AUS KRAUSE.001 BFDC.ASM - BFDC.PRN aktuell assembliert mit YAZE
                
                ;	FLOPPY DRIVER MODULE FOR CPM 3.0
                ;	BANKED VERSION 08/23/83
 
MACRO:

Krauseformat: 
Hier werden 192 Directory Eintraege vorgegeben




DPB1  	DPB	512,15, 77,2048,192,2	; 8" 77 TRK SS DD
DPB2    DPB	512,15,154,2048,192,2	; 8" 77 TRK DS DD
---AL0 = E0 = 3 Bloecke---------^^^


Aus der Macrovorgabe erstellte DPB:
              
    DPB1  	DPB	512,15,77,2048,192,2	; 8" 77 TRK SS DD

    3C00      	DW	0021		; 128 BYTE RECORDS PER TRACK
    040F      	DB	0022,0023	; BLOCK SHIFT AND MASK
    00        	DB	0024		; EXTENT MASK
    1801      	DW	0025		; MAXIMUM BLOCK NUMBER
    BF00      	DW	0026		; MAXIMUM DIRECTORY ENTRY NUMBER 191+1
--> E000 <--  	DB	0027,0028	; ALLOC VECTOR FOR DIRECTORY
    3000      	DW	0029		; CHECKSUM SIZE
    0200      	DW	2		; OFFSET FOR SYSTEM TRACKS
    0203      	DB	0030,0031	; PHYSICAL SECTOR SIZE SHIFT
              
     DPB2    DPB	512,15,154,2048,192,2	; 8" 77 TRK DS DD

    3C00      	DW	0033		; 128 BYTE RECORDS PER TRACK
    040F      	DB	0034,0035	; BLOCK SHIFT AND MASK
    00        	DB	0036		; EXTENT MASK
    3902      	DW	0037		; MAXIMUM BLOCK NUMBER
    BF00      	DW	0038		; MAXIMUM DIRECTORY ENTRY NUMBER 191+1
--> E000 <--  	DB	0039,0040	; ALLOC VECTOR FOR DIRECTORY
    3000      	DW	0041		; CHECKSUM SIZE
    0200      	DW	2		; OFFSET FOR SYSTEM TRACKS
    0203      	DB	0042,0043	; PHYSICAL SECTOR SIZE SHIFT
 
 
Aus dem CP/M System Guide

The form of the DPB macro call is

where:

label: DPB ?psi ze,?pspt,?trks,?bls,?ndirs,?off[,?ncks]

psize   is the physical sector size in bytes;
pspt    is the number of physical sectors per track;
trks    is the number of tracks on the drive;
bls     is the allocation unit size in bytes;
ndirs   is the number of directory entries;
off     is the number of tracks to reserve;
ncks    is the number of checked directory entries.


The following example shows the parameters for a standard 
single-density disk drive:

DPB$SD: DPB 128,26,77,1024,64,2 
             |   |  |   |   | |off - Anzahl der reserv. Spuren - Systemtacks
             |   |  |   |   |ndirs - Anzahl der Directoryeintraege
             |   |  |   |bls - Für das Directory vorgesehene Platz
             |   |  |trks - Anzahl der Spuren auf der Diskette
             |   |pspt - Anzahl phys. Sektor pro Spur 
             |psize - Sektotgröße