUMBER OF CLUSTERS ;
; WRITE_SPC SECTORS PER CLUSTER ;
;----------------------------------------------------------------;
; USES VIDEO.ASM (PNAB) ;
; ;
; ASSEMBLER MICROSOFT MACROASSEMBLER MASM 5.10 ;
; PNAB PETER NORTON'S ASSEMBLERBUCH (ISBN 3-89090-624-9);
;----------------------------------------------------------------;
; USES INT 21 (1CH) ;
; ;
; ==> INPUT ;
; AH 1CH FUNCTION CODE ;
; DL DRIVE CODE ;
; 0 = C: ;
; 1 = A: ;
; 2 = B: ;
; <== OUTPUT ;
; AL SECTORS PER CLUSTER ;
; CX NUMBER OF BYTES PER SECTOR ;
; DX NUMBER OF CLUSTERS PER DRIVE ;
; DS:BX 'POINTER' TO MEDIA DESCRIPTOR (FAT-ID-BYTE) ;
; !!! DS IS CHANGING -> PUSH & POP !!! ;
; DS SEGMENT ;
; BX OFFSET ;
;----------------------------------------------------------------;
; 23.05.2018 CREATED ;
;================================================================;
;-----------------------------------------------------------------
; LABEL CODE SEGMENT AND DATA SEGMENT AND LINK THEM TO A 'SINGLE'
; 64 KBYTE SEGMENT WITH THE NAME 'CGROUP'. SEE PNAB, K14, S156
;-----------------------------------------------------------------
CGROUP GROUP CODE_SEG, DATA_SEG
ASSUME CS:CGROUP, DS:CGROUP
DATA_SEG SEGMENT PUBLIC
S_HEX DB 'h ', 0H
DATA_SEG ENDS
CODE_SEG SEGMENT PUBLIC
;-----------------------------------------------------------------
; EXTERNAL PROCEDURES VIDEO.ASM (PNAB)
;-----------------------------------------------------------------
EXTRN WRITE_HEX:NEAR
EXTRN WRITE_DECIMAL:NEAR
EXTRN CURSOR_RIGHT:NEAR
EXTRN WRITE_STRING:NEAR
;================================================================;
PUBLIC WRITE_MDS
;----------------------------------------------------------------;
; THIS PROCEDURE PRINTS THE MEDIA DESCRIPTOR BYTE AS A TWO-DIGIT ;
; HEX NUMBER AT THE CURRENT CURSOR POSITION. ;
; ;
; DL DRIVE NUMBER ;
; USES: WRITE_HEX ;
;----------------------------------------------------------------;
WRITE_MDS PROC NEAR
PUSH AX ; SAVE ...
PUSH BX
PUSH CX
PUSH DX
PUSH DS ; IMPORTANT!
MOV AH,1CH ; FUNCTION CODE
INT 21H
MOV DL,BYTE PTR[BX] ; 'POINTER' DS:BX TO MDS
CALL WRITE_HEX ; WRITE MDS
POP DS ; ... RESTORE
POP DX
POP CX
POP BX
POP AX
RET
WRITE_MDS ENDP
;================================================================;
;================================================================;
PUBLIC WRITE_BPS
;----------------------------------------------------------------;
; THIS PROCEDURE PRINTS THE NUMBER OF BYTES PER SECTOR AT THE ;
; CURRENT CURSOR POSITION. ;
; ;
; DL DRIVE NUMBER ;
; USES: WRITE_HEX, WRITE_DECIMAL, WRITE_STRING, ;
; CURSOR_RIGHT ;
;----------------------------------------------------------------;
WRITE_BPS PROC NEAR
PUSH AX ; SAVE ...
PUSH BX
PUSH CX
PUSH DX
PUSH DS ; IMPORTANT!
MOV AH,1CH ; FUNCTION CODE
INT 21H
MOV DX,CX ; BYTES PER SEKTOR ARE IN CX
CALL WRITE_DECIMAL ; WRITE BPS (DEZIMAL)
CALL CURSOR_RIGHT
POP DS ; RESTORE DATA SEGMENT
POP DX ; ... RESTORE THE REST
POP CX
POP BX
POP AX
RET
WRITE_BPS ENDP
;================================================================;
;================================================================;
PUBLIC WRITE_NCL
;----------------------------------------------------------------;
; THIS PROCEDURE PRINTS THE TOTAL NUMBER OF CYLINDERS OF THE ;
; DRIVE ;
; ;
; USES: WRITE_DECIMAL ;
;----------------------------------------------------------------;
WRITE_NCL PROC NEAR
PUSH AX ; SAVE ...
PUSH BX
PUSH CX
PUSH DX
PUSH DS ; IMPORTANT !
MOV AH,1CH ; FUNCTION CODE
INT 21H
; MOV DX,DX ; ALREADY IN DX !
CALL WRITE_DECIMAL ; ... WRITE NCL
POP DS ; ... RESTORE
POP DX
POP CX
POP BX
POP AX
RET
WRITE_NCL ENDP
;================================================================;
;================================================================;
PUBLIC WRITE_SPC
;----------------------------------------------------------------;
; THIS PROCEDURE PRINTS THE SECTORS PER CLUSTER ;
; ;
; USES: WRITE_DECIMAL, WRITE_HEX ;
;----------------------------------------------------------------;
WRITE_SPC PROC NEAR
PUSH AX ; SAVE ...
PUSH BX
PUSH CX
PUSH DX
PUSH DS ; IMPORTANT !
MOV AH,1CH ; FUNCTION CODE
INT 21H
MOV DL,AL ; SPC ARE IN AL
; CALL WRITE_HEX ; MAX. WERT IST 02D = 02H
XOR DH,DH ; SET TO 0
CALL WRITE_DECIMAL ; LOOKS BETTER THAN HEX
POP DS ; ... RESTORE
POP DX
POP CX
POP BX
POP AX
RET
WRITE_SPC ENDP
;================================================================;
;================================================================;
CODE_SEG ENDS
END
;================================================================;
; ATTRIBUTION-NONCOMMERCIAL-SHAREALIKE 4.0 INTERNATIONAL ;
; (CC BY-NC-SA 4.0) ;
;----------------------------------------------------------------;
; NAMENSNENNUNG - NICHT-KOMMERZIELL - WEITERGABE UNTER GLEICHEN ;
; BEDINGUNGEN 4.0 INTERNATIONAL (CC BY-NC-SA 4.0) ;
;================================================================;